40m efhw counterpoise length

Jun 16, 2022 · Efhw Balun 4 m) of antenna wire (i 1:49 49:1 EFHW Installation of the 9:1 balun/unun: The antenna system consists of a 40-10 EFHW (~60' Wire matched to a QRPGuys EFHW transformer mounted on a DIY wire winder cut from a yard sign), 5 aluminum tent pegs, 2 pieces of shock or bungee cord for tying off the antenna ends, a 25' BNC terminated RG-174 ... Efhw Balun 4 m) of antenna wire (i 1:49 49:1 EFHW Installation of the 9:1 balun/unun: The antenna system consists of a 40-10 EFHW (~60' Wire matched to a QRPGuys EFHW transformer mounted on a DIY wire winder cut from a yard sign), 5 aluminum tent pegs, 2 pieces of shock or bungee cord for tying off the antenna ends, a 25' BNC terminated RG-174 ...The Bandspringer Midi should work on 40m, 30m and 20m with any tuner capable of tuning a random wire / long wire antenna. It will work effectively on all bands from 60-10m with most such tuners, but not necessarily all. If you want to support your Bandspringer on a pole, we recommend our 7m SOTAPOLE. Any pole between 5m and 7m will be fine.Minimal ground system or counterpoise needed - the coax feed itself can act as a counterpoise Resonant on 80/40/30/20/17/15/12/10m with low VSWR. No tuner needed or just a 3:1 "Touch-up" tuner One simple length adjustment - no interactions between bands. Grounded at D.C. No static buildup. Shortened versions possible for limited area 3Dec 7, 2016 - End Fed Antenna EFHW. Wait !!! My time resources are limited. Windcamp For Gipsy Shortwave Antenna 1:1 Balun 3-55MHz 100W PEP Waterproof. 95 Special Order : MFJ1984MP : MFJ MFJ1984MP: 40-10 METER 300 WATT RESTRICTED SPACE EFHW ANTENNA $60. a EFHW), antenna impedance is in the 2000-4000 ohms range.The 40m EFHW is physically broken into 3 sections via two insulators inserted so that the first (when viewed from the tuner end of the wire) isolates a 20m EFHW, the next section when added on via a jumper (I use alligator clips and spade lugs) is resonant on 30m ... length short counterpoise wire for each band. It works like a charm and doesn ...Product description. This is an End-Fed Half-Wave (EFHW*) antenna for 40/20/15 and 10m bands. Unlike many END FED antennas on the market, this one does not require the Antenna Tuner to operate. It is a resonant Half wave on 40m (7MHz) therefore also resonant on second, third and fourth harmonics, 20m (14MHz), 15m (21MHz) and 10m (28MHz).Length of counterpoise should be approx. 20-30 feet but NOT resonant. If possible, run the counterpoise away from or perpendicular to the antenna wire. You can also use the unun with no counterpoise or ground if your feedline is at least 25+ feet long. In this configuration, the coax shield will act as your counterpoise. Typically, performance ...End-fed half wave antennas are best for temporary antennas using low power and batteries, far from power mains and noise sources. They are more prone for problems near noise sources or consumer gear, and can easily exceed FCC RF exposure limits with surprising low power levels. KL7JR 10-40m HEARC matchbox antenna ready to go up.In order to use our antenna calculator, you'll need to know the frequency on which you want your antenna to operate.. Your result will consist of: Your total antenna length (L);; Length of one arm of the antenna (l); and; Wavelength, as well as its portions: 1/2, 1/4 (it'll also allow you to use it as a 1/2 wave dipole calculator).; In the advanced mode:. You may enter the diameter of your ...Base Antenna, Portable, HF, 160-6 meters, 1.8-54 MHz, 500 W SSB, 60 ft. Length, PL-259, Each See More Specifications. CHAMELEON ANTENNA EMCOMM-II - CHAMELEON ANTENNA Portable HF Antennas CHA-EMCOMM-II. 4.75 out of 5 stars. Part Number: CHA-EMCOMM-II. Estimated Ship Date: Tomorrow. $129.99. Recommended Parts.2019-05-25 The paragraphs below describe the 35 ft version of the random wire antenna I am now using based on the QRPGuys 40m-10m UnUnTenna. Right on the PC board for this antenna as well as in the instructions it says suggests three lengths for the radiator: 41 ft, 35.5 ft and 29 ft.I found EFHW to be less picky about counterpoise length and terrain, plus I don't need a tuner. eladner65 liked. Reply Quote Jed Baer (@kd0ymg) Eminent Member Trial. Joined: 4 months ago. ... A 65' EFHW is resonant on 40M. The 2nd harmonic would cover 20M, 3rd 15M, and 4th, 10M. That makes perfect sense. eladner65 liked. Reply Quote eladner65 ...There is some scope for experimentation with length vs height. So long as the overall length of each quarter-wave ele-ment remains intact, (vertical + horizontal extension) the base operating frequencies should not be seriously affected. Remember that unlike a horizontal antenna, longer does NOT mean better. A longer / lower antenna reduces ... important to use a counterpoise. A standard recommendation (see QST, March 1936, p. 32, "An Unorthodox Antenna") is an 84' long end fed and a 17' long counterpoise (6.5' for 20m). Random Wire Antenna Lengths The ALLBANDKWJR is 74 ft. in length and operates on five bands, 80-10 meters. The 64 ft. EF-40-10-KW operates on four bands. All threeThe length, if it *is* effective depends on if it's elevated or laying on the ground. Whenever you lay your radials (counterpoise) on the ground, they get detuned and incur increased ground losses so the length does not really matter that much. Something close to a quarter wave is fine but not critical. ZMF-1984LP. $56.99. Add to Cart. Overview. MFJ-1984LP EndFed 1/2 Wave 30W 40M-10M Wire Antenna 66 feet. FULL HF Coverage, no tuner needed on most frequencies. No long counterpoise, radials or feedline required. Rugged weather-resistant 50-Ohm matching network. Fast Setup and takedown.I think you are using Tom's 5% shift from the resonant length example. I see 3300 - j66 for the resonant case. ... a short counterpoise, a ground connection, the coaxial feedline or even stray capacitance between the matching unit and nearby grounded objects. ... the coax loss and impedance transformation, and the transformer. The length of the ...The No Tune End Fed Half Wave 40 - 20 - 15 - 10 meter is a fantastic choice for Low Power Portable/Stealth/Emergency Operating from 0 to 50 Watts For $79.95 you will receive: One original, newly fabricated, No Tune End Fed Half Wave antenna as depicted in the photos, tested and described below. Made in America with materials sourced from U.S. sellers. A 8" removable braided copper grounding ... SWR on the low bands dropped and the model showed that the electrical efficiency increase to about 80% rather than 40 % on the 160m band. Efficiency is >95% on 80m and even better on 40m with the new ferrite according to the model. The bands needed another alignment adjustment with the big ferrite installed.Apr 18, 2020 · Length of counterpoise should be a minimum of 30-40 feet but not the same length of the antenna wire. Shorter length counterpoise wires can be used if operation is confined to 40m or higher. Any counterpoise should be at least 1 foot above ground running away from or perpendicular to the antenna wire. End-fed half wave antennas are best for temporary antennas using low power and batteries, far from power mains and noise sources. They are more prone for problems near noise sources or consumer gear, and can easily exceed FCC RF exposure limits with surprising low power levels. KL7JR 10-40m HEARC matchbox antenna ready to go up. SWR on the low bands dropped and the model showed that the electrical efficiency increase to about 80% rather than 40 % on the 160m band. Efficiency is >95% on 80m and even better on 40m with the new ferrite according to the model. The bands needed another alignment adjustment with the big ferrite installed.May 25, 2022 · New. USA Seller. This is an End-Fed Half-Wave (EFHW ) antenna for 40/20/15 and 10m bands. Unlike many END FED antennas on the market, this one does not require the Antenna Tuner to operate. It is a resonant Half wave on 40m (7MHz) therefore also resonant on second, third, and fourth harmonics. Fixed Price. $ 279.99. My 270 foot Off-Center Fed Multiband has a Standing Wave Ratio (SWR) of 3:1 on 14.230 MHz before tuning so I was looking for better efficiency. Here is a great presentation on the end-fed by K1RF if you are interested in learning a lot more. Here's my list of parts: Plastic Project Box. Magnet Wire (Enameled #14 AWG or similar) Torroid Cores ...I will initially build an EFHW for 40m. VK3IL indicates that with his matching unit, a halfwave wire on the lowest frequency of interest will have acceptable SWR on all harmonically-related bands, so perhaps a wire cut for 40m will provide acceptable SWR on 20m and 15m. ... a 20' Black Widow pole, four 10' counterpoise wires, and a 25' length ...Jan 06, 2022 · I have worked Japan from Arizona with PSK31 and 5 watts into a length of wire dangling out of a second-story window. I have worked cw nearly 2000 miles with 2-3 watts of power and an antenna wire ... The 25m long antenna described here will get you on air without an ATU on 80m, 40m, 20m, 15m & 10m. It has been purposely reduced in length compared to a full sized 80m dipole by the insertion of a 70uH loading coil. At 7MHz, the impedance of the loading coil is about 3kΩ, and this effectively disconnects the tail of the antenna at 40m and above.This is the feed impedance and SWR of an end fed 80 meter half wave with an ideal 49:1 transformer and good stable counterpoise or ground. ... with a very good 49:1 feed transformer, in-band EFHW SWR is: Freq 3.57MHz: 7.33 MHz: 11.12 MHz: 14.86 MHz: 18.66 MHz: 22.41 MHz ... do not require a counterpoise, or that some magical length of antenna ...Antenna modeling suggests that the impedance is closer to 1800 ohms depending on the "counterpoise" length used. As the "counterpoise" itself approaches a half wavelength, the impedance approaches 5000 ohms. In the graph below I have plotted what MININEC predicts for the impedance of an end fed half wave antenna versus the "counterpoise" length.The Hertz antenna is an antenna with an electrical length of a half wavelength at its resonant frequency. It ... the RF earth or counterpoise. In many applications the co-ax feed to the antenna matching unit will act as an ... 40m 20.78m 68' 2" (21m antenna wire supplied) 30m 14.37m 47' 2" (15m antenna wire supplied) ...I think you are using Tom's 5% shift from the resonant length example. I see 3300 - j66 for the resonant case. ... a short counterpoise, a ground connection, the coaxial feedline or even stray capacitance between the matching unit and nearby grounded objects. ... the coax loss and impedance transformation, and the transformer. The length of the ...optimal length of a wire from 1 half-wave at 80m to 8 half-waves at 10m. As you can see, the length increases from 80 to 10m. This is because the velocity factor of 0.96 is only exact at the ends of a wire antenna. If a wire antenna is longer then 1 half-wave, the middle part must be calculated using a velocity factor of 1.The 25m long antenna described here will get you on air without an ATU on 80m, 40m, 20m, 15m & 10m. It has been purposely reduced in length compared to a full sized 80m dipole by the insertion of a 70uH loading coil. At 7MHz, the impedance of the loading coil is about 3kΩ, and this effectively disconnects the tail of the antenna at 40m and above.10,120 MHz = 14,07 m. 7.050 MHz = 20,20 m. The first section is fed at its end and resonates on the highest band (shortest wave length), the 20 m. Next comes a link and the complement to bring to length for the 30 m, so 14,07 m - 10,14 m = 3,93 m. Finally comes the rest for the 40m, so 20,20 m - 14,07 m = 6,13 m.The EFHW - a monoband end-fed half wave for 10m, 20m or any other HF band ... First you need a half-wave length of wire. Using the formula 468/frequency I cut a piece 16 feet 5 inches. This comes out at precisely 5m. ... The usual way of feeding an end fed half wave is against a short counterpoise, but I have found that you can feed this one ...The BM-10 headset was designed to be a lightweight (only 3 oz), articulate sounding boomset that is ideal for DXpeditions, mobile, and general rag che... Read more. The Radioddity QR20 is an ultra-portable full-frequency full-mode SDR radio with a reception from 100kHz to 2GHz and transmit from 160m to 70cm. The o...May 01, 2021 · Moreover, to achieve good results, the EFHW antenna installation would need a wire counterpoise of a reasonable length which would require some additional work and more importantly additional space, thus partially negating the generally perceived simplicity of the EFHW wire antenna configuration. There is some scope for experimentation with length vs height. So long as the overall length of each quarter-wave ele-ment remains intact, (vertical + horizontal extension) the base operating frequencies should not be seriously affected. Remember that unlike a horizontal antenna, longer does NOT mean better. A longer / lower antenna reduces ... be brought down with one of the counterpoise mentods outlined in the instructions The feed can be converted to RTS a± any time by ordering a suitable length of transmission line (Saxton #1562). We will supply this with a FL—259 attached . ($ 2.50 for the FL-259 soldered to the end of the Line) . (#1562 Line @ .11 ft.)The FCP: A 160 Meter Counterpoise for a Postage-Stamp Lot Guy Olinger, K2AV / [email protected] The finished length will. The most common vertical antenna is the. This is an End-Fed Half-Wave (EFHW*) antenna for 80/40/30/20/17/15/12 and 10m bands. Using lengths of PVC-coated wire of 10.15m, 6.78m and 5.05m respectively. They all worked well, but you may have to fiddle with the number of turns and the spacing, plus the length of the coax, to get a good SWR. I tested the 15m version against the Rybakov (7.8m and 4:1 UNUN), which is also described on this blog.Search: Counterpoise Length For End Fed Antenna. Details for the W3EDP antenna are quite straightforward, and it is basically another version of an end fed wire antenna For the 80m-band accordingly at Lambda 1/4 a wire length of 20,8m (68 5' for 20m) If the antenna in use is fed with a single wire, ladder-line or open wire, it may be impossible to keep Of course this isn't the end of the ...Random wire means to use undefined wire length (not related ... horizontal or in between/under angle - sloper. Counterpoise should be laying on the ground in direction of radiation. ... (3,5mm). I changed to RG-59 with shield diameter 4,4mm. Feeding comes on bottom via toroid FT114-43 (40m -5 turns, 30m-3 turns, 20m-2 turns). On top is ...Hendricks 40m - 15m SOTA EFHW Tuner ... T50-6 core (yellow), T94-2 (red) core not used for 40m-10m 1 - poly-varicon, w/shaft and mounting hardware 24" - magnet wire for the toroid 2 - 6-32 x 5/8" Philips pan head screw ... Solder the wire from center connection of the poly-varicon to the counterpoise lug. 3. Solder the wire from the ...New EZ-Wire EFHW Antenna from DXpatrol . NO TUNER- New Half Wafe End Feed Antenna 40m long. Features: Perfect resonance on all HF bands from 80m to 10m; 1000W SSB/CW , 250W FT8/RTTY/PSK; Low altitude assembling needed ( tested myself as low as 3m of ground with exellent SWR ratio) ... Length and PowerPart 2 - A 40 Meter EFHW with a "Radiator" wire and various length "Coax-as-Counterpoise" wires is analyzed - We will see that the common-mode current is almost always LARGER on the coax shield some distance away from the feedpoint, which is why the "counterpoise" radiates and is called "the other half of the antenna". It is sometimes said that common mode current flow on ...An electrically short efhw typically requires a good radial system or counterpoise for good efficiency. This is less important if you have a resonant half wave or multiple but you don't have that. But, even a poor system may be usable on the digital mode FT8 or CW for making very short contacts. Zak W1VT ARRL Senior Lab Engineer: May 3rd 2018 ...The 40m EFHW went up soon after. ... I think using the 80m option using a folded counterpoise and 40m EFHW driven element as an inverted-L vertical the seems to be at least comparable to the version with the loading coil and 80m tail extension. ... The final wire length in the 40m section is xxft(zz.zm). The 80m tail is xxft(zz.zzm) in length ...7 MHz Vertical antenna for ham radio band of 40 meter text in spanish and english. The Little Stick Antenna. The Little Stick antenna is an aluminium version of the Vertical Bazooka design which was made from coax. Semi-vertical trap antenna. The G3NGD Semi-vertical Trap Antenna for 1,8 3,5 and 7MHz.Bandwith on 80m is 300kHz. 20m End Fed Antenna. 20m end fed half wave vertical antenna. End Fed Half Wave Antenna for 6 / 40 Meter. 6m to 40m EndFed Half Wave Antenna project produces an inexpensive, multiband, end fed HF antenna matchbox that is quick and easy to setup and use. The EFHW antenna. A monoband end-fed half wave for 10m, 20m or any ...SWR on the low bands dropped and the model showed that the electrical efficiency increase to about 80% rather than 40 % on the 160m band. Efficiency is >95% on 80m and even better on 40m with the new ferrite according to the model. The bands needed another alignment adjustment with the big ferrite installed.Jan 06, 2022 · I have worked Japan from Arizona with PSK31 and 5 watts into a length of wire dangling out of a second-story window. I have worked cw nearly 2000 miles with 2-3 watts of power and an antenna wire ... • 40M daytime favors a dipole or EFHW • A 40M EFHW also works on 20M ... •The radiating elements including counterpoise wires •Feedlines can add loss and radiate common mode ... Length (dBi) Elev. ( ) ( ) 17' (ref) -0.2 23 54-j60 n/a 8' -0.1 26 5-j537 n/aI'm currently using a 4:1 balun with a random length wire and tuner and have RF grounded the counterpoise and all my gear to a ground rod in the soil A coax balun and ON7FU balun are compared with my current (fig») antenna Filaires EFHW Folded dipoles Long wire Loop filaires Quagi Verticals Yagi 14 MHz 144 MHz 18 MHz 21 MHz 24 MHz 28 MHz 430 MHz 50 MHz 70 MHz Baluns 1:1 baluns 1:1,5 baluns 1 ...It and all 40-10 meter EFHW antennas has one potentially significant drawback. They don't work on 30 or 17 meters without a tuner. With propagation improving I especially miss 17 meters. Some time ago I added a link to my QRPGuys EFHW which I have used often. So today I decided to not only add a link for 30 meters but also one for 17 meters.Pink - AWG22 with 25m LMR195 - Grey - Tested 3.3k ohm load. As can be seen in the above charts, significant reductions in peak SWR again, but also 3 bands are now usable (and half of 10m!). A win in this test is SWR < 2.0:1. Usable Frequencies (SWR < 2.0:1), AWG22 Wire. 6.750Mhz - 7.350 Mhz.Minimal ground system or counterpoise needed - the coax feed itself can act as a counterpoise Resonant on 80/40/30/20/17/15/12/10m with low VSWR. No tuner needed or just a 3:1 "Touch-up" tuner One simple length adjustment - no interactions between bands. Grounded at D.C. No static buildup. Shortened versions possible for limited area 3Note that the point of this article is not to provide definitive values of impdances vs. length (since many factors influence this result), but rather to show what happens as the counterpoise length approaches zero. We model a 67 ft EFHW wire for example, and vary the "counterpoise" from 2 ft down to 0.01 ft and get the following results ===>I was using my inverted-L antenna that was 1/2 wave length on 40m and 1 wave length on 20m. I designed this coupler so that there was no physical connection between the coupler and the coax cable. ... I used a 2' long wire braid and a 1' long stake in the ground to create about 3' (1m) of return ("counterpoise"). Photo 1 - Field Day 2007; Photo ...Note that the point of this article is not to provide definitive values of impdances vs. length (since many factors influence this result), but rather to show what happens as the counterpoise length approaches zero. We model a 67 ft EFHW wire for example, and vary the "counterpoise" from 2 ft down to 0.01 ft and get the following results ===>Random Length Multiband . Verticals . Flag Pole Verticals . Flag Pole Verticals •15.5 to 28 ft high •20 meters and above or 80 meters and above •Radials required •Tuner required •Remote tuner at the base is best . Lots of other Verticals S9v JR, only 18 ft and $50 Requires radialsFULL HF Coverage, no tuner needed on most frequencies. No long counterpoise, radials or feedline required. Rugged weather-resistant 50-Ohm matching network. Fast Setup and takedown. Easy Storage/transport. Stainless Hardware, UV resistant materials throughout. End-Fed Horizontal Wires(EFHW) cover multiple bands with-ouDESCRIPTION. Designed as a multi-band, portable antenna for 40m - 6m, the Buddistick PRO™ is an excellent performer with any transceiver up to 250 watts. The Buddistick PRO™ comes packaged in a compartmentalized 1000 denier Cordura™ portfolio bag and includes Versahub™ feed point, 2 aluminum arms, one standard telescopic whip, one ...End-fed, half-wave antennas (EFHWs) are a half-wavelength long and are resonant antennas on the band of interest. They use some kind of matching network to trasnsform the very high impedance at the end of a half-wave wire to about 50 Ω. Generally, they are not usable on bands for which they are not a half wavelength long.The length of my lot and the location of the trees allows for a full 40-meter wire in a sort of "inverted-L" configuration. ... EFHW, work much better with a counterpoise, or radials. Your 2M ...The length, if it *is* effective depends on if it's elevated or laying on the ground. Whenever you lay your radials (counterpoise) on the ground, they get detuned and incur increased ground losses so the length does not really matter that much. Something close to a quarter wave is fine but not critical. Product description. This is an End-Fed Half-Wave (EFHW*) antenna for 40/20/15 and 10m bands. Unlike many END FED antennas on the market, this one does not require the Antenna Tuner to operate. It is a resonant Half wave on 40m (7MHz) therefore also resonant on second, third and fourth harmonics, 20m (14MHz), 15m (21MHz) and 10m (28MHz).A correspondent having read End fed matching - design review raised a similar design by PA3HHO which uses a#43 ferrite toroid as part of an end-fed matcher, see Multi band end-fed (English). The text and diagram are inconsistent, but to allow him the benefit of doubt, lets consider the FT240-43 with a 3t primary… this is his lowest loss ...Buy End Fed EFHW-4010P 40M-10M wire antenna: Radio Antennas ... NO counterpoise needed! Frequency coverage: 7-30MHz Resonant on 40/20/15/10m Wire length ~63 feet Power Handling: 200W I.C.A.S Stainless Steel hardware Stealth Marine #18 AWG black wire Connector: Silver/Teflon SO-239 *Grounding of the coaxial cable at radio side is recommended for ...I'm currently using a 4:1 balun with a random length wire and tuner and have RF grounded the counterpoise and all my gear to a ground rod in the soil A coax balun and ON7FU balun are compared with my current (fig») antenna Filaires EFHW Folded dipoles Long wire Loop filaires Quagi Verticals Yagi 14 MHz 144 MHz 18 MHz 21 MHz 24 MHz 28 MHz 430 MHz 50 MHz 70 MHz Baluns 1:1 baluns 1:1,5 baluns 1 ...with the far end unconnected. (Counterpoise length and orientation will affect SWR.) Figure 2A (top) and 2B (bottom) - Typical EFHW Installations The EFHW's SWR will be affected by height above ground, type of ground, feed line interaction, and any nearby conductive surfaces. Raising, lowering, or re-orienting the antenna may be enough to ...The design seemed relatively simple to build, requiring only a single toroid and a capacitor made with a short length of RG-174 coax. Well, it just so happens that I bought 100-ft. of RG-174 at Dayton this year, and I found the toroid cores online from the "Toroid King" for a very reasonable price, so I decided to make my own.Total Wire Optimum Number Optimum Length Peak Gain Length (ft) of Radials of Radials (ft) (dBi) 125 9 13. 210 HF-SSB Automatic Antenna Tuner 1. SWR 1:1 at the operating frequency in the feed-wire. The graph below shows the measured VSWR of a 6. Antenna (Counterpoise) Ground is the other half of the antenna. 6-30 MHz, 500 W Owner’s Manual. a EFHW), antenna impedance is in the 2000-4000 ohms range. 4%, Luogo in cui si trova l'oggetto: Amplepuis, Spedizione verso: Worldwide, Numero oggetto: 283096767858 Balun Unun 1:49 - 49:1 For End Fed Half-Wave (EFHW) antenna 500W. The coax is tied to the bottom input connector. EFHW ANTENNAS R2010071 EAntenna EFHW4 END FEED DIPOLE 70 Mhz.Construction couldn't be more simple: Starting with 50 feet of speaker wire, separate the conductors. Cut one of the wires into two lengths, 34 and 16 feet. Splice the 16-foot wire onto the 50-foot wire. Now you have wires that are approximately a halfwave on 40M (66 feet) and 20M (34 feet). I added spade lugs to one end of each wire.Pink - AWG22 with 25m LMR195 - Grey - Tested 3.3k ohm load. As can be seen in the above charts, significant reductions in peak SWR again, but also 3 bands are now usable (and half of 10m!). A win in this test is SWR < 2.0:1. Usable Frequencies (SWR < 2.0:1), AWG22 Wire. 6.750Mhz - 7.350 Mhz.VE7HUN (BC) equal (groundwave) Unlike 1/4 wave verticals that require a fairly robust counterpoise / radial system for effective operation, the counterpoise requirements for a half-wave are far less-demanding. Mine consists of about fifteen short turf-pinned radials and the first 50' of the coaxial feedline's shield.DESCRIPTION. Designed as a multi-band, portable antenna for 40m - 6m, the Buddistick PRO™ is an excellent performer with any transceiver up to 250 watts. The Buddistick PRO™ comes packaged in a compartmentalized 1000 denier Cordura™ portfolio bag and includes Versahub™ feed point, 2 aluminum arms, one standard telescopic whip, one ...Search Cancel. Messages Toggle Dropdown Topics; Expanded; Polls; Hashtags New EZ-Wire EFHW Antenna from DXpatrol . NO TUNER- New Half Wafe End Feed Antenna 40m long. Features: Perfect resonance on all HF bands from 80m to 10m; 1000W SSB/CW , 250W FT8/RTTY/PSK; Low altitude assembling needed ( tested myself as low as 3m of ground with exellent SWR ratio) ... Length and PowerYou will also need a half-wavelength length of wire (14 or 12 gauge typically) in order to construct an antenna radiator for whichever ham band you choose. ... 80M, 60M, 40M, 30M, 20M, 17M, 15M, 12M, (11M), and 10M bands. The 49:1 unun with 3000 ohms of resistance shows a VSWR under 10:1 from 160M to 15M, and less than 3:1 from 80M to 20M. SWR ...The end fed wire regardless of its length presents a high impedance to the feedline. If the intention is to build a ½ wave mono band antenna then it is necessary to attach a 48:1 unun at the feed point given the extremely high impedance. But if it's a multi band antenna and is not ½ wavelength long on any of theThe length, if it *is* effective depends on if it's elevated or laying on the ground. Whenever you lay your radials (counterpoise) on the ground, they get detuned and incur increased ground losses so the length does not really matter that much. Something close to a quarter wave is fine but not critical. Best SWR I could get on 20m was 2.35 - interestingly, 30m and 40m were about the same (within 10%) and 15m was 1.35. ... same thing. Would adding a counterpoise help? I would love to avoid having to bring a tuner. ... You did not trim the wire to the proper length. The EFHW is shipped with about 40' of wire and the intent is to cut it down to ...The W3EDP antenna was first described in the ARRL's QST magazine in 1936. One such antenna is the W3EDP end fed. It consists of an 85ft wire fed against a 17ft counterpoise (attached to the earth point on the ATU). Some books say that you don't use the counterpoise at all on 10m. Others say that you can use a 6.5ft counterpoise on 20m.The key to end fed antenna success is the matching network interface between the long wire antenna and the coax feed line and feed line choke at the transceiver. Palomar Engineers employs a dual core matching system that offers wide bandwidth (1-61 MHz), 500 watt PEP rating, and a connection for a counterpoise or ground if desired.According to some sources (ref.1), an end-fed half-wave antenna needs a 0.05 lambda counterpoise to work correctly. In the case of the "EndFedz" EF-10/20/40 and its clones, where we are effectively using the coax as a counterpoise, we can meet this requirement by ensuring the feeder is at least 0.05 wavelengths long at the lowest operating ...Total Wire Optimum Number Optimum Length Peak Gain Length (ft) of Radials of Radials (ft) (dBi) 125 9 13. 210 HF-SSB Automatic Antenna Tuner 1. SWR 1:1 at the operating frequency in the feed-wire. The graph below shows the measured VSWR of a 6. Antenna (Counterpoise) Ground is the other half of the antenna. 6-30 MHz, 500 W Owner’s Manual. My 270 foot Off-Center Fed Multiband has a Standing Wave Ratio (SWR) of 3:1 on 14.230 MHz before tuning so I was looking for better efficiency. Here is a great presentation on the end-fed by K1RF if you are interested in learning a lot more. Here's my list of parts: Plastic Project Box. Magnet Wire (Enameled #14 AWG or similar) Torroid Cores ...I will initially build an EFHW for 40m. VK3IL indicates that with his matching unit, a halfwave wire on the lowest frequency of interest will have acceptable SWR on all harmonically-related bands, so perhaps a wire cut for 40m will provide acceptable SWR on 20m and 15m. ... a 20' Black Widow pole, four 10' counterpoise wires, and a 25' length ...The quality of the match will vary between antennas and the length of feedline. Includes 2 Velcro straps. Antennas sold separately. ... Shane KD9NJJ featured the new PackTenna End-Fed 20/40m Half Wave antenna on his Scout75 YouTube channel. ... I watched Mike K8MRD show the EFHW cut for 20M then added more wire using the banana plugs to make a ...What is Counterpoise Length For End Fed Antenna. Likes: 270. Shares: 135.What is full size - and how close do we have to be? What is full size on 80m - ¼ wave 66ft, ½ wave 133ft - other bands ½ wave multiples not matched by ATU/Coupler ( v.high Z) Forget miracle antennas - they cannot work at all well - they just don't have the aerialNew. USA Seller. This is an End-Fed Half-Wave (EFHW ) antenna for 40/20/15 and 10m bands. Unlike many END FED antennas on the market, this one does not require the Antenna Tuner to operate. It is a resonant Half wave on 40m (7MHz) therefore also resonant on second, third, and fourth harmonics. Fixed Price. $ 279.99.The EndFedz ® EFT-MTR is a 40m/30m/20m tri-band QRP antenna rated up to 25 watts. The "MTR" name was selected as LNR Precision developed this antenna to be the perfect companion to the wildly popular 40/30/20m Mountain Topper QRP transceiver. The EFT-MTR's total length is 65' of 22 AWG polystealth wire and weighs less than 4 ounces!It and all 40-10 meter EFHW antennas has one potentially significant drawback. They don't work on 30 or 17 meters without a tuner. With propagation improving I especially miss 17 meters. Some time ago I added a link to my QRPGuys EFHW which I have used often. So today I decided to not only add a link for 30 meters but also one for 17 meters.The 25m long antenna described here will get you on air without an ATU on 80m, 40m, 20m, 15m & 10m. It has been purposely reduced in length compared to a full sized 80m dipole by the insertion of a 70uH loading coil. At 7MHz, the impedance of the loading coil is about 3kΩ, and this effectively disconnects the tail of the antenna at 40m and above.The end fed wire regardless of its length presents a high impedance to the feedline. If the intention is to build a ½ wave mono band antenna then it is necessary to attach a 48:1 unun at the feed point given the extremely high impedance. But if it's a multi band antenna and is not ½ wavelength long on any of theJan 06, 2022 · I have worked Japan from Arizona with PSK31 and 5 watts into a length of wire dangling out of a second-story window. I have worked cw nearly 2000 miles with 2-3 watts of power and an antenna wire ... The 40m EARCHI matchbox is an L-C matching network designed to reduce the high impedance of a 66-67.5 foot wire (about a half wave on 40 meters) to 50 ohms. An EFHW antenna puts the feed point where your standing wave gives you high voltage, low current. A center feed puts your feed point where your standing wave gives you low voltage, high ...A 40-Meter Inverted L Antenna. Post #216. July 27, 2013. During the past few weeks, I've been experimenting with the versatile inverted L antenna for my small house lot. I find the antenna simple, inexpensive, and easily concealed. An inverted L is a bent quarter-wave Marconi vertical fed against a system of surface, buried, or elevated radials.The length, if it *is* effective depends on if it's elevated or laying on the ground. Whenever you lay your radials (counterpoise) on the ground, they get detuned and incur increased ground losses so the length does not really matter that much. Something close to a quarter wave is fine but not critical. A dipole can be fed anywhere along its length. A centre feed gives around 70Ω. ... the terminal block is just to hold it in place. There is a counterpoise connection on the side, the antenna connection on the front and the capacitor, SO239 and counterpoise/coax ground switch on the rear. ... 4m 10m 12v 15m 17m 18MHz 21MHz 28MHz 40m 70MHz 160m ...FULL HF Coverage, no tuner needed on most frequencies. No long counterpoise, radials or feedline required. Rugged weather-resistant 50-Ohm matching network. Fast Setup and takedown. Easy Storage/transport. Stainless Hardware, UV resistant materials throughout. End-Fed Horizontal Wires(EFHW) cover multiple bands with-ouLength of counterpoise should be a minimum of 20-30 feet but longer is better. If possible run the counterpoise above ground away from or perpendicular to the antenna wire and do not ground the counterpoise at the unun. You can also use the unun with no counterpoise or ground if your feedline is at least 25+Search Cancel. Messages Toggle Dropdown Topics; Expanded; Polls; Hashtags The 40m EFHW went up soon after. ... I think using the 80m option using a folded counterpoise and 40m EFHW driven element as an inverted-L vertical the seems to be at least comparable to the version with the loading coil and 80m tail extension. ... The final wire length in the 40m section is xxft(zz.zm). The 80m tail is xxft(zz.zzm) in length ...The key to end fed antenna success is the matching network interface between the long wire antenna and the coax feed line and feed line choke at the transceiver. Palomar Engineers employs a dual core matching system that offers wide bandwidth (1-61 MHz), 500 watt PEP rating, and a connection for a counterpoise or ground if desired.2.86 counterpoise. A system of conductors, elevated above and insulated from the ground, forming a lower system of conductors of an antenna. NOTE—The purpose of a counterpoise is to provide a relatively high capacitance and thus a relatively low impedance path to earth. The counterpoise is sometimes used in medium- and low-frequency ...As long as you are not using a feedline and have the KX2 internal tuner then the length of the counterpoise on 40m might not be that critical. An electrical quarter wave would however work fine. The 35.5' wire doesn't sound like a resonant half wave however but a short counterpoise of perhaps 2-5m would work fine on 20m along with the internal ...I found EFHW to be less picky about counterpoise length and terrain, plus I don't need a tuner. eladner65 liked. Reply Quote Jed Baer (@kd0ymg) Eminent Member Trial. Joined: 4 months ago. ... A 65' EFHW is resonant on 40M. The 2nd harmonic would cover 20M, 3rd 15M, and 4th, 10M. That makes perfect sense. eladner65 liked. Reply Quote eladner65 ...EFHW 40-10 Wire Antenna installation and testing Sunday - July 11, 2019 ... (33') and added the suggested length of 4' 11" of wire for the 40M and the SWR was an amazing 20! Yeah, there's something really off about it, even when I tried folding the wire in the SWR wouldn't come close down to 15!The No Tune End Fed Half Wave 40 - 20 - 15 - 10 meter is a fantastic choice for Low Power Portable/Stealth/Emergency Operating from 0 to 50 Watts For $79.95 you will receive: One original, newly fabricated, No Tune End Fed Half Wave antenna as depicted in the photos, tested and described below. Made in America with materials sourced from U.S. sellers. A 8" removable braided copper grounding ... For the capacitor and counterpoise I decided to go a little off-script here, and use a 1m length of RG-174 coax, which provides not only the counterpoise but also the 100pf of capacitance needed to make the unun work. ... When the tefzel arrived I referred back to the original article for adding the loading coil for 40m. In order to get the ...End-fed, half-wave antennas (EFHWs) are a half-wavelength long and are resonant antennas on the band of interest. They use some kind of matching network to trasnsform the very high impedance at the end of a half-wave wire to about 50 Ω. Generally, they are not usable on bands for which they are not a half wavelength long.Length: 60' Weight: 1 Lb. ... It had good all around performance but SWR was a bit higher than I'd have liked on 40m and 80m--about 3.5 at the feedpoint/2.5 in the shack. ... So I went back to the EMCOMM II but kept the longer wire (98.5 ft at 40 ft high, sloping, with a 50ft wire counterpoise), and now it works GREAT! SWR at the feed point ...It is called the EFHW-8010. It is simply a half wave end-fed on 80m which will resonate on all multiples of that frequency, loaded with a small inductance near the feed end. This inductance has the effect of bring the resonances a bit lower, particularly on the higher bands and thus improving the match. The commercially available version of ...Remember that you can choose to have the antenna resonate in the portion of the 160 meter band that you prefer - simply by adjusting the length of the counterpoise. Using an antenna analyzer simplifies this process considerably. On the other hand, you could tune the counterpoise to make the antenna resonate in the middle of the band at 1.9 MHz.I use an EFHW built for 40m with a jumper to shorten it for 30 meters. It works well on 40, 20, 10 with the jumper inserted, and on 30, 17/15 with the jumper open. ... A counterpoise with an ideal length of .05 wavelengths is recommended. Without a counterpoise, the coax and rig will create the counterpoise. This might be adequate, but if you ...The BM-10 headset was designed to be a lightweight (only 3 oz), articulate sounding boomset that is ideal for DXpeditions, mobile, and general rag che... Read more. The Radioddity QR20 is an ultra-portable full-frequency full-mode SDR radio with a reception from 100kHz to 2GHz and transmit from 160m to 70cm. The o...The length of my lot and the location of the trees allows for a full 40-meter wire in a sort of "inverted-L" configuration. ... EFHW, work much better with a counterpoise, or radials. Your 2M ...For the capacitor and counterpoise I decided to go a little off-script here, and use a 1m length of RG-174 coax, which provides not only the counterpoise but also the 100pf of capacitance needed to make the unun work. ... When the tefzel arrived I referred back to the original article for adding the loading coil for 40m. In order to get the ...I have several efhw - 66ft, 126ft...all have a 49:1 with 15ft counterpoise wires. Also your coax shield will act as a counterpoise. I use a common mode balun (can be an ugly balun) at the 49:1 box. A 66ft efhw should have nil swr on 40m and 20m and be tunable on 10-40m.May 01, 2021 · Moreover, to achieve good results, the EFHW antenna installation would need a wire counterpoise of a reasonable length which would require some additional work and more importantly additional space, thus partially negating the generally perceived simplicity of the EFHW wire antenna configuration. May 01, 2021 · Moreover, to achieve good results, the EFHW antenna installation would need a wire counterpoise of a reasonable length which would require some additional work and more importantly additional space, thus partially negating the generally perceived simplicity of the EFHW wire antenna configuration. What is Counterpoise Length For End Fed Antenna. 80-10 Meters. Unlike a commonly used End-fed antennas with 9:1 UNUNs and non-resonant length of wire, EFHW antennas are not prone to high common mode current and problems associated with it mainly due to the high common mode isolation of the transformer (MyAntennas designs) and use of the resonant.The basic formula for determining the wire length of a center fed, 1/2 wave wire dipole or inverted Vee antenna is: 143 ÷ freq (mhz) = Length (metres). The inverted Vee antenna will be shorter by 2 - 5% depending on the angle from horizontal. Dipoles have a feed point of about 75Ω in free space, and can be fed with 50Ω to 75Ω coax with or ...End-fed half wave antennas are best for temporary antennas using low power and batteries, far from power mains and noise sources. They are more prone for problems near noise sources or consumer gear, and can easily exceed FCC RF exposure limits with surprising low power levels. KL7JR 10-40m HEARC matchbox antenna ready to go up.New EZ-Wire EFHW Antenna from DXpatrol . NO TUNER- New Half Wafe End Feed Antenna 40m long. Features: Perfect resonance on all HF bands from 80m to 10m; 1000W SSB/CW , 250W FT8/RTTY/PSK; Low altitude assembling needed ( tested myself as low as 3m of ground with exellent SWR ratio) ... Length and PowerThe No Tune End Fed Half Wave 40 - 20 - 15 - 10 meter is a fantastic choice for Low Power Portable/Stealth/Emergency Operating from 0 to 50 Watts For $79.95 you will receive: One original, newly fabricated, No Tune End Fed Half Wave antenna as depicted in the photos, tested and described below. Made in America with materials sourced from U.S. sellers. A 8" removable braided copper grounding ... I think you are using Tom's 5% shift from the resonant length example. I see 3300 - j66 for the resonant case. ... a short counterpoise, a ground connection, the coaxial feedline or even stray capacitance between the matching unit and nearby grounded objects. ... the coax loss and impedance transformation, and the transformer. The length of the ...This online calculator tells you how the amout of inductance your loading coil will need to have. Total height of antenna in feet. Enter a length between 1 and 250 feet. Distance from antenna base to the center of the coil in feet. (Enter "0" for a base loading coil.) Enter a distance between 0 and 250 feet that is less than half the total ...His efhw antenna dosen't have a counterpoise (or using a coax as counterpoise), so I doubt if it can effective work. ... (i.e. running 15m on a 40m halfwave wire) you actually don't need the ...For the capacitor and counterpoise I decided to go a little off-script here, and use a 1m length of RG-174 coax, which provides not only the counterpoise but also the 100pf of capacitance needed to make the unun work. ... When the tefzel arrived I referred back to the original article for adding the loading coil for 40m. In order to get the ...Apr 18, 2020 · Length of counterpoise should be a minimum of 30-40 feet but not the same length of the antenna wire. Shorter length counterpoise wires can be used if operation is confined to 40m or higher. Any counterpoise should be at least 1 foot above ground running away from or perpendicular to the antenna wire. This is the reason that all EFHW antennas, counterpoise or not, require a big honking transformer at the feed point to function, as the SWR may be as high as 100:1 if you just attempted to feed it directly. No tuner can cope with that. ... You can trim another wire for 40m that is approximately double the length of the PAR 20m wire. The ...The 40m EFHW is physically broken into 3 sections via two insulators inserted so that the first (when viewed from the tuner end of the wire) isolates a 20m EFHW, the next section when added on via a jumper (I use alligator clips and spade lugs) is resonant on 30m ... length short counterpoise wire for each band. It works like a charm and doesn ...How to determine the wire length Antenna Wire - longer for better low band operation Coax Cable - typically 50-75% of antenna length Counterpoises/radials - use non-resonant length, raised, multiple with various lengths Bands Covered (meters) Wire Length (feet) Minimum Coax Length (feet) 40-30-20-15 35-43, 49-63, 70-85 35 40-30-20-17 35-45, 54-64, 67-77 35May 18, 2019 · The charge pool in the schematic is either of the plate, direct ground, or both attached to the chassis of the pulse generator. The 54'wire that is attached to the pulse generator can be arranged horizontal, vertical 45 degrees or strung 1' off the ground and measure 600 =- Ohms. The Antenna CalculatorforHalf-Wave Dipoles. Enter your desired frequency (MHz) of operation (i.e. 3.55). If you have no particular preference within a given ham radio band, then simply enter its center frequency (i.e. 7.15 for the 40 meter band). To fully understand the results obtained by this calculator, please take a few minutes to read the ...A shortened multi-band End-Fed Half Wave (EFHW) antenna for 80-10m Steve Nichols G0KYA A shortened multiband antenna, about 23m long, for 80m-10m that offers low SWR (1.3:1) on 80m and 40m, and below 3:1 on 20, 15 and 10m. The antenna has a full 300kHz bandwidth on 80m between 3:1 SWR points. But performance is down about 8-12db on a dipole on 80m.The quality of the match will vary between antennas and the length of feedline. Includes 2 Velcro straps. Antennas sold separately. ... Shane KD9NJJ featured the new PackTenna End-Fed 20/40m Half Wave antenna on his Scout75 YouTube channel. ... I watched Mike K8MRD show the EFHW cut for 20M then added more wire using the banana plugs to make a ...May 01, 2021 · Moreover, to achieve good results, the EFHW antenna installation would need a wire counterpoise of a reasonable length which would require some additional work and more importantly additional space, thus partially negating the generally perceived simplicity of the EFHW wire antenna configuration. An End Fed Half Wave (EFHW) antenna for operation on 20, 30 and 40 meters was built for SOTA operation. By using traps, the antenna works on all three bands with no operator interaction. After acquiring a MTR3b for SOTA activations I decided I needed a different antenna than the End Fed Random Wire (EFRW) or the speaker cable 20 meter dipole I use with my KX2.I'm currently using a 4:1 balun with a random length wire and tuner and have RF grounded the counterpoise and all my gear to a ground rod in the soil A coax balun and ON7FU balun are compared with my current (fig») antenna Filaires EFHW Folded dipoles Long wire Loop filaires Quagi Verticals Yagi 14 MHz 144 MHz 18 MHz 21 MHz 24 MHz 28 MHz 430 MHz 50 MHz 70 MHz Baluns 1:1 baluns 1:1,5 baluns 1 ...Jul 7, 2020. #2. Look into a resonant end fed half wave or EFHW, which will operate on its fundamental design frequency and most harmonics. For example, a 40m version at about 64ft long also operates fine on 20, 15 and 10m. A 133ft long 80m version will do 80m through 10m plus WARC bands depending on mfr.The 40m EARCHI matchbox is an L-C matching network designed to reduce the high impedance of a 66-67.5 foot wire (about a half wave on 40 meters) to 50 ohms. An EFHW antenna puts the feed point where your standing wave gives you high voltage, low current. A center feed puts your feed point where your standing wave gives you low voltage, high ...It is called the EFHW-8010. It is simply a half wave end-fed on 80m which will resonate on all multiples of that frequency, loaded with a small inductance near the feed end. This inductance has the effect of bring the resonances a bit lower, particularly on the higher bands and thus improving the match. The commercially available version of ...There is some scope for experimentation with length vs height. So long as the overall length of each quarter-wave ele-ment remains intact, (vertical + horizontal extension) the base operating frequencies should not be seriously affected. Remember that unlike a horizontal antenna, longer does NOT mean better. A longer / lower antenna reduces ... The RU-4:1 Unun was designed to allow easy interface of LDG S9 vertical antennas to the LDG line of Automatic Antenna Tuners With the view to establish a quick and easy multi-band antenna deployment for portable and camping operations a simple long wire antenna with an earth or earth plus counterpoise arrangement with a 9:1 voltage unun is one ... Note that the point of this article is not to provide definitive values of impdances vs. length (since many factors influence this result), but rather to show what happens as the counterpoise length approaches zero. We model a 67 ft EFHW wire for example, and vary the "counterpoise" from 2 ft down to 0.01 ft and get the following results ===>The Antenna CalculatorforHalf-Wave Dipoles. Enter your desired frequency (MHz) of operation (i.e. 3.55). If you have no particular preference within a given ham radio band, then simply enter its center frequency (i.e. 7.15 for the 40 meter band). To fully understand the results obtained by this calculator, please take a few minutes to read the ...About Fed Length Antenna For End CounterpoiseThe No Tune End Fed Half Wave 40 - 20 - 15 - 10 meter is a fantastic choice for Low Power Portable/Stealth/Emergency Operating from 0 to 50 Watts For $79.95 you will receive: One original, newly fabricated, No Tune End Fed Half Wave antenna as depicted in the photos, tested and described below. Made in America with materials sourced from U.S. sellers. A 8" removable braided copper grounding ... Base Antenna, Portable, HF, 160-6 meters, 1.8-54 MHz, 500 W SSB, 60 ft. Length, PL-259, Each See More Specifications. CHAMELEON ANTENNA EMCOMM-II - CHAMELEON ANTENNA Portable HF Antennas CHA-EMCOMM-II. 4.75 out of 5 stars. Part Number: CHA-EMCOMM-II. Estimated Ship Date: Tomorrow. $129.99. Recommended Parts.For 40m operation the choke offers the least, but not zero, reactance to the antenna currents. The coil helps resonate the antenna with its lumped inductance making it much shorter than the tradition half-wave length. The wire beyond the choke has plenty of current, but fades to nothing quick much the way documented by Terman in 1943 [1].The 40m-10m (67' wire) version covers: 40/20/15/10m The Transformer. ... There are some changes if you want to do a 160m EFHW antenna. First, you need 260 feet of wire and no coil on the antenna. ... This is a very flexible antenna and it doesn't even require a counterpoise. Just ground it and you're good. Here are some examples:CM Standardized OCF vertical for 2-radial model converted to EFHW with variable bend point and angles CM #14 AWG. Over Real ground, Element height fixed at 12 meters. Variable feedpoint height. ... SY cp=4.534867 'counterpoise length - meters SY rad1=L*(1-R) 'Length of Radial 1 - meters SY rad2=L-rad1 'Length of Radial 2 - meters SY lat1=65 ...The "Counterpoise" is a short, typically one twentieth (0.05 * ... Counterpoise. 40m. 5. 45. I did not need it. 30m. 5. 75. ... Yes, indeed EFHW antennas are very useful for SOTA or other field operation. But I would caution its usage for higher power than 10-15W. Since the tuner's location is best if it is handy for the operator, one end ... terminate mathematical definitionesp8266 pinout vinlvmpd civilian jobslg bootloader unlock apkbowser h22 hoppernumber groups after trillionmariana islands resortsgrado blackfarting glitter twitter ost_