1. Step 2. Put the coax connector into the hole and use a marker to mark the four holes for the screws (see 2A and 2B). Drill the four fastening holes with a 9/64 inch bit. Next to where the coax connector will be installed, drill a 13/64 inch hole for the counterpoise connection. 2A. 2B. Step 3.. 4 Responses to " EFHW : progress on 20 meters" Dave, WD8CIV: 25 May 2016 at 17:17 UTC. I wonder if a different length counterpoise might help on 40M. The apartment ... Vary coax length on EFHW 80m EFHW (coax only) Coax grounded No CMC Vary coax from 45ft (0.16wl) to 265ft (0.97wl) Watch the movie:. 2 days ago · The W3EDP End-fed antenna is a classical antenna in our series of HS4 Legendary Multiband Wire Antennas We strung it in the trees of the campsite, fed-end high with a 60 foot RG58 feed, 45 degree of slope with 35 feet of wire For sale here is our End Fed Half Wave (EFHW) antenna for 160m/80m/40m If the ground is not very conductive add supplementary radial. 2 days ago · The W3EDP End-fed antenna is a classical antenna in our series of HS4 Legendary Multiband Wire Antennas We strung it in the trees of the campsite, fed-end high with a 60 foot RG58 feed, 45 degree of slope with 35 feet of wire For sale here is our End Fed Half Wave (EFHW) antenna for 160m/80m/40m If the ground is not very conductive add supplementary radial. The general rule is to position an antenna is "as high as wide". This half-wave elevation provides the maximum signal to the sides with minimum signal skyward. No feedline is considered. Click here to see a table of the elevation effects on antenna radiation pattern for these bands: 160m >, 75/80m, 40m, 20m, 15m, 10m and 6m. 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. The EFHW cut on its fondamental band, 40m here, can be used on all harmonic bands : 40/20/10 m. ... The theoretical length for the radiating wire can be calculated with my online Harmonic calculator 14.050 MHz = 10,14 m ... This can be done by earthening the coupler or tranformer or by adding some "counterpoise", without this there will be some. Counterpoise: •Important to have for stable, predictable performance •Length isn’t critical, but little/no benefit for lengths > 0.05 wavelenth •Don’t go >0.25 wavelength •Watch out for the high voltages (at X) •At 5 W (and 2000 ohms), V CAP (Peak) = 100 V •At 100 W (and 2000 ohms), V CAP (Peak) = 450 V •At 1500 W (and 2000 .... EFHW-60S-1K Single-band End Fed Half Wave Antenna ... NO counterpoise needed! (Grounding recommended) Frequency coverage: 5.4MHz ; Resonant on 60m; Wire length ~87 .... A "counterpoise" in the form of an attached coaxial cable shield, a short wire, or even by stray capacitance, is employed. Compared to a center-fed half-wave dipole, the EFHW feed impedance is much higher,. 2022. 7. 29. · The first kind is deliberately non-resonant, uses a 9:1 unun and requires a tuner. It may require a good tuner if you want to work the low bands on a short wire. Some suggest a counterpoise of .05 or .1. Common lengths are 44' 53' etc. The second kind is EFHW which is half wave resonant on the lowest band but is also resonant on all harmonics. The EFHW cut on its fondamental band, 40m here, can be used on all harmonic bands : 40/20/10 m. ... The theoretical length for the radiating wire can be calculated with my online Harmonic calculator 14.050 MHz = 10,14 m ... This can be done by earthening the coupler or tranformer or by adding some "counterpoise", without this there will be some. Length of counterpoise should be a minimum of 30-40 feet but not the same length of the antenna wire. ... A special case of ... With dipoles, one half of the antenna is your ground. The EFHW cut on its fondamental band, 40m here, can be used on all harmonic bands : 40/20/10 m.. 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 .... 2 days ago · The W3EDP End-fed antenna is a classical antenna in our series of HS4 Legendary Multiband Wire Antennas We strung it in the trees of the campsite, fed-end high with a 60 foot RG58 feed, 45 degree of slope with 35 feet of wire For sale here is our End Fed Half Wave (EFHW) antenna for 160m/80m/40m If the ground is not very conductive add supplementary radial. Aug 17, 2021 · 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 .... Aug 06, 2017 · The resonant EFHW is not much different than a center fed dipole of the same length except you are exciting it from one end. Put it horizontal at 20 to 30ft off the ground and it will be a great NVIS antenna on 80 and 40m but will also make DX contacts there. It will have a lower angel takeoff on 20m if its 1/2 wave off the ground like 33ft.. A ttaching a counterpoise wire to the common point of the auto-transformer provides the antenna radiator something to push against rather than the coax shield. The counterpoise wire does not have to be similar in length to the main radiator wire and just a short wire is all that is needed, about 0.05 λ. This calculates to ≈ 4.2 m or ≈14 ft .... Efhw counterpoise length can connect an earth or short (1m) counterpoise to the earth (green) terminal. This may be required if using the antenna as a horizontal end fed dipole with a short length of coax. If you cannot get the antenna to tune, check the wiring first. Do not cut the capacitor any shorter than 2in less than the starting length. RFI, Ferrites, and Common Mode Chokes For Hams Most recent update April 2019. This tutorial is directed specifically to RFI in ham radio applications. It includes an extended discussion of the use of common mode chokes in antenna systems and for suppression of RFI. No matter what band or application, you'll find it all there. Half-Wave (EFHW) Antenna Stephan M. Schmid, HB9EAJ Version 1.2 – August 17, 2021 Figure 1: A typical inverted-L EFHW antenna setup with one bypassable loading coil.Table of Contents ... Figure 9: Counterpoise wire length: zero, 1m, 2.5m, 5m, 10m and 20m.With 20ft of feedline and a 9:1 balun type antenna I think a 3ft jumper from the radio to the choke then 20ft of coax to the. But I think the EFHW performs as well and again is much simpler to put up and feed. for today anyway, I'm sold on the EFHW antenna! 2019-11-17 I really like my QRPGuys No Tune End Fed Antenna . I've been using it as an inverted vee running north and south for a couple weeks now along with my MFJ 40-10, 300 watt end fed half wave which is set up as a sloper, running east. The overall length of the 80-10 version of this antenna is about 23 mtrs (≈75 ft) - only about 1/4 λ on 80 mtrs. So a loading coil is added. The <b>length</b> of the wire beyond the coil has to be adjusted for the desired portion of the 80 mtr band (or of the 40 mtr band, if making the 40-10 antenna) and the local environment. About Counterpoise Length For Antenna End Fed . 66' Length . At a total length of 75 feet, the antenna consists of a 25 foot matching section with a 50 foot radiator. ... This is a 200W version of popular EFHW -8010 End-Fed Half-Wave ( EFHW *) antenna.. 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 coax, and a 14-1/2 ft fiberglass fishing pole with DIY collar and guy lines.. 2022. 7. 29. · Also, do not listen to internet “experts” saying that some form of hanging counterpoise wire of 0.05 wavelength should be added to the ground connection of the transformer box. ... Do you have a recommended feedline length for EFHW antennas? No, You can use any length of 50 Ohms Coaxial cables such as RG8x, RG8, RG213,. But I think the EFHW performs as well and again is much simpler to put up and feed. for today anyway, I'm sold on the EFHW antenna! 2019-11-17 I really like my QRPGuys No Tune End Fed Antenna . I've been using it as an inverted vee running north and south for a couple weeks now along with my MFJ 40-10, 300 watt end fed half wave which is set up as a sloper, running east. 2022. 7. 29. · The first kind is deliberately non-resonant, uses a 9:1 unun and requires a tuner. It may require a good tuner if you want to work the low bands on a short wire. Some suggest a counterpoise of .05 or .1. Common lengths are 44' 53' etc. The second kind is EFHW which is half wave resonant on the lowest band but is also resonant on all harmonics. 2018. 11. 16. · EFHW Counterpoise Current flowing ... For a suspended counterpoise wire, the "ideal" length would be 1/4 wavelength. That would provide the lowest impedance on the common side of the feed point and send the greatest amount of power into the antenna and minimize any RF on the outside of the coax shield. . 2021. 7. 20. · To explore parameter space a little, I modeled a couple of lengths for the counterpoise and see how the wire is resonant across the band when fed with various impedances at the driven point. End-Fed at various impedances –. 2022. 7. 29. · Also, do not listen to internet “experts” saying that some form of hanging counterpoise wire of 0.05 wavelength should be added to the ground connection of the transformer box. ... Do you have a recommended feedline length for EFHW antennas? No, You can use any length of 50 Ohms Coaxial cables such as RG8x, RG8, RG213,. 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 ===> We can see that the magnitude of the impedance approaches infinity as we make the counterpoise progressively shorter. Steve AA5TB has presented a similar graph, showing instead both R and jX. A dipole can be fed anywhere along its length. A centre feed gives around 70Ω. A ‘Windom’ type off centre fed dipole (fed 38% along its length) provides around a 200Ω feed. The feed impedance at the very end of a half wave is thousands of ohms, usually somewhere between 2000Ω to 5000Ω, which we need to match to our 50Ω transceiver.. Jan 19, 2017 · The Antenna Tuner will load an End Fed Long Wire effectively, especially if it is cut to aprox. an Odd Quarter Wave-Length of your target band... 186 ft / 16.5 ft and 186 ft / 33 ft... The entire antenna is #12 stranded insulated copper. The Antenna Tuner is a 1977 HeathKit HFT-9, a small QRP size tuner of the Cap-Coil-Cap double"L" design.. 2 days ago · The W3EDP End-fed antenna is a classical antenna in our series of HS4 Legendary Multiband Wire Antennas We strung it in the trees of the campsite, fed-end high with a 60 foot RG58 feed, 45 degree of slope with 35 feet of wire For sale here is our End Fed Half Wave (EFHW) antenna for 160m/80m/40m If the ground is not very conductive add supplementary radial. 2020. 10. 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. 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. 4 Responses to “ EFHW: progress on 20 meters” Dave, WD8CIV: 25 May 2016 at 17:17 UTC. I wonder if a different length counterpoise might help on 40M. The apartment window antenna made by MFJ requires you to adjust the length of the counterpoise by rolling up the free end in order to get the lowest SWR. Nov 13, 2012 · With EFHW antennas using an adjustable matchbox there is a great willingness to use the tuning of the matchbox to “fix” a detuned wire or a wrong length wire. 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