WebEFHW Counterpoise. For the last few months, I have been operating a homebrew 40-10 EFHW that runs just above my roof. It’s my first HF antenna, and is a stealthy solution to my HOA restrictions. The UNUN I built has a connection for a counterpoise, but I didn’t attach one, so the 90 feet of coax that runs from the UNUN to my TS-590SG is ... WebA 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 …
MFJ-1982MP, END FED, 1/2 WAVE, 80-10M, 300W, WIRE ANTENNA
WebMay 1, 2024 · For instance, in the case of a typical 80m-10m coverage EFHW antenna, the length of the counterpoise must be around 0.05λ of 80m. This short length of counterpoise wire is vital to improve the overall performance and more importantly it allows us to aggressively throttle the CMC on the coaxial cable by judicious use of a set of RF current … Web40-160m EFHW kite antenna. ... about 11% radiation efficiency on 160m which is about the best that can be expected with a limited ground system and short antenna. ... it tunes the full 160m and 80m bands by selecting tap points on the coil with an alligator clip connected to the end of the radiator wire. In practice I found that the tap points ... first states to join the union
EFHW - SOTABEAMS
WebShortened EFHW Antenna 80-10m A shortened multiband antenna, about 23m long, for 80m - 10m bands with a low SWR (<1.3) on 80m and 40m, and < 3 till 10m. Bandwith on 80m is 300kHz Category : Antennas/End-Fed/End Fed Half Wave Antenna By G0KYA Hits: 3837 Votes: 10 Rating: 6.00 About Shortened EFHW Antenna 80-10m WebThe line may be a short one carrying audio or control signals between a computer and a radio, video between a computer and a monitor, noisy power wiring, or feedlines for antennas. ... Nowadays with the CMC my noise level on 80m band is below S6 (-90dBm)) Enfed or EFHW antenna are usually generated by design some Common Mode Currents … Web80m short end-hat-loaded verticals ... Obviously, an EFHW antenna has a "half-wave" length only at one specific frequency. So, a "multi-band end-fed half-wave" antenna is actually a bit of a misnomer... A "half-wavelength" radiator has a high impedance ( = high voltage, low current) at the feedpoint. In fact, both ends of a such a radiator - so ... campbell soup recipes chicken crock pot