Ron, your random wire setup appears nearly the same as mine, including all the grounds you describe. I use a 130' Inverted L @ 25' fed by 50' of coax though a 9:1 unun, with the shield choked at the shack end, and 3ea 125' counterpoises (2 of which run about 22' under, and parallel to, the random wire).
However, I tested various ground and counterpoise configurations, and my station performs better when the counterpoises are not earth grounded. I do not earth-ground or choke the antenna-end unun, so that my coax acts as a 4th counterpoise. I think every installation's ground and counterpoise configuration will perform differently, depending on soil conductivity, surrounding objects, relative heights and lengths of components, and other variables. I suggest anyone with an end-fed wire test different ground configurations, vis-a-vis counterpoises and earth grounds, to see which gives the best performance for a particular location. Your post made me think of, and I recommend, the following 3 videos by Steve Ellington, N4LQ <https://www.youtube.com/n4lq>, which helped me quite a bit with this issue. He's a half-wave guy, but I think his analyses are valid for the random wire. The first deals with this very issue: EFHW Grounding Compared <https://youtu.be/pT_o487XQbs> The next two are related, I think. They're very descriptive, in a practical sense, of what's going on: EFHW Antenna Configuration Test Results <https://youtu.be/wHcaqvXZR8E> EFHW Installation Summary or Is your feed line part of the antenna? <https://youtu.be/MzfQybYMlUc> I apologize for the late post, but hope the Steve Ellington videos help those who might still be interested. Cheers, and 73, Gus, K5GMB On Fri, Jan 29, 2021 at 8:21 AM Ron Bosch via BVARC <[email protected]> wrote: > Mike, > I do not believe, and my experience backed up, the counterpoise (I run 2 > 35' wires as counterpoise) prevented the feed line from radiating. I do > believe the direct ground I ran in addition to the counterpoise reduced the > common mode current, as well as the many chokes I run, and the lightning > arrestor I run close to my shack. I also saw a marked difference by > bonding the station ground rods (I run 2 4 foot ground rods about 6 feet > apart just off of and below my station at the closest place I can get them > in the ground), I run large gauge, pvc coated, grounding wire the 40 feet > or so to my utility ground. I also have an 8' ground sunk at the base of > my mast system, and that is also bonded to the utility ground about another > 30 feet from the utility ground. That ground is where I run the UnUn, as > well as the ground bonded to the mast. I expect the coax still radiates > some, but it is reduced since the current on braid of the coax is > interrupted by the lightning arrestor before it gets to my shack, and any > that does make it back to the radio is bled to the station ground. > > Ron > KE4DRF > > On Thu, Jan 28, 2021 at 1:14 PM Gary Sitton via BVARC <[email protected]> > wrote: > >> Mike, I have just started using it and have no idea >> what the pattern looks like. It's probably a mix of >> horizontal and vertical polarization with a medium >> angle of radiation. I also suspect that the highest >> power is broadside to the wire as most are. The >> noise level is not bad and the signal levels seem >> to be fairly good also. I just wanted an antenna >> with 40 meter capability for shorter skip QSOs. >> >> 73, Gary >> >> On 1/28/2021 12:47 PM, Michael Giannaccio via BVARC wrote: >> >> Thanks Gary! >> >> I had that antenna on my list as well. I'd love to know what kind of >> radiation pattern you think you might have. >> >> >> >> -- >> 73, >> >> Mike Giannaccio >> KI5LFZ >> >> >> On Thursday, January 28, 2021, 11:23:39 AM CST, Gary Sitton via BVARC >> <[email protected]> <[email protected]> wrote: >> >> >> Mike: >> >> I just installed a MyAntenna EFHW 40-10-2K wire antenna. I chose >> the 40 to 10 model as I do not use 160 or 80 meters. It is hung in an >> inverted V configuration: the center at 30' and ends at about 10' from >> the ground. The total length was about 63' and the final SWR was less >> than 1.5:1 on the the phone bands except for 10 meters where it was >> 2:1. The modeI got was designed for 1.5 KW peak and seems to be >> of excellent construction. There is a 7:1 UNUN included in the package >> but I did not examined it. I would be glad to discuss any other details. >> >> 73, Gary K5AMH >> (713) 305-6765 >> >> 1/28/2021 9:45 AM, Michael Giannaccio via BVARC wrote: >> >> Does anyone have any experience with this product: >> https://palomar-engineers.com/ferrite-application-experts-2/Bullet-End-Fed-500-1500-Watt-Antenna-1-8-61-MHz-55-203-FT-p74356626 >> >> Or this product: >> https://www.hyendcompany.nl/antenna/multiband_40201510_m/product/detail/2/HyEndFed_4_Band_Black_Clamp_MK3#prod >> >> >> An end fed antenna is the best fit for my property. I can easily run the >> 71 foot model as either an inverted L sloper or as a regular sloper. The >> highest point will be 18-20 feet and the low point will be around 6-7 feet. >> >> I have a few questions about this antenna as well making a DIY 20 meter >> delta loop. If anyone is willing to give me a few minutes of your time to >> pick your brain off this thread that would be much appreciated. >> >> >> >> -- >> 73, >> >> Mike Giannaccio >> KI5LFZ >> >> ________________________________________________ >> Brazos Valley Amateur Radio Club >> >> BVARC mailing >> [email protected]http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >> >> >> -- >> Gary Sitton, K5AMH >> [email protected] >> SDR/DSP Consultant, >> "Have FFTs, Will Travel." >> ________________________________________________ >> Brazos Valley Amateur Radio Club >> >> BVARC mailing list >> [email protected] >> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >> >> ________________________________________________ >> Brazos Valley Amateur Radio Club >> >> BVARC mailing >> [email protected]http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >> >> >> -- >> Gary Sitton, K5AMH >> [email protected] >> SDR/DSP Consultant, >> "Have FFTs, Will Travel." >> ________________________________________________ >> Brazos Valley Amateur Radio Club >> >> BVARC mailing list >> [email protected] >> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >> > ________________________________________________ > Brazos Valley Amateur Radio Club > > BVARC mailing list > [email protected] > http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >
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