Lay it on the ground. Sent from my iPhone ...nr4c. bill
> On Sep 8, 2018, at 9:50 AM, Tom McCulloch <[email protected]> wrote: > > This is probably NOT what you are looking for but it's about random length > antennas...it goes back to Jan 29, 2017. > > hope this helps: > > I'd call an ad-hoc antenna that works on multiple bands with an ATU a > "Kinda-Random Antenna" (KRA). (Apologies to linguistic purists.) > > A simplified definition might be: > > A. long enough to work within the maximum limits of the ATU's L-network on > the lowest band used > B. presents a reasonably low impedance on all bands used (e.g., doesn't look > like an end-fed half-wave) > > ATUs have limited monotonicity and granularity, as well as stray impedances, > so in practice there is a third criteria: > > C. tunable on each band used despite specific L-network idiosyncrasies > > This third criteria is the hardest one to predict for a given ATU design, as > the idiosyncrasies vary with PCB layout and actual component values. They may > only impact the highest bands, or for a particular antenna, the bands on > which Q is the highest. For our ATU designs, we try to minimize strays and > keep the network monotonic by using tightly toleranced capacitors and > toroidal inductors. > > While a wide range of wire lengths will meet the requirements of a "KRA" in > the field, we've found from experience that something in the 25'-28' range > works on all bands from 40 meters up, and roughly twice this for 80 meters > up. Since it's impossible to predict the effect of ground losses, > obstructions, deployed wire angles, etc., you may occasionally need to add or > remove wire to obtain resonance on all bands used. > > 73, > Wayne > N6KR > > > Tom > > WB2QDG > > K@ 1103 > > >> On 9/6/2018 11:57 PM, JEROME SODUS wrote: >> Hello, >> >> >> I want to re-read a post that Wayne n6kr made about a wire-antenna tossed up >> a tree and the location of a counterpoise; this was relative to portable >> operating a kx2 or kx3, if I recall correctly. >> >> >> But my archive search has come up empty. >> >> >> My recollection is he recommended placing the counterpoise in a direction >> opposite to the wire-antenna. >> >> I need to verify that recollection. >> >> Hopefully someone has saved that post. >> >> TIA for any help. >> >> 73 Jerry km3k >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [email protected] >> > > -- > > I'm happy to be anywhere -- Keith Richards > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
