I'm building a simple 2-el vertical array for 40M, with one element driven against radials, and a passive reflector with an equal number of radials. NEC predicts 2.7 dBi over lousy ground at 15 degre
Hi Jim, Have you tried measuring the current in the parasitic when connected? 73, Greg, ZL3IX We've got this set up in W6GJB's pasture, roughly 5 miles S of me, with me centered on the main lobe, and
Jim, Equipment wise, is this reciprocal if you use the array for your receive measurements? Jim, KR9U I'm building a simple 2-el vertical array for 40M, with one element driven against radials, and a
I think your too close to tell, or just coupling into every thing around there. Knowing you I am sure you have done every thing right. Try calling CQ during day light hours and see what signal streng
I think your too close to tell, or just coupling into every thing around there. I get good F/B on arrays I test, even within a wavelength or two. As long as the elements are reasonable length (under
Hi, Jim I'm most suspicious regarding your radial systems: * Are your radials resonant? For the purposes that you are attempting, they need to be, in order to maintain the phase relationship between
* Are your radials resonant? For the purposes that you are attempting, they need to be, in order to maintain the phase relationship between the driven element and the parasite. Actually there are thr
See correction below in RED. Looks like the Reflector wouldn't pass the EZNEC attachment. I'll have to forward that in separate e-mails - not on the reflector Hi, Jim I'm most suspicious regarding yo
Regarding how the RBN works: You will be re-spotted if you change frequency (more than about 0.1 kHz), or after 10 minutes. Note that due to QRN/QRM/QSB, some Skimmers may not hear you the first time
I was convinced by K2AV that the Yagi idea (passive reflector) was a bad idea because it is too sensitive to ground characteristics. I went to the Christman phasing method and it plays nicely. Anothe
Very fine Jim. What kind of gain readings are you getting now? Christman phasing is at 71 degrees? I was thinking 90 degree phasing. Whats the reasoning for this? -- Jim K9TF All good topband ops kno
I have seen some thing like those military surplus mast sections. I believe the ones I saw were made by Shakespear. I think this is the same company that made those good trout fishing rods and reels
Read and envy: http://shakespeare-military.com/masts.asp They take Visa and Mastercard! Tim N3QE I have seen some thing like those military surplus mast sections. I believe the ones I saw were made b
Christman phasing is at 71 degrees? I was thinking 90 degree phasing. Whats the reasoning for this? Optimum phasing of two verticals 1/4 wave apart is never 90 degrees, unless the user for some reaso
Optimum phasing of two verticals 1/4 wave apart is never 90 degrees, unless the user for some reason wants a single-point zero-angle null and less than maximum gain. Optimum element current delay for
I guess 90 degree phase shift might result in a cardioid pattern? Charlie, K4OTV Optimum phasing of two verticals 1/4 wave apart is never 90 degrees, unless the user for some reason wants a single-po
With the K6MI "Chews Ridge Gang," about 50 miles E of Monterey, CA. We do QRP battery. 73, Jim K9YC All good topband ops know how to put up a beverage at night. _________________ Topband Reflector
We didn't measure gain, but we did measure F/B. Gain is rather difficult to pin down. Even F/B is tricky -- there was at least 6dB of QSB on the rear setup (with the 71 degree line traded to the othe
Right. There's some discussion of this in the ON4UN book, where I found the Christman matching. As published there, it's 84 degrees of 50 ohm line in each element, plus 71 degrees of 50 ohm line in t