Ted
In band SO2R is always rough. I have tried to listen on a second receiver and
even with bandpass filters and stubs I haven't had much success. I afraid I
have nothing to offer here, however, the K9AY loop performance on bands other
than 160 is something That I have had some success with. At present I have a
broadband matching transformer on my 9AY loop, it works very well on 160and 80.
My first attempt at a K9AY loop was different. I put the loop up and instead
of using the matching transformer I used an SGC auto antenna tuner for
matching. This actually worked very well, the performance on 160 was all I had
hoped
for. The performance on 10-20 meters was pretty darn good, that was somewhat
of a surprise. The performance did drop a bit by the time I got to 30 and 40
meters but wasn't all that bad. How well did it work? My first attempt to use
it was on 17 meters, a simple 100 watt 3X3 Cq was answered by three stations,
4X4, HB9, and a UA3. This was under propagation conditions that could only be
described as great but the fact is the loop used as both a receiving antenna at
low frequencies and as a transmitting antenna at higher frequencies was
pretty good, even under less than ideal conditions. The loop in this
configuration
was directional on 160/80. JA stations off the side of the main lobes were
weaker than on my loaded vertical, New England stations would at times pump my
receiver agc on 160. I have never had another 160 antenna that received this
well. Just my experience with using the 9AY style loop, for what it may be
worth.
Ron KH6DV
Kaneohe Hawaii
|