I've never been concerned about a SWR of 3:1 or less on HF. Even with a
3:1 SWR, depending on feed line loss, most of the power is reflected
back to the antenna and is radiated. Now if the length of feedline has
3 dB of loss at the given frequency, then approximately 1/2 of the
reflected power arrives back at the antenna. Hence the reason to use
good to very good low loss feedline.
73
Bob, K4TAX
K3S #10163
On 6/9/2017 3:55 PM, stan levandowski wrote:
When following the instruction in the KXAT1 manual and using a wire
between 24-28 feet and a 16' counterpoise for 40 and an 8'
counterpoise for 20, the best I can ever get is a 1.6 SWR on 20 and
2.8 SWR on 40.
I've spent lots of time shortening and lengthening wires and writing
down results and I can't hit the magic combination.
The manual also makes it clear on page 8 that a 1:1 SWR is NOT
necessary for good performance. I believe this because the little KX1
makes me plenty of contacts with this setup, including DX.
I suppose I could just be happy....
However, it bothers me that these SWRs are the best I can do. I don't
like seeing these high ratios on the display. I built this KX1 but
had Don Wilhelm build and install the 30/80 module for me. As part of
his service, he went over my KX1 and told me that it was up to spec.
So my question is: Has any KX1 user out there figured out a wire
length, length and number of counterpoises, etc. that gives a better
match with the KXAT1's capabilities??
When I say I use a wire, I mean I throw it up into a tree and get it
as vertical and possible, then I lay out the counterpoise wires and it
all attaches directly to the KX1 with a dual binding post. Just real
simple!
Thanks for any words of advice and 73,
Stan WB2LQF
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