Hi folks, first thanks to the guys who responded to my previous query on
the Z match. Well I built the thing and it works (the one shown on this
site
http://www4.tpgi.com.au/users/ldbutler/SingleCoilZMatch.htm). But here
are some questions for you experts:
I am using a 130 feet end fed wire with a counterpoise (not sure how long
it is) and have managed a reasonable match (1.5 or less SWR) on
80/40/30/20. The tuning is very sharp and I will be looking for slow motion
drives for the variable caps. My main query is what is the best procedure
for finding the match, it's been a bit hit and miss so far. I think the
best way is first set both caps for best rx, then with the K1 set for 5W,
key the K1 adjust the main tuning cap for max output (measured by my
power/swr meter between the K1 and the tuner) , then adjust the other cap
for minimum SWR, then back to the main tuning cap for max power and so
on................. Have I got this right? I seem to get close with this
technique but it doesn't always find the right settings and I spend many
minutes trying this and that (and heating up the K1 output!). Also quite
often the power and K1 current draw shoots right up (up to 2 amps) and at
other times the K1 output seems to drop (is this the K1 protecting itself
due to high SWR?). Eventually I will get some vernier drives and make a
note of the exact settings but maybe I'm not using the best technique. This
is the first tuner I have built so I'm feeling my way a bit.
Any hints would be most appreciated.
73's
Martin
M0KWV
K1 #1534
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