Posted by
Mike Harris-9 on
Sep 14, 2004; 3:23pm
URL: http://elecraft.85.s1.nabble.com/K2-ATU-question-tp370291p370292.html
G'day,
> I'm using an indoor wire antenna for all bands except 30m, where I'm
testing a
> home built mag loop. The wire antenna is connected to ant #1, the mag
loop to
> ant #2. The mag loop is resonant and doesn't use the ATU, while the wire
> antenna needs the ATU.
> Now each time, I change to 30m, I do have to disable the ATU manually by
> switching it into CALS mode, which is very inconvenient. Alternatively,
I can
> connect a dummy load, tune the ATU into the dummy load on 30m, and then
> reconnect the mag loop. The problem with this second approach is that
after
> accidently tapping tune, I will have to repeat the whole process
(disconnect
> antenna, connect the dummy load, ...).
>
> Since the given setup (having a resonant antenna and another one that
needs
> the ATU) seems pretty common to me, I do assume that there is a simpler
> solution. Is it possible to disable the ATU for one of both antenna
> connectors, or for a specific band? Any other trick to make changing
bands
> simpler?
Can't see the problem. I have a log periodic for 18-30MHz on ant-1 and a
vertical for lower bands on ant-2. It does not matter if the atu stays in
circuit and "tunes" the matched resonant antenna. Just the same as
matching to the dummy load. My vertical is a good 50 ohm match on 10MHz
but I also very occasionally press it into service on 7MHz where the ATU
keeps the PA happy.
Regards,
Mike VP8NO
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