Hi Kyle, sorry long delay - work issues in the office -
Basically, connect a balanced feedline (openwire, ladderline) but NOT
coax to the ATU. One side to the wire connector, the other to ground.
I have to tell you, this works REALLY well, and can tune up on all
bands. I don't own or have access to antenna analyser, or GDO, or
regular tuner like MFJ (YET!) but I've seen other posts about using
loops and thought I'd try it -worst that could happen is that you
can't tune, and next worst is that you burn all yr power in the tuner-
In reality, the horizontal loop *should* have impedance between 102
and a few hundreds of ohms - but if the loop isn't resonant then its
a problem. (Thats what I had to start with).
The loop is now close to 270ft (81.6 metres) but I still need to trim
it a bit - lack of time still-
I'm going to TRY and post some pictures so lets see if that helps you
see what I'm doing.
Spectrum analyser shows that there's nothing bad going on, and I'm so
far not causing QRM or QRI to anything I can find, even at 100w SSB
on any band from 80-6 (!)
I've also made a smaller version as a tuned loop on 2m to understand
the concept more - without matching, its giving swr 1:1.7 from 144-
146mhz. I'm going to make a 1/4wave 75ohm stub match during next days
to see how low the loop swr really goes when its matched properly,
and to see what the VSWR 1:2 bandwidth is. That will help me
understand whats happening in the bigger HF loop. I'm thinking of
making a tuned loop for dedicated 20m that is 2 wavelengths long and
play with it.... starting with experiments on a 6m loop that is more
manageable!
Cheers
Clive
--- In YaesuTuner@..., Kyle N4NSS <n4nss@...> wrote:
The FC-40 is a wire tuner. what are you doing with the other side
of the 300 ohm line?
Clive <l81ker@...> wrote: Hi folks, after moving to FINLAND where
its very cold now, I put up a
longwire loop of approx 84 metres of wire. Its fed with 300-ohms
radioshack line.
The tuner WON'T tune this on the lower bands (but its fantastic on
20m.)
I'm going to try shortening the loop slightly to around 81m, but
before that has anyone got any advice? Why is the SWR so high for
the
tuner?
Antenna is about 5m up, and the feedline is about 4.5m.
Ground here is solid granite rock... hence the loop!
Cheers
Clve4
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