Shane
'Jeff DePolo' <[EMAIL PROTECTED]> wrote:
> Yes, I was using the Top Half of a 4-element antenna. I have
> now added the 3-Way connector and now have the entire antenna
> connected.
> I have noticed it has cleaned up the receive on week stations
> but, it seems to have dropped a little in the signal.
>
> System was just re-tuned, duplexers and radios. It's a
> Motorola MSR-2000 Canadian 40 Watt version. When I add the
> duplexers and the top half of the antenna I get 25 Watts out.
> When I add the second half I get 10 Watts out. Measuring
> the wattage just after the duplexers.
This doesn't make sense. The transmitter output shouldn't be changing.
It sounds to me like when the second set of bays was connected it wasn't
done with a proper matching/phasing harness, but rather just by "teeing"
the two halfs together. This would throw the match off (a 2:1 VSWR
mismatch best-case), which results in a detuning effect at the duplexer
which makes its insertion loss go up, which is why you're seeing less
TPO. Have you measured the reflected power at the antenna both before
and after adding the second set of bays (or if you can't measure at the
antenna, measure at the output of the duplexer and tell us what kind/how
long your feedline is and we can back-calculate from that).
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