At 4/9/2006 15:25, you wrote:
>It appears that my problem with the 145.410 repeater has begun
>interefering with the aviation frequency again at 132.950. It crept
>out of no where, and the only change that has taken place with the
>repeater is that I moved the entry of the feed line, and shortend the
>jumper that comes inside, which is 3/8" hardline, same as before.
>
>Someone back when all this was going on, mentioned they could build me
>a tuning stub to hopefully make this problem go away. I dont remember
>whom it was, but if anyone can help, I seriously need some help on
>this one, as I hate to have to take the repeater off the air.
>
>I know it is not the exciter, as it has been changed and is now a
>micor. Please Help again.
>
>Mathew
>N9LV
Mathew:
I don't recall all the particulars of the previous thread, but then again
it may be best to start fresh here.
If you already changed the exciter, the problem is either in your RFPA or
not in your repeater (I've yet to see a power supply that could cause a TX
to generate spurs that far away from the carrier).
I'd look at the PA output with a spectrum analyzer to verify the presence
of the spur. If it goes away when the load it's TXing into changes (like
when you disconnect it from the duplexer & connect it to a load), it's
unstable. An isolator on its output should keep it happy, but it probably
needs repair as most commercial amps shouldn't mind TXing directly into a
duplexer.
Bob NO6B
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