OK, 145.410 MHz. I should have read ALL the posts before asking that. Is
there anything in your area on 157.875 MHz? Those could mix to end up on
132.945 MHz. Same with something on 139.180 MHz, although that us much
less likely, I think.
What is your crystal frequency and multiplication factor? There could be
a lower harmonic causing the problem. The math doesn't seem to support
that, though.
Joe M.
mch wrote:
>
> What frequency is your repeater on?
>
> Joe M.
>
> Mathew Quaife wrote:
> >
> > Ok, the situation is that my repeater is being heard by commercial
> > aircraft on 132.950 Mhz. At first they was able to identify one user
> > of the system, this was in June. Then again the repeater was heard on
> > June 22, this time stating they could hear several users on the system.
> > The did not give any other specifics other than this. This comes from
> > Pilots whom reported the occurance with the FAA in Chicago. I'm told
> > the interference is only to the planes, and not the ground tower.
> > I've looked at the transmitter on the SA, there is one small spur
> > there, but this same spur is there if I use just an ht, or any other
> > radio for that matter. This is hooking it to the repeater antenna
> > directly, or through the duplexer's. My question is, could it be
> > something in the antenna system, or where might I look. My system
> > consist of a DB224 retuned for the ham bands, up 92' fed with 7/8"
> > hardline. There is two horizontal antenna's below the repeater
> > antenna, a cushcraft 5 element 6 meter beam and a Hygain TH7 below
> > that. The tower is a guyed tower, with two sets of guys, one set at
> > 65' and the other at 35'. There is no breaks in the 1/4" steel
> > cables. The deviation on the repeater into my SM only showed 4.5 to 5
> > Khz wide, although the audio was tinny. Over the past few days I have
> > been working on the tinny audio, for which I believe I have fixed, as
> > it sounds much better. The transmitter is the Maggorie Hi Pro EV1 and
> > the amplifier is a Vocom 200 watt amp. 90 Watts is what is being fed
> > to the antenna from the duplexer.
> >
> > Mathew
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
>
>
> Yahoo! Groups Links
>
>
>
>
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