Summary so far-
That extra can did nothing for solving the interference. It still came
through later that day. Here are the facts:
1. I can hear the interference on the repeater reciever, an Icom 2710 dual
bander, and a Motorola GP-300 portable- all while the repeater transmitter is
not keyed up.
2. I ran all the possible frequencies in the area through the intermod
calculator and came up with nothing.
3. I watched the carriers on the railroad freqs with a spectrum analyzer on
site several times. There is quite a bit of activity going on all the time
across all the frequencies I listed in a previous post. I'm assuming all the
locomotives have these tx's in them, and the yard nearby is a locomotive repair
shop next to the main yard. At any one time there's 20-30 locomotives sitting
around that part of the yard. I didn't see anything at the time spuring on my
input frequency. It might have been just hard to see- they are quick bursts of
data packets and the spur may have been down too far for my analyzer to recieve
(Sencore).
What's intresting is that the interference disappeared all of the sudden
that day. I went back over with the spectrum analyzer and basically saw the
same pattern of activity, but no interference coming through on any recievers.
It has been quiet ever since. Best guess I can come up with is that one of
the locomotives has a bad radio and it has moved on down the line. It's hard to
troubleshoot what's not there.
So hopefully it's gone for good. If not, to be continued......
Tom
W9SRV
Nate Duehr <[EMAIL PROTECTED]> wrote:
On May 24, 2007, at 8:40 AM, TGundo 2003 wrote:
> I tuned up the extra can I have as best I could with the probes I
> have, figuring something is better than nothing). I could get abour
> 30dB of isolation through it with about 1db of loss on my RX freq.
> I put it in-line after the rx cans on the duplexer and it seemed to
> have stopped the interference (at least fot the 15 minutes I
> listened afterwards). We'll see if this does the trick. I would
> like to install an Advanced Receiver Reasearch preamp I have
> sitting waiting for it, but I need to get this interference
> resolved first.
Still quiet after a few days, Tom? Just curious how it worked out.
--
Nate Duehr, WY0X
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