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[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Tony KT9AC
Sent: Monday, 22 February 2010 08:53 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Can the 4th harmonic of 1250 AM keep UHF
repeaters locked up?
Thanks Jeff. The AM station has the same power both day and night,
If you have a spectrum analyzer, look at the receiver pass side of the
duplexer, you should see the garbage come up as soon as the
transmitter keys. Also if you do not modulate the repeater the
garbage should be decode able with a radio such as the Kenwood TH-F6
or Yaesu VX-7 set to AM mode tuned
Thanks Jeff. The AM station has the same power both day and night, just
goes from 2 towers to 4 to change the pattern.
Rusty bolt or fence line etc seems the most likely. The problem does
seem to disappear when its raining out, which helps verify this theory.
It might be a needle in a haystack
> So, if we take the 1250Khz signal or 1.25Mhz x 4 = 5Mhz. I
> realize that
> the 4th harmonic of a 5KW broadcast station isn't very powerful
Well...it *shouldn't* be very strong. It has to be attenuated 43 + 10 * log
(Pwatts) as measured in the field (not at the transmitter output terminals).
Hi everyone,
A while ago I was troubleshooting a bad feedback or "growl" problem
that was impacting a UHF repeater, of which the short term workaround
was to not encode TX PL (PL or DPL would keep it locked until the signal
dropped enough or timed out).
In doing some more research, I found a
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