> I have an interesting thing happening on our two meter
> repeater. We have what appears to be a blanking white
> noise that is present on the input. The repeater is a
> split site system with a 440 link from the two meter
> receiver site over to the transmitter site about 2000ft
> away. There are no duplexers in the system to cause problems.
Duplexers cause problems..?
> The link on 440 is clean of any noise, so we are quite
> confident the link is not a problem.
You could easily test the link for proper operation if not
already done.
> On two meters, when a signal is anything less than full
> quiteing, we get a white noise that will almost mask the
> audio. We have tried different receivers such as the GE
> MVS and now a GE Master II. We have removed the preamplifier
> with minimal results.
Have you listened on the receiver frequency with other radios
on different antennas..? even a mobile in front of the
building? Do you have access to another antenna or antenna port
at the same site/location?
> The receivers have excellent sensitivity and the tuning
> process of the receivers is correct. We have also tried
> putting pass cavities ahead of the receiver with no
> appreciable change. The antenna is a DB-224 mounted on
> a broadcast tower just below the bays of an FM broadcast
> commercial transmitter. We have turned OFF the fm broadcast
> transmitter at times to check if perhaps this was the
> problem but no change was noted.
> > ANY IDEAS from anyone???
> > THANKS!
> > Gary - W5GNB
Sure, hang another antenna at ground level and listen to the
frequency for a problem on-channel signal. If it's something
related to the current antenna system, the test antenna would
be a big hint for removing the repeater antenna from the problem
list.
If the problem is an on-channel signal, you might hear it on
the test antenna. If you're able to get away from the building on
the same mountain top... you might be able to figure out if any
problem on-channel signals are sourced from the same building.
... and with a bit of basic DF Homework you could possible source
a problem signal to other locations.
The quesiton: Is a problem on-channel signal near or far?
cheers,
skipp .
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/Repeater-Builder/
<*> To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
