Dear Joe,
Yes, we have observed the signal with a spectrum analyser. It is a broadband
noise covering our entire TETRA band.
Yes, the transmitter is keyed up continually.
Regarding oscillation, what circuitry will develop the oscillation in 3 days?
We are thinking about the heat problem too, as heat may be developed overtime.
Best Regards,
Kent
--- On Tue, 9/3/10, Joe <k1ike_m...@snet.net> wrote:
From: Joe <k1ike_m...@snet.net>
Subject: Re: [Repeater-Builder] Noise Level on a Duplexer
To: Repeater-Builder@yahoogroups.com
Date: Tuesday, 9 March, 2010, 8:52 PM
Hello Kent,
Have you looked at the noise on a spectrum analyzer? Is is broadbanded
noise, or is it just on your receiver frequencies? If it is only on
specific frequencies, is it frequency stable or does it drift around?
Also, do any of your transmitters stay constantly keyed up?
I'm wondering if something external to your system is oscillating. Your
signals may be causing it to go into self-oscillation. When you shut
your system off it stops. This is just a guess right now.
73, Joe, K1ike
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