Pete,
This is the phase noise of the 930's LO, plus the amplified noise figure of the
transmitter stages all the way back to the carrier generator. Because it goes
out through the Tx LPF you will find it more on frequencies below the band it's
on.
73, Dick
Message: 5
Date: Fri, 06 Jan 2006 14:13:50 -0500
From: Pete Smith <n4zr@contesting.com>
Subject: [CQ-Contest] SO2R and broadband noise
To: cq-contest@contesting.com
Message-ID: <6.2.0.14.2.20060106140800.0c730150@mail.adelphia.net>
Content-Type: text/plain; charset="us-ascii"
I have been doing some tests with my new single-tower SO2R setup, transmitting
on a TS-930S and listening on a Mark 5.
Results so far are very gratifying. I have noticed, though, that regardless of
band, when I have the TS-930 in transmit, but not key-down, I can hear a slight
increase in the noise floor on the Mark 5. The amount of increase is
subjectively the same, whatever band I'm listening on, and does *not* change
between key up and key down.
I'd characterize this as a nuisance, and probably not an operational problem
under extreme weak-signal conditions, but I'm curious what could be causing it.
Any thoughts?
73, Pete N4ZR
The World HF Contest Station Database
Full details on 3085 contest stations
at http://www.pvrc.org/WCSD/WCSDsearch.htm
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