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[CQ-Contest] SO2R and broadband noise

To: cq-contest@contesting.com
Subject: [CQ-Contest] SO2R and broadband noise
From: Dick Frey - K4XU <k4xu@arrl.net>
Date: Fri, 06 Jan 2006 19:43:48 -0800
List-post: <mailto:cq-contest@contesting.com>
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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