"Duane Calvin" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Short answer: That S9+ signal that is 10 KHz away from you can't be heard
by the radio except when he is transmitting, the noise floor level raises
up. This is easily heard when that signal is CW and you can hear the noise
increase enough to copy the CW via that noise. It can also be heard on a
rig with significant phase noise on transmit. My neighbor (500' away) used
to have a Kenwood TS-430 that had serious phase noise problems on transmit.
If he was within ~100 KHz of me, I could hear my noise floor follow his
signal. I was surprised to find him, one evening, and I didn't hear him
until I was practically on top of him. I asked him a week or so later when
I next saw him if he got a new rig - yep, got a new TS-570. It was
significantly better on transmitted phase noise, and I was happy. (My Orion
doesn't have any distinguishable phase noise issues.)
I guess that wasn't as short an answer as I had intended. FWIW.
73, Duane
Duane Calvin, AC5AA
Austin, Texas
www.ac5aa.com
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Ron Wagner
Sent: Tuesday, June 19, 2007 9:19 PM
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]; recipient list not shown:
Subject: Re: [drakelist] TR7 at FD
Ron Wagner <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Question on the subject of hear/not hear.
Although I know the "book definition" of phase noise. Can anyone describe
to me what it sounds like? I actually have a couple early fully
synthesized rigs here to sell for a friend (one I guess actually noted for
its phase noise). I would like to set them up and listen to hear what I
am "missing" with the TR7 (yes the TR7 has some too, as do all synthesized
signals).
Is it simply background noise, or noise modulation/intermod of the
TX/RX signals, or both or ???
Thanks.
Regards,
Ron
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