I've seen something similar on my panadaptor as well. I refer to it as a
crawling hump. It happens with and without the coaxial cable attached to the
radio. The Spur Reduction button seems to manipulate it enough to keep it
out of the receive filter bandwith. Because it can be manipulated as such, I
thought it may have to do with the radio's DDS.
Edwin Marzan
AB2VW
From: BILL GUYGER <[EMAIL PROTECTED]>
To: Mark Amos <[EMAIL PROTECTED]>, flexradio <flexradio@flex-radio.biz>
Subject: Re: [Flexradio] Interesting noise
Date: Mon, 28 May 2007 11:29:48 -0700 (PDT)
I've seen something like this before, not in this "application" however, it
was interference to a broadcast RPU link on 161 Mhz. It turned out to be a
data link from an installation that is either a sewer lift pump station for
the city of Grand Prarie, TX., or a hydrological station associated with
the Trinity river. It would appear on the spectrum analyzer spread out with
pronounced peaks within the over all envelope go away and reoccur at
intervals similar to what you describe.
So it MAY be a data link of some kind but then again????
Bill AD5OL
----- Original Message ----
From: Mark Amos <[EMAIL PROTECTED]>
To: flexradio <flexradio@flex-radio.biz>
Sent: Monday, May 28, 2007 7:02:59 AM
Subject: [Flexradio] Interesting noise
Folks,
I have seen some unusual noises on the panadapter again this morning and
wondered if anyone else has seen this. I've seen this before, usually in
the morning, as I recall. I'm just wondering if they are a local noise
(either in the shack or nearby) or if other people have seen them.
Here's a description:
Noise floor (today at about -120) drops a couple of DB's
A blob of noise comes up from the floor and spreads symmetrically,
sometimes
dissipating as it goes, other times stopping at a certain width and hanging
there for a few seconds. This process takes a few seconds. The pattern
recurs in intervals of 10 to 20 seconds for a half-dozen repetitions then
stops for an indeterminate period before coming back. It can go on for
some
time, but eventually subsides.
I've got a couple of AVI movies of a portion of the panadapter when this is
happening and an I/Q recording of the phenomenon if anyone would like to
see
it.
Anyway, just interested to know if anyone else has seen this interesting
noise pattern and thoughts on what it is.
Mark
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