Isn't it local to the radio? That is, isn't the current design causing the
problem?
Edwin Marzan
AB2VW
From: "Mark Amos" <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
To: "Tim Ellison" <[EMAIL PROTECTED]>, "Edwin Marzan"
<[EMAIL PROTECTED]>, [EMAIL PROTECTED],
[EMAIL PROTECTED], flexradio@flex-radio.biz
Subject: Re: [Flexradio] Interesting noise
Date: Tue, 29 May 2007 20:17:25 +0000
I would think that if this were a switching supply artifact it would occur
more regularly (or at least more frequently)...
Incidentally, I have also seen that "travelling hump" artifact and assumed
that it was local (to the radio).
Thanks for the info on cleaning up the DC-DC converter - sounds like a good
thing to do regardless and if it gets rid of the "travelling hump", great.
I suspect that the "spreading" noise that I mentioned below at the start of
this thread is something else, but if it goes away when I clean up the
DC-DC supply issue - even better!
Mark
-----Original Message-----
From: Tim Ellison [mailto:[EMAIL PROTECTED]
Sent: Tuesday, May 29, 2007 02:52 PM
To: 'Edwin Marzan', [EMAIL PROTECTED], [EMAIL PROTECTED],
flexradio@flex-radio.biz
Subject: RE: [Flexradio] Interesting noise
This is a well known artifact and been discussed on the reflector. It
is noise from the DC-DC converter in the radio.
Here is a Reflector archive search on the topic
http://www.mail-archive.com/search?l=flexradio%40flex-radio.biz&q=dc-dc
Here is a KB articles that address how to clean up DC-DC converter
noise.
http://kb.flex-radio.com/article.aspx?id=10276
-Tim
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Edwin Marzan
Sent: Tuesday, May 29, 2007 2:24 PM
To: [EMAIL PROTECTED]; [EMAIL PROTECTED];
flexradio@flex-radio.biz
Subject: Re: [Flexradio] Interesting noise
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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