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Re: LF: Dirty signal

To: Chris Wilson <[email protected]>
Subject: Re: LF: Dirty signal
From: Chris Wilson <[email protected]>
Date: Mon, 25 Apr 2016 13:03:24 +0100
In-reply-to: <[email protected]>
Organization: Gatesgarth Developments
References: <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
Hello LF 'ers

Monday, April 25, 2016

Best regards,
 Chris  2E0ILY                          mailto:[email protected]

> 25 April 2016

> Had a report that my LF WSPR2 signal was dirty with massive side bands
> on Sunday. I had a look at my setup today found Windows had decided to
> up the audio level from WSPR to maximum into the TS-590 and scoping
> the output of the pre amp and frequency doubler before my G3YXM amp
> showed it looking very ropey indeed.

> I reset it and did a couple of normal WSPR2 transmissions interspersed
> with using the WSPR TUNE function, whilst watching on the G3XXM and
> G4WGT LF grabbers. I am no expert whatsoever, but it doesn't look bad
> now to me. Is this an adequate test to make and to assume things are
> now OK? Thanks.

> Screenshots are at

I  managed  to  get a few more minutes on this, and now my SA is fixed
and calibrated I thought some SA screen shots would be useful. I stuck
a  small  rubber duck antenna in the input port and looked at my signal
in  real  time  off  my normal TX antenna whilst actually transmitting
WSPR2.  Tried  with  2  frequency  spans.  Also  took  photos  of  the
scopematch  showing a good V /I balance, and the amp meter set to show
reflected power, which all but nothing. Am I clean....? :)

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