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Re: LF: 137.7770 kHz

To: <[email protected]>
Subject: Re: LF: 137.7770 kHz
From: "Gary - G4WGT" <[email protected]>
Date: Wed, 5 Jun 2013 18:51:07 +0100
In-reply-to: <[email protected]>
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Hi Joe,

Michel's excellent capture of your signal prompted me to check my over-night grabber saves & found your signal showing up for a long period of time from 00:50utc to about 03.30utc on my QRS03 grabber, see attached at 01:40utc. A letter "V" seen at the top of image.

Gary - G4WGT.

----- Original Message ----- From: <[email protected]>
To: <[email protected]>
Sent: Wednesday, June 05, 2013 1:02 PM
Subject: Re: LF: 137.7770 kHz

Thank-you, Michel.

Good conditions and no mention of a chip, nor could I see one
on your spectrum.  Yesterday I changed the TX and hopefully
fixed the chirp and maybe the phase glitches?

There are still bumps (~0.1 Hz) in the spectrum 10 MHz DOCXO output
every few minutes.  They last longer when the osc is less thermally
insulated from the shack, but this is unchanged by putting
a big cap across Vcc (which is unchanging). Could this be the source of the phase instability in the 137 kHz sigs? How about a large AC ripple on the supply to the PA?
73 & tnx

On Wed, 5 Jun 2013, Michel Brunel wrote:

Good conditions tonight,

73,  Michel - f5wk
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Attachment: 137700Hz-1306050140.jpg
Description: JPEG image

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