Date: Fri, 7 Jun 2013 09:24:33 -0230 (NDT)
From: jcraig@mun.ca
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: 137.7770 kHz
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Markus,

Thank-you for mentioning this problem. If it's QRO -> DDS it's 
likely due to shoddy construction technique by the operator!
When this has been dealt with, we can try some OP32.

73
Joe

On Fri, 7 Jun 2013, Markus Vester wrote:

> Hi Joe,
>
> looks like carrier stability was good while the signal was weak, but deteriorated after 2 UT. DDS affected by QRO?
>
> Best 73,
> Markus (DF6NM)
>
>
>
> From: jcraig@mun.ca
> Sent: Thursday, June 06, 2013 1:34 AM
> To: rsgb_lf_group@blacksheep.org
> Subject: Re: LF: 137.7770 kHz
>
>
> Hi Stefan, Markus and Jean Pierre F1AFJ (Grabber service),
>
> Thanks for the report, Stefan.  I am happy you have something nice to
> say about my sigs. Its good that they are reaching you when we are so
> close to the solstice.
>
> They were also quite strong around that time on Jean Pierre's grabber as
> well.
>
> As for Markus, he provided what I asked for  -- and now I must say his
> very critical report is most gratefully received. :-)  The problem seems to
> have disappeared after the 10 MHz input to the AD9851 was boosted with
> a BJT amp.  The original interface simply offset the 1.5 V p/p
> to 2.5V DC; the new one bosted it to 0-3V which is more in line with
> the specs for the DDS.  Perhaps the chirps and phase glitches were
> due to RF interfering with the weak 10 MHz input.
>
> I will be happy to try OP32 on another frequency soon.
>
> Thank-you very much for the good news and thanks all around.
> The TX is now again QRV on QRSS30. (2330 UTC)
>
> 73
> Joe
>
>

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