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LF: DCF sidebands

To: <[email protected]>
Subject: LF: DCF sidebands
From: "Markus Vester" <[email protected]>
Date: Sat, 10 Sep 2011 12:50:39 +0200
Importance: Normal
References: <[email protected]> <464F4937AE664E8AA5869E5FB3207048@JimPC>
Reply-to: [email protected]
Sender: [email protected]
Dear Jim, LF,
 
yes, life here (especially in DL) would also be much easier if we decided to gather around the DCF39 nulls. There are minima near 137.53, 137.57, 137.73, 137.77 (ie a few Hz below the TA waterhole). My current workaround is setting the noise blanker threshold to trigger on every FSK transition, but the disadvantage is that this creates ugly 0.1 Hz spaced sidebands around strong signals.
 
Best 73,
Markus (DF6NM)
Sent: Saturday, September 10, 2011 12:03 PM
Subject: LF: Re: M0BMU / DD7PC / DK7FC

Dear Stefan, Marco, LF Group,

Yes... I started calling CQ on 137650Hz and then saw DD7PC ("M" copy) and
replied, but perhaps Marco uses a narrower spectrogram window than I do...
The reason for this frequency was that there is a null in the amplitude of
DCF39's sidebands at about 137.64kHz, so received SNR is considerably better
at this slightly lower frequency - Marco would have been "O" copy if he was
using the lower frequency.

I also heard DK7FC RST 559 working DD7PC (not audible) on 136.5kHz. I tried
calling in CW also, but apparently the noise level is too high.

Cheers, Jim Moritz
73 de M0BMU


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