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Re: LF: 137.7770 kHz

To: <[email protected]>
Subject: Re: LF: 137.7770 kHz
From: "Markus Vester" <[email protected]>
Date: Sun, 2 Jun 2013 12:13:35 +0200
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Hi Joe,
 
your QRSS signal was visible on my grabber last night, best between 2:16 and 2:40. As Stefan noted, SNR was somewhat lower than it used to be, but this may be
due to conditions, or my RX being on the auxiliary "summer antenna" which is more affected by ADSL noise from buried telcom cables.
 
Regarding ultimate stability, the blue trace still appeared somewhat fuzzy in the top part of the 0.438 mHz grabber window. Last night, your frequency seemed to be spread between 137777.02 to 137777.04 Hz. Ideally, a perfectly coherent AM modulated signal should have a narrow and straight central line, with modulation sidebands spread symmetrically around it like fish bones. So you may still have a tiny bit of chirp or some phase glitches. Of course this is only relevant for receiver applications that integrate across several dashes (like the Opera correlation project), but it will in no way affect the look or readability in "normal" QRSS spectrograms.
 
Best 73, and thanks for the signal,
 
Markus (DF6NM)
 
 
Sent: Sunday, June 02, 2013 12:24 AM
Subject: LF: 137.7770 kHz

Dear Group,

QRV again tonight.  QRSS30 and seeking comments (especially unfavourable ones) on accuracy, drift and keying coherence.

Vern's grabber is capturing them well at the moment.  Thanks again, Vern.


73
Joe VO1NA
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