Re: VLF: SAQ Test

[Markus Vester <markusvester@aol.com>]

Good point.

During tuneup, the speed of the alternator is manually adjusted using motor resistors and a frequency counter, but it is never perfectly constant. I have temporarily shifted the zoom on my grabber from NML to SAQ's frequency (see attached screenshot, with colours swapped from blue to green for better visibility). Between several sudden frequency excursions we can see a general upward trend, perfectly matching that in Edgar's spectrogram.

Jan Steinbach from SAQ has sent an email confirming the Sep 28 test transmission.

Best regards,
Markus (DF6NM)

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-----Ursprüngliche Mitteilung-----
Von: hvanesce <hvanesce@comcast.net>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Sa, 29. Sept 2018 5:06
Betreff: RE: VLF: SAQ Test

It looks like the SAQ received signal frequency ramps upward ~ 25 Hz (over the 16:25 – 16:45 UT period) at Edgar’s QTH.

On Peter’s spectrogram I can’t see a frequency change but the resolution of the spectrogram appears to be 100 Hz.

Was the transmitter frequency probably ramping during the test?

 

73,

 

Jim AA5BW  

 

 

From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of markusvester@aol.com
Sent: Friday, September 28, 2018 6:42 PM
To: ejt2@bigpond.com; rsgb_lf_group@blacksheep.org; info@alexander.n.se
Subject: AW: VLF: SAQ Test

 

Yes Edgar thats it, a dash at the right time and frequency.

73, Markus 

------ Originalnachricht------

Von: Edgar

Datum: Sa., 29. Sep. 2018 00:35

An: rsgb_lf_group@blacksheep.org;info@alexander.n.se;

Betreff:Re: VLF: SAQ Test

May be?



Regards, Edgar
Moonah, Tasmania.

 

saqtest_df6nm_180928.jpg
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