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Re: LF: VLF exciter / signal generation in Spectrum Lab

To: [email protected]
Subject: Re: LF: VLF exciter / signal generation in Spectrum Lab
From: wolf_dl4yhf <[email protected]>
Date: Sun, 29 Dec 2013 13:31:55 +0100
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Hello Markus, Stefan, and the group,


Am 29.12.2013 12:42, schrieb Markus Vester:
One channel sends a continuous uninterrupted 17.94 kHz tone to the divider, the other channel conveys modulated Opera at an arbitrary frequency to a VOX rectifier.

Indeed, this option is now selectable in SL by selecting 'Auxiliary output: unmodulated coherent carrier' on the digimode configuration screen. Details at

http://www.qsl.net/dl4yhf/speclab/digiterm.htm#adv_settings

I only checked it with ASK (amplitude shift keying) yet but it should work with PSK too. Would be an interesting experiment to send Opera-encoded bitstreams as binary PSK... :o) if we already had an optimized decoder for it.

The problem with very long commands (to send blocks of data through the digimode terminal), as noted by Stefan, has now been fixed. The string of "zeroes and ones" can be up to 1023 characters long now.

V2.79 b9 can be downloaded from
 http://dl4yhf.ssl7.com/speclab/install_speclab.zip

Please keep a copy of your 'working' version because not all of the new functions in SL have been properly tested yet, and there may be a couple of bugs lurking in less frequently used subroutines.

73,
  Wolf .

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