Message-ID: <5664461D.5010501@abelian.org>
Date: Sun, 06 Dec 2015 14:28:45 +0000
From: Paul Nicholson <vlf0403@abelian.org>
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Subject: Re: LF: Is this frequency locking enough for EbNaut?
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Chris Wilson 2E0ILY wrote:

 > I have  my  TS-590 transceiver locked to a Trimble
 > Thunderbolt 10MHz reference, using the device from here:
 > http://www.vk3hz.net/XRef/XRef_Home.html#XRef-Vx

Excellent.  And a useful link too.

 > can EbNaut be used with something like the TS-590,

I'm sure it can be used for coherent BPSK, although we'll
have to work out the best way.   You've already done the hard
(and expensive) part with the Thunderbolt (good choice) and
the XRef board.

Others will have better advice because I have no experience
here, but I guess the next step is to digitise the audio
output of the TS-590 through a PC soundcard, along with the
PPS from the Thunderbolt.   This is routinely done with
Spectrum Lab for VLF reception and SL will have a setup file
which uses the PPS to correct the undisciplined soundcard
sample rate.

Transmission is probably easy too via SL with the tx in
SSB mode.  With SL controlling the soundcard rate, it can
output a precise frequency which you can modulate yourself,
or use a built-in modulator in SL.

Then you're geared up to transmit and receive coherent
at LF and HF.  That opens up some territory to explore!

 > is  there, or will there be an idiot's guide to running
 > EbNaut? ;)

SL has some notes on how to capture a received signal into a
wav file for import into the decoder ebnaut-rx.exe

  http://www.qsl.net/dl4yhf/speclab/EbNaut_Rcvr.htm

There's no idiot's guide, it's too new and experimental and
every station running this has done things a different way
making use of whatever tools and techniques they have available.
It's a bit fiddly to set up but nothing fundamentally difficult.

 > is this frequency locking adequate, or how can I
 > tell if it is?

You could transmit an LF carrier with the rig in CW mode
and Markus and I will measure the frequency.  That'll
confirm the TS590 is locked.

--
Paul Nicholson
--