Date: Sun, 6 Dec 2015 14:50:08 +0000
From: Chris Wilson <chris@chriswilson.tv>
Organization: Gatesgarth Developments
Message-ID: <774697463.20151206145008@chriswilson.tv>
To: Paul Nicholson <rsgb_lf_group@blacksheep.org>
In-Reply-To: <5664461D.5010501@abelian.org>
References: <18682173.20151206131730@chriswilson.tv> <5664461D.5010501@abelian.org>
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Subject: Re[2]: LF: Is this frequency locking enough for EbNaut?
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Status: O

Hello Paul,

Sunday, December 6, 2015


Hi  Paul,  thanks  for your detailed reply. Taking things in the order
below,  the  590  has a built in USB sound card that i use for digital
modes, but i need to look and think what access SL needs to it. I also
have  a couple of internal sound cards for the PC, Delta 44 ones, which
were  / are highly rated, but my main shack PC is running Windows 7 64
bit  and  the  drivers  for this OS are buggy as hell and all sorts of
distortion  is  apparent even to the ear, and certainly when using for
IQ SDR work. These cards were great under XP though.

I  hope  to  get  on air on 136 later, but one of the dogs knocked the
wheelie  bin with my matching coil in it and the variometer shifted in
the fall. I knew I shouldn't have left marking its position, I have to
fiddle  about  getting it set again. Hopefully I will have remote tune
soon,  one  board  to assemble and some machine shop work on the motor
drive.


I  will  post  again  if  I get on LF and you can tell me if there's a
convenient time for me to send a carrier, much appreciated Paul.


> 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
> --


-- 
Best regards,
 Chris  2E0ILY                          mailto:chris@chriswilson.tv