Re: [rsgb_lf_group] Re: LF: Re: EbNaut test transmission

[Andy Talbot <andy.g4jnt@gmail.com>]

I don't know.  I'm not really a user of Spectrum Lab - its one of those big complex suites of software I don't want to bother having to learn unless absolutely necessary.   I think Wolf was prepared to write a suitable start file (if that's what a .USR one is)

I use my own homebrew LF SDR   and software to generate .WAV files compatible with those needed, which, as of just 30 minutes ago has just been proved to be EbNaut compatible .

Andy

On 17 November 2015 at 17:31, 'Mike Dennison' mike.dennison@ntlworld.com [rsgb_lf_group] <rsgb_lf_group@yahoogroups.co.uk> wrote:

 

Good signal from you Andy despite most of my antenna being on the
ground!

Is there a beginners's guide to receiving? I looked at the ebNaut
Windows software page and it says:

"Spectrum Lab will filter the signal and apply strong sferic
blanking, and take care of timestamping and sample rate drift
correction. It will shift the received signal to baseband and output
a WAV file containing the I/Q channels which the decoder requires."

Does that mean there is a SpecLab USR file for this somewhere?

Mike, G3XDV
==========

> Frequency accuracy is better than that, more like 137780.0000 +/-
> 0.2mHz The DOCXO is staying within a part per billion now the weather
> has gone colder and the house temperature is governed by the central
> heating. That has sort-of turned it into a triple ovenned reference
>
> Andy G4JNT
>
>
> On 17 November 2015 at 14:04, Andy Talbot <andy.g4jnt@gmail.com>
> wrote:
>
> > Mainly as a system test, I'm radiating an EbNaut signal. Details
> > are
> >
> > Frequency 137780.000 +/- 1mHz (DOCXO only for this test)
> > Coding 8K19A
> > Symbol period 0.5s (2 symbols / sec)
> > Message length is 9 characters consisting of a callsign and the
> > abbreviated name of a well-known cockatiel
> >
> > Transmission is on every 10 minutes (although the message itself is
> > just under 6 mins - there is about 4 of plain carrier)
> >
> > Keying is using my soft Gaussian 10ms ramp and pleased to say there
> > is not the slightest click or any sound from the PA or loading coil
> > when it transitions.
> >
> > The PA is set to its minimum setting and in this wet weather the
> > increased antenna resistance is such that that means about 200 Watts
> > of RF, and probably no more than 50mW ERP
> >
> > Andy G4JNT
> >
>
>
>
> -----
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> 11/17/15

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Posted by: "Mike Dennison" <mike.dennison@ntlworld.com>

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