[TheList] TheList Digest, Vol 114, Issue 3

Mon Jul 29 16:42:48 AEST 2019

Hello Paul,

Yes please count me in.

Regards,
LeitrhC

On Mon, Jul 29, 2019 at 2:00 PM <thelist-request at radiowiki.org.nz> wrote:

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> Today's Topics:
>
>    1. CCIR FENZ Selcall (Paul Saville)
>    2. Re: CCIR FENZ Selcall (Ryan Warner)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 29 Jul 2019 10:58:59 +1200
> From: Paul Saville <radiowiki-25ef7a4b868b6000 at ephemeral.nz>
> To: thelist at radiowiki.org.nz
> Subject: [TheList] CCIR FENZ Selcall
> Message-ID: <18c04209-6926-4b98-76cd-547f0c9f37c3 at ephemeral.nz>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> Last Christmas holidays I came across an old post about NZFS selcall
> signalling:
>
> http://radiowiki.org.nz/pipermail/thelist_radiowiki.org.nz/2010-December/001033.html
> .
> That piqued my interest, and after figuring out that it is a variant of
> CCIR
> selcall, and 6 months of tinkering, I have a Windows command line
> program that
> uses audio dsp methods to decode the tones reasonably consistently.
>
> Is there anyone on this list who would be interested in helping with
> some testing?
>
> Development work has been done in Christchurch. I think it should work
> nationally
> but I haven't had the opportunity to test it anywhere else.
>
> You would need a Windows 7 or later PC, 64-bit, with a sound card that
> supports
> 48000 samples per second 16 bit mono. The program takes audio from the
> default recording device configured in your Windows settings. It is
> designed to
> use direct discriminator output from your receiver however it will work
> with a
> speaker or headphone connection (but take care to avoid clipping).
>
> Just to be clear, the program doesn't give direct information about
> which fire
> appliance is doing what, etc. It simply decodes the tone groups to their
> CCIR
> tone symbols. Output looks like this (it writes to stdout):
>
> CDB31FFF1400C
> C5DB3__44
> CDB31FFF1325C
> C5DB3__33
> CDCC1FFF1C00C
> C5DCC__CC
>
> I leave it as an exercise for the reader to write a script or program that
> converts the symbol groups into appliance name and status and so on. A
> python
> script using regexes would be a good approach I reckon.
>
> The current release also writes a raw PCM output file of the captured
> audio.
> I have found this useful for debugging tone groups that fail to decode. You
> will need some disk space to accommodate this file.
>
> Technically an analogue 24 kHz anti-aliasing filter is required. I am
> using the
> data connector on a Kenwood TM-G707 which works well without an
> anti-aliasing
> filter, but your mileage may vary.
>
> If you would like to try out the program please contact me directly by
> e-mail
> and I will e-mail a copy back to you. I am not distributing the source
> code at
> present; just the executable.
>
> Cheers,
> Paul
>
>
>
>
> ------------------------------
>
> Message: 2
> Date: Mon, 29 Jul 2019 12:18:03 +1200
> From: Ryan Warner <ryan at capten.co.nz>
> To: thelist at radiowiki.org.nz
> Subject: Re: [TheList] CCIR FENZ Selcall
> Message-ID:
>         <CAB9oKp=5M2GxLO7AoM7eWBVyQohsT6NA8Qcp=9F8=
> 2hC2xKqcA at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hi Paul,
>
> I emailed you at the address from radio wiki, but not sure if it is
> correct.
>
> Regards,
>
> On Mon, Jul 29, 2019 at 11:00 AM Paul Saville <
> radiowiki-25ef7a4b868b6000 at ephemeral.nz> wrote:
>
> > Last Christmas holidays I came across an old post about NZFS selcall
> > signalling:
> >
> >
> http://radiowiki.org.nz/pipermail/thelist_radiowiki.org.nz/2010-December/001033.html
> > .
> > That piqued my interest, and after figuring out that it is a variant of
> > CCIR
> > selcall, and 6 months of tinkering, I have a Windows command line
> > program that
> > uses audio dsp methods to decode the tones reasonably consistently.
> >
> > Is there anyone on this list who would be interested in helping with
> > some testing?
> >
> > Development work has been done in Christchurch. I think it should work
> > nationally
> > but I haven't had the opportunity to test it anywhere else.
> >
> > You would need a Windows 7 or later PC, 64-bit, with a sound card that
> > supports
> > 48000 samples per second 16 bit mono. The program takes audio from the
> > default recording device configured in your Windows settings. It is
> > designed to
> > use direct discriminator output from your receiver however it will work
> > with a
> > speaker or headphone connection (but take care to avoid clipping).
> >
> > Just to be clear, the program doesn't give direct information about
> > which fire
> > appliance is doing what, etc. It simply decodes the tone groups to their
> > CCIR
> > tone symbols. Output looks like this (it writes to stdout):
> >
> > CDB31FFF1400C
> > C5DB3__44
> > CDB31FFF1325C
> > C5DB3__33
> > CDCC1FFF1C00C
> > C5DCC__CC
> >
> > I leave it as an exercise for the reader to write a script or program
> that
> > converts the symbol groups into appliance name and status and so on. A
> > python
> > script using regexes would be a good approach I reckon.
> >
> > The current release also writes a raw PCM output file of the captured
> > audio.
> > I have found this useful for debugging tone groups that fail to decode.
> You
> > will need some disk space to accommodate this file.
> >
> > Technically an analogue 24 kHz anti-aliasing filter is required. I am
> > using the
> > data connector on a Kenwood TM-G707 which works well without an
> > anti-aliasing
> > filter, but your mileage may vary.
> >
> > If you would like to try out the program please contact me directly by
> > e-mail
> > and I will e-mail a copy back to you. I am not distributing the source
> > code at
> > present; just the executable.
> >
> > Cheers,
> > Paul
> >
> >
> > _______________________________________________
> > TheList mailing list
> > TheList at radiowiki.org.nz
> > http://radiowiki.org.nz/mailman/listinfo/thelist_radiowiki.org.nz
> >
>
>
> --
> Ryan Warner
> ZL1RKW
> Mobile: +64 27 748 9062
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