[NLRS] digital on 144.250

[Chris Elmquist]

On Monday (04/11/2022 at 02:22PM -0500), Mary Brown wrote:
> There is a burst of CW in it about every 5-10 minutes, to fast for me to
> copy... wondering if this is APRS? Winlink? I am not familiar with the
> modulation either...

APRS would be AFSK same as packet like you'd hear on 144.390 FM.

I think I copy the ping as "HI"  .... ..

There is a narrow multi-tonal (but fewer tones) burst about 200 Hz wide
just before the 2 KHz one.

Good chance it's amateur and not commercial though so that's good.
Probably someone experimenting which I'm all in favor of.

If someone can copy the CW that would cool but that's not me either.

Chris NØJCF

> 
> -----Original Message-----
> From: Chris Elmquist [mailto:chrise at pobox.com]
> Sent: Monday, April 11, 2022 2:17 PM
> To: Mary Brown
> Cc: 'NLRS Reflector'
> Subject: Re: [NLRS] digital on 144.250
> 
> On Monday (04/11/2022 at 01:34PM -0500), Mary Brown wrote:
> > Someone is running some form of digital on 144.250. suspect winlink maybe?
> > 90 degrees from EN24ho.
> 
> Copying it here (@ 19:16 UTC) at about S5 on a vertically polarized,
> unity gain, discone antenna.   I don't recognize the modulation either
> and don't currently have plumbing from this receiver to anything that could
> attempt to decode.
> 
> Seems to be centered at 144.251.750 according to my IC-R8600 which is phase
> locked to GPSDO reference.
> 
> There may be two stations, one is weaker at about S3 and issues periodic
> "pings" and then the louder one responds with a wider bandwidth multi-tonal
> modulation that's about 2 KHz wide, 1 KHz each side of the above center.
> 
> Chris NØJCF
> --
> Chris Elmquist
> 
> 
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-- 
Chris Elmquist