[Scan-DC] 401.25 MHz DORIS beacon coming from Goddard or somewhere else?

[Nathan West]

Is it still active? I’ve got a couple of good vantage points in Roslyn I
can check from tomorrow with a fieldfox and gr-fosphor.

On Wed, Mar 31, 2021 at 7:25 PM Larry Kumjian via Scan-DC <
scan-dc at mailman.qth.net> wrote:

> For what it's worth, I tried monitoring 401.25 MHz down here in Hampton
> Roads with negative results.
>
> -----Original Message-----
> From: scan-dc-bounces at mailman.qth.net
> [mailto:scan-dc-bounces at mailman.qth.net] On Behalf Of Andrew Clegg
> Sent: Wednesday, March 31, 2021 8:44 AM
> To: Scan-DC at mailman.qth.net
> Subject: [Scan-DC] 401.25 MHz DORIS beacon coming from Goddard or somewhere
> else?
>
> Hi all,
>
> I notice a beacon on 401.25 MHz that, based on its characteristics, seems
> to
> be part of the DORIS
> system<
> http://www.sirgas.org/fileadmin/docs/GGRF_Wksp/26_Soudarin_et_al_2019
> _DORIS_and_IDS.pdf
> <http://www.sirgas.org/fileadmin/docs/GGRF_Wksp/26_Soudarin_et_al_2019_DORIS_and_IDS.pdf>>
> of ground-based beacons that help satellites in orbit
> determine their position to very high accuracy. It's sort of a reverse GPS
> (ground-to-space). The beacon is a CW tone, with a 0.8 second data burst
> every ten seconds, at 1 second before each ten seconds (i.e., 9 seconds, 19
> seconds, 29 seconds, etc., past the minute).
>
> I am in Arlington and the closest official DORIS tx site I see listed is at
> Goddard. Seems kind of far away for me to be hearing it pretty clearly in
> Arlington, especially if it's designed to point up.
>
> Is anyone located near Goddard and could see if there is a signal that fits
> this description that's very strong there? Or do other people hear this in
> areas that are not near Goddard? I think you'd need a receiver that can do
> CW or SSB mode to be able to hear it.
>
> DORIS also transmits on 2036.25 MHz but I can't hear that here, although I
> do hear a constant weak CW tone about 10 kHz off that frequency, but no
> data
> burst.
>
> (Apologies if this is too wonky, but I think it's cool finding exotic
> signals on the airwaves!)
>
> 73,
> Andy
> W4JE
>
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