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

Nathan West nate.ewest at gmail.com
Thu Mar 24 20:40:20 EDT 2022


That’s interesting Andy. I probably live much closer than you to Goddard
and can take an SDR up there for recording if you’d like.

I no longer have access to the field Fox but did look for it from a high
rooftop in rosslyn and couldn’t find the beacon.

On Thu, Mar 24, 2022 at 8:36 PM Andrew Clegg <andrew_w_clegg at hotmail.com>
wrote:

> Better late than never -- this evening I had nothing better to do and I
> drove up to Goddard to see if the 401.25 MHz DORIS signal is in fact coming
> from there. It is very strong on the perimeter of the Goddard facility, so
> it's very likely that it is. Best reception is in USB mode, tuned to
> 401.2495 MHz (500 Hz below the carrier). I did not have a receiver capable
> of 2036.25 MHz in the car to listen for the other frequency. Maybe I'll do
> that another time.
>
> 73,
> Andy
>
> ------------------------------
> *From:* scan-dc-bounces at mailman.qth.net <scan-dc-bounces at mailman.qth.net>
> on behalf of Andrew Clegg <andrew_w_clegg at hotmail.com>
> *Sent:* Friday, April 2, 2021 8:46 AM
> *To:* Larry Kumjian <larry51 at aol.com>; nateewest at gmail.com <
> nateewest at gmail.com>
> *Cc:* Scan-DC at mailman.qth.net <scan-dc at mailman.qth.net>
> *Subject:* Re: [Scan-DC] 401.25 MHz DORIS beacon coming from Goddard or
> somewhere else?
>
> Nathan -- Yes, still there! On the Fieldfox you'll want to zoom in on
> 401.25 MHz. A span of 50 kHz (or so) or less should allow you to clearly
> see the sidebands created by the digital modulation burst every ten seconds.
>
> Larry -- it doesn't appear there's a DORIS tx site in the Hampton Roads
> area. Thanks for checking!
>
>
> ________________________________
> From: Nathan West <nate.ewest at gmail.com>
> Sent: Thursday, April 1, 2021 10:05 PM
> To: Larry Kumjian <larry51 at aol.com>
> Cc: Andrew Clegg <andrew_w_clegg at hotmail.com>; Scan-DC at mailman.qth.net <
> scan-dc at mailman.qth.net>
> Subject: Re: [Scan-DC] 401.25 MHz DORIS beacon coming from Goddard or
> somewhere else?
>
> 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<mailto: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>
> [
> mailto:scan-dc-bounces at mailman.qth.net<mailto:scan-dc-bounces at mailman.qth.net
> <scan-dc-bounces at mailman.qth.net%3Cmailto: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<mailto: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<
> https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.sirgas.org%2Ffileadmin%2Fdocs%2FGGRF_Wksp%2F26_Soudarin_et_al_2019&amp;data=04%7C01%7C%7C7874bf19095b40f174ff08d8f5d5676e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637529644196868819%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=RWhMbu5OkZnPfLMcWrZF4A8cGuDsStdW9BUiLAFknPI%3D&amp;reserved=0
> _DORIS_and_IDS.pdf<
> https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.sirgas.org%2Ffileadmin%2Fdocs%2FGGRF_Wksp%2F26_Soudarin_et_al_2019_DORIS_and_IDS.pdf&amp;data=04%7C01%7C%7C7874bf19095b40f174ff08d8f5d5676e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637529644196868819%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=9lo0g3eGl40V8r6TfnxlNpdet0ewCSUsAMFj%2FJ1cS54%3D&amp;reserved=0>>
> 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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