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Re: [time-nuts] Receiving the MSF time signal on cheap radio modules

HM
Hal Murray
Tue, Feb 6, 2018 10:57 PM

Since MSF is on 60 KHz, you do indeed get dead spots.

If the two signals are not encoded identically, there should be an
interesting signal when one of the transmitters is off and the other is on.
Has anybody looked for that sort of pattern?

Is there a map of the dead spots?  Any time-nuts live in/near one?

--
These are my opinions.  I hate spam.

> Since MSF *is* on 60 KHz, you do indeed get dead spots. If the two signals are not encoded identically, there should be an interesting signal when one of the transmitters is off and the other is on. Has anybody looked for that sort of pattern? Is there a map of the dead spots? Any time-nuts live in/near one? -- These are my opinions. I hate spam.
BK
Bob kb8tq
Tue, Feb 6, 2018 11:06 PM

Hi

If you look at the papers for the “new” WWVB format, there are plots of where the
MSF issues are likely to be the greatest. Since both signals are phase and amplitude
shifted by propagation effects, you will not get stationary nulls. You simply get zones
where the reception is tough.

Bob

On Feb 6, 2018, at 5:57 PM, Hal Murray hmurray@megapathdsl.net wrote:

Since MSF is on 60 KHz, you do indeed get dead spots.

If the two signals are not encoded identically, there should be an
interesting signal when one of the transmitters is off and the other is on.
Has anybody looked for that sort of pattern?

Is there a map of the dead spots?  Any time-nuts live in/near one?

--
These are my opinions.  I hate spam.


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Hi If you look at the papers for the “new” WWVB format, there are plots of where the MSF issues are likely to be the greatest. Since both signals are phase and amplitude shifted by propagation effects, you will not get stationary nulls. You simply get zones where the reception is tough. Bob > On Feb 6, 2018, at 5:57 PM, Hal Murray <hmurray@megapathdsl.net> wrote: > >> Since MSF *is* on 60 KHz, you do indeed get dead spots. > > If the two signals are not encoded identically, there should be an > interesting signal when one of the transmitters is off and the other is on. > Has anybody looked for that sort of pattern? > > Is there a map of the dead spots? Any time-nuts live in/near one? > > > > -- > These are my opinions. I hate spam. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.
PK
Poul-Henning Kamp
Tue, Feb 6, 2018 11:28 PM

Since MSF is on 60 KHz, you do indeed get dead spots.

If the two signals are not encoded identically, there should be an
interesting signal when one of the transmitters is off and the other is on.
Has anybody looked for that sort of pattern?

I have seen signs of that in my data in the shape of phase-shifts,
and that sort of made me concentrate on DCF & LORAN.

--
Poul-Henning Kamp      | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG        | TCP/IP since RFC 956
FreeBSD committer      | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.

-------- In message <20180206225742.6703040605C@ip-64-139-1-69.sjc.megapath.net>, Hal Murray writes: >> Since MSF *is* on 60 KHz, you do indeed get dead spots. > >If the two signals are not encoded identically, there should be an >interesting signal when one of the transmitters is off and the other is on. >Has anybody looked for that sort of pattern? I have seen signs of that in my data in the shape of phase-shifts, and that sort of made me concentrate on DCF & LORAN. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.