[time-nuts] VLF Phase-tracking receivers.

[paul swed]

OK now I am on a real keyboard. the ole iphones a bit small.
I was indeed aware that the subs use msk 20-50hz as I have measured in the
past.
But avoided the details on the small keyboard. I have also used several of
the military radios when I was in the Navy. Far to many years ago.
NAA thats maybe 100 miles a way can be easily detected with a diode and
tuned circuit.
All that said I have absolutely no real detail on the quality  and
stability of the signal. Subs do need a stable signal. But I know really
nothing.
I know Paul has suggested that just maybe the signal would be useful.
Regards
Paul WB8TSL


On Sun, Aug 10, 2014 at 10:30 PM, Kenneth G. Gordon <
kgordon2006 at frontier.com> wrote:

> On 10 Aug 2014 at 19:00, Jim Lux wrote:
>
> > It can also be FSK..
> > but it's essentially the narrowest band simple modulation that is
> > constant envelope.
>
> As I said, back in the 1970s, the Navy installed special equipment to
> enable
> phase-stable output.
>
> Dunno the exact details, but that was what I was told back then...by the
> Navy.
>
> Still dunno if my Tacor 599s will even "listen" to VLF stations now, but I
> intend to try them.
>
> VLF has always interested me...
>
> I have several operable VLF receivers: RAK, RBL, SRR-11, AN/URM-6,
> NM-40A, R-389, etc.
>
> RAK is interesting in that although a TRF, it still exhibits
> "single-signal" CW
> reception: the "other side" of zero-beat simply doesn't exist. I was
> amazed...
>
> Ken W7EKB
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