[time-nuts] VLF Phase-tracking receivers.

paul swed paulswedb at gmail.com
Tue Aug 12 22:06:51 EDT 2014


Never heard of a tracor 900 but sun of a gun its used for NAA.
Here is the ops and service manual with schematics! Mr Google is one scary
engine
Regards
Paul
WB8TSL


On Tue, Aug 12, 2014 at 10:01 PM, paul swed <paulswedb at gmail.com> wrote:

> 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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>
>
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