[time-nuts] More pictures of the mystery Collins Ru

[Brooke Clarke]

Hi:

I think (3).  See:
http://en.wikipedia.org/wiki/TACAMO
http://en.wikipedia.org/wiki/Ground_Wave_Emergency_Network -> some converted to DGPS

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html

Robert Atkinson wrote:
> Hi Tim,
> Three possible reasons for needing a Rb standard,
> 1/ Coherent detection with a local clock
> 2/ Hyperbolic navigation (local reference improves the fix and holdover)
> 3/ Secure communications.
>
> Robert G8RPI
>
>
>
>
> ________________________________
>   From: Tim Shoppa <tshoppa at gmail.com>
> To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
> Sent: Sunday, 28 July 2013, 15:25
> Subject: Re: [time-nuts] More pictures of the mystery Collins Ru
>   
>
> Googling a little bit, I find several references to a Collins rubidium
> package AFS-81 for airborne survivable VLF communications in the 60's
> (predating this unit by maybe two decades). Still trying to wrap my head
> around why that would need rubidium unless it was an airborne WWVB
> replacement or something.
>
> Googling also turned up the modern Rockwell-Collins 617A-1 VLF amp which
> seems to be a dinky solid state unit that is rated at a third of a
> megawatt. Still having a hard time wrapping my mind around that! Maybe I'm
> off by 2 or 3 orders of magnitude or the picture is just the control head,
> the real amplifier is the size of a building. A third of a megawatt must be
> the size of the fixed transmitters used for VLF submarine communications.
>
> Tim N3QE
>
>
> On Sun, Jul 28, 2013 at 9:40 AM, Pete Lancashire <pete at petelancashire.com>wrote:
>
>> maybe I should read things more often .. yikes I need a vacation
>>
>>
>> On Sun, Jul 28, 2013 at 7:01 AM, George Dubovsky <n4ua.va at gmail.com>
>> wrote:
>>
>>> Well, the outside label does claim it was made by GENRAD... ;-)
>>>
>>> 73,
>>>
>>> geo - n4ua
>>>
>>>
>>> On Sat, Jul 27, 2013 at 9:24 PM, Pete Lancashire <
>> pete at petelancashire.com
>>>> wrote:
>>>>
>> https://plus.google.com/u/0/photos/111617808980322733757/albums/5890266601277045697
>>>> The board with the edge connector was inside the same bag the
>>>> connector was in, the bag was taped to the unit.
>>>>
>>>> I pulled the ends off first, but was immediately stopped with foam, it
>> is
>>>> glued in place.
>>>> Then when I finally got the lid with all the screws off, all there is,
>> is
>>>> one board covered in potting compound.
>>>>
>>>> The compound breaks away pretty easily. One can see where a couple
>> parts
>>>> were
>>>> replaced and there soft RTV was used. There are two precision resistors
>>> in
>>>> that area.
>>>>
>>>> The biggest surprise is the General Radio logo on the board !
>>>>
>>>> goo.gl/1XGG2F
>>>> _______________________________________________
>>>> time-nuts mailing list -- time-nuts at febo.com
>>>> To unsubscribe, go to
>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>>> and follow the instructions there.
>>>>
>>> _______________________________________________
>>> time-nuts mailing list -- time-nuts at febo.com
>>> To unsubscribe, go to
>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>> and follow the instructions there.
>>>
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
>