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

[Robert Atkinson]

Not true,
Many aircraft OMEGA / VLF navigation systems used Rb clocks. Most if not all the FRKs on the surplus market with the 10MHz output on the multipole connector rather than a SMA came from OMEGA / VLF units. I used to fix the systems.

Robert G8RPI.




________________________________
 From: Max Robinson <max at maxsmusicplace.com>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com> 
Sent: Sunday, 28 July 2013, 23:24
Subject: Re: [time-nuts] More pictures of the mystery Collins Ru
 

If they needed an airborne rubidium standard it must have been for digitally 
scrambled communications.  That has been around since the 60s.

Regards.

Max.  K 4 O DS.

Email: max at maxsmusicplace.com

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----- Original Message ----- 
From: "Tim Shoppa" <tshoppa at gmail.com>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Sunday, July 28, 2013 9:25 AM
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
>> > > _______________________________________________
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