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: m...@maxsmusicplace.com
Transistor site http://www.funwithtransistors.net
Vacuum tube site: http://www.funwithtubes.net
Woodworking site
http://www.angelfire.com/electronic/funwithtubes/Woodworking/wwindex.html
Music site: http://www.maxsmusicplace.com
To subscribe to the fun with transistors group send an email to.
funwithtransistors-subscr...@yahoogroups.com
To subscribe to the fun with tubes group send an email to,
funwithtubes-subscr...@yahoogroups.com
To subscribe to the fun with wood group send a blank email to
funwithwood-subscr...@yahoogroups.com
----- Original Message -----
From: "Tim Shoppa" <tsho...@gmail.com>
To: "Discussion of precise time and frequency measurement"
<time-nuts@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
<p...@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...@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 <
p...@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@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@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@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@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@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
