Hi ….
There was a suitcase Rb that was used to sync up Have Quick's on the ground. It was a Magnavox product rather than Collins. The idea was to get the radios netted up without *anything* going over the air. Since the radios used TCXO's, sync was fairly loose. I suspect that tightened up as they went through the various versions ... Bob On Jul 28, 2013, at 6:58 PM, Brooke Clarke <[email protected]> wrote: > Hi: > > The military UHF voice radio scrambling depends on accurate time, hence the > Have Quick (and follow on programs) time transfer standard. > Rb standards were used to maintain that time in the early days. > > The O-1814 Rb standard was used to keep time on the ground accurate so that > when a plane flew in from far away the crypto would be in sync. > http://www.prc68.com/I/O1814.shtml > > PS has anyone done any PIC Have Quick stuff? > > Have Fun, > > Brooke Clarke > http://www.PRC68.com > http://www.end2partygovernment.com/2012Issues.html > > Brooke Clarke wrote: >> 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 <[email protected]> >>> To: Discussion of precise time and frequency measurement >>> <[email protected]> >>> 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 >>> <[email protected]>wrote: >>> >>>> maybe I should read things more often .. yikes I need a vacation >>>> >>>> >>>> On Sun, Jul 28, 2013 at 7:01 AM, George Dubovsky <[email protected]> >>>> 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 < >>>> [email protected] >>>>>> 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 -- [email protected] >>>>>> To unsubscribe, go to >>>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>>>> and follow the instructions there. >>>>>> >>>>> _______________________________________________ >>>>> time-nuts mailing list -- [email protected] >>>>> To unsubscribe, go to >>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>>> and follow the instructions there. >>>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- [email protected] >>>> To unsubscribe, go to >>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>> and follow the instructions there. >>>> >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >>> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
