Hi Robert, An interesting bit of history there. FTS (Frequency & Time Systems) used to be owned by Oscilloquartz, but sold to Datum, to get their Caesium products into the US market, and then FTS licenced the Cs technology back. (I think I'm right on that one). Ball Efratom also bought by or merged with Datum. I used to work for Sematron Limited as Product Manager responsible for all Datum group products in the UK, and Sematron was set up by to ex-Racal guys John O'Brien & Kevin Hall.
Rob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Robert Atkinson Sent: 26 August 2011 12:49 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Racal 9420 OCXO Hi Rob, That's interesting. Racal Instruments were agents for Oscilloquartz and Ball Efratom. Their Rubidium standards have Efratom FRKs in them. Robert G8RPI. --- On Thu, 25/8/11, Rob Kimberley <[email protected]> wrote: From: Rob Kimberley <[email protected]> Subject: Re: [time-nuts] Racal 9420 OCXO To: "'Discussion of precise time and frequency measurement'" <[email protected]> Date: Thursday, 25 August, 2011, 22:13 I seem to remember Racal in the UK buying some Datum (FTS Division) 1000B units off me in the 90's. http://www.n4iqt.com/fts1000b/1000b-r2.pdf Nice oscillator. Rob Kimberley -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Robert Atkinson Sent: 25 August 2011 5:24 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Racal 9420 OCXO I'm pretty sure Racal made these. They are of consistent design over different models and many years and are unlike any other manufacturers OXCO I've seen. Racal were old school and did prettymuch everything themselves. The did do what appears to be a licence built Sulzer though. The MA-259, see http://www.radiomuseum.org/r/racal_precision_frequency_stan.html Regards, Robert G8RPI. --- On Thu, 25/8/11, Bob Camp <[email protected]> wrote: From: Bob Camp <[email protected]> Subject: Re: [time-nuts] Racal 9420 OCXO To: "'Discussion of precise time and frequency measurement'" <[email protected]> Date: Thursday, 25 August, 2011, 17:01 Hi Do we know for sure that Racal actually made these OCXO's in house? My *guess* is that they were made by various companies over the years and sold to Racal. The "return for service" would have been a return to Racal and then they forward it to the people who made it... Bob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of paul swed Sent: Wednesday, August 24, 2011 5:10 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Racal 9420 OCXO Kind of amazing what time-nuts have in there secret documentation. Though I do not need this thanks for sharing. Regards Paul WB8TSL On Wed, Aug 24, 2011 at 4:05 PM, Robert Atkinson <[email protected]>wrote: > Hi, > I've attached a copy of the catalogue specification for Racals OCXOs. > They do have electronic trim as standard. They are used in the 9478 > frequency standard. The 9478 service manual specfically states that no > information on > the OCXOs is provided and they must be returned to Racal or appointed agents > for repair. > > Robert G8RPI > > --- On Wed, 24/8/11, [email protected] <[email protected]> wrote: > > From: [email protected] <[email protected]> > Subject: Re: [time-nuts] Racal 9420 OCXO > To: [email protected] > Date: Wednesday, 24 August, 2011, 16:03 > > In a message dated 24/08/2011 00:03:19 GMT Daylight Time, > [email protected] writes: > > I don't think Racal released circuit diagrams of any of their ovens. > I have traced out the circuit of the rapid warm up oven found in a > lot of receivers, the 9442-12 and have fixed those, there is a ceramic > cap that frequently goes wonky. The two 9420s I have fixed were just > broken wires; they seem to have used PVC insulated wire which > degrades... I haven't done the homework on those yet. > > The 9420s I have do have an EFC input as well as a stabilised Voltage > out to feed it, and in the receivers I have that use it [RA1795] the > fine setting is done from that, coarse setting from the top adjustment. > ------------------------- > Hi Dan > > I've taken a further look at the RA1794 manual and see now that it > does confirm a fine tune pot being available when using the 9420. > Having opened up this oscillator I find there are connections to > every pin > on the B7G connector so will assume until proven otherwise that it > does meet the interface spec shown in the 1794 manual. > I suspect the comments I've seen claiming most do not have the EFC > option is more a case that in many installations it isn't used, which > isn't quite > the same thing. > > Thanks again for your comments. > > regards > > Nigel > > > _______________________________________________ > 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.
