Hi …. and *much* better specified performance than the Racal parts.
Bob On Aug 25, 2011, at 5:13 PM, Rob Kimberley wrote: > 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: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] 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 <li...@rtty.us> wrote: > > From: Bob Camp <li...@rtty.us> > Subject: Re: [time-nuts] Racal 9420 OCXO > To: "'Discussion of precise time and frequency measurement'" > <time-nuts@febo.com> > 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: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] 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 > <robert8...@yahoo.co.uk>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, gandal...@aol.com <gandal...@aol.com> wrote: >> >> From: gandal...@aol.com <gandal...@aol.com> >> Subject: Re: [time-nuts] Racal 9420 OCXO >> To: time-nuts@febo.com >> Date: Wednesday, 24 August, 2011, 16:03 >> >> In a message dated 24/08/2011 00:03:19 GMT Daylight Time, >> dan...@verizon.net 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 -- 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. > > > > > > _______________________________________________ > 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.