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.