Re: [time-nuts] Racal 9420 OCXO schematic?
On 2/5/2013 6:00 AM, Marco IK1ODO -2 wrote: The subject says it all: anyone has the schematic of the Racal 9420 OCXO? A friend has one that stopped oscillating, and want to give it a try. Marco, there is a man in Wales who offers these schematics for sale [1] and also repairs 9087 signal generators. He has never replied to several emails I sent him, so good luck! I have had several failures in the smaller 9442 OCXO, all of which, among other things had hardened and brittle very fine PVC wiring into the inner parts. It is worth looking at this first of all and replacing it with Teflon / PTFE wring, if necessary. I have the circuit for the 9442, but haven't yet had a need for doing the much more complicated 9420. Touch wood. Dan [1] for about what you would pay for the OCXO on ebay. ___ 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] Racal 9420 OCXO schematic?
The subject says it all: anyone has the schematic of the Racal 9420 OCXO? A friend has one that stopped oscillating, and want to give it a try. 73 - Marco IK1ODO ___ 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.
Re: [time-nuts] Racal 9420 OCXO
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: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] 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 wrote: From: Rob Kimberley Subject: Re: [time-nuts] Racal 9420 OCXO To: "'Discussion of precise time and frequency measurement'" 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: 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 wrote: From: Bob Camp Subject: Re: [time-nuts] Racal 9420 OCXO To: "'Discussion of precise time and frequency measurement'" 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 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 wrote: > > From: 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 a
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 wrote: From: Rob Kimberley Subject: Re: [time-nuts] Racal 9420 OCXO To: "'Discussion of precise time and frequency measurement'" 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: 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 wrote: From: Bob Camp Subject: Re: [time-nuts] Racal 9420 OCXO To: "'Discussion of precise time and frequency measurement'" 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 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 wrote: > > From: 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. _
Re: [time-nuts] Racal 9420 OCXO
Ray-Kal Max Robinson wrote: Forgive someone revealing his ignorance but what is the pronunciation of Racal? Regards. Max. K 4 O D S. Email: m...@maxsmusicplace.com Transistor site http://www.funwithtransistors.net Vacuum tube site: http://www.funwithtubes.net 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 - Original Message - From: "Bob Camp" To: "Discussion of precise time and frequency measurement" Sent: Thursday, August 25, 2011 4:37 PM Subject: Re: [time-nuts] Racal 9420 OCXO 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 wrote: From: Bob Camp Subject: Re: [time-nuts] Racal 9420 OCXO To: "'Discussion of precise time and frequency measurement'" 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 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 wrote: From: 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 uns
Re: [time-nuts] Racal 9420 OCXO
"Ray cal" Sent from Paragon RC6 Captivate Max Robinson wrote: >Forgive someone revealing his ignorance but what is the pronunciation of >Racal? > >Regards. > >Max. K 4 O D S. > >Email: m...@maxsmusicplace.com > >Transistor site http://www.funwithtransistors.net >Vacuum tube site: http://www.funwithtubes.net >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 > >- Original Message - >From: "Bob Camp" >To: "Discussion of precise time and frequency measurement" > >Sent: Thursday, August 25, 2011 4:37 PM >Subject: Re: [time-nuts] Racal 9420 OCXO > > >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 wrote: >> >> From: Bob Camp >> Subject: Re: [time-nuts] Racal 9420 OCXO >> To: "'Discussion of precise time and frequency measurement'" >> >> 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 >> 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 wrote: >>> >>> From: 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 t
Re: [time-nuts] Racal 9420 OCXO
Forgive someone revealing his ignorance but what is the pronunciation of Racal? Regards. Max. K 4 O D S. Email: m...@maxsmusicplace.com Transistor site http://www.funwithtransistors.net Vacuum tube site: http://www.funwithtubes.net 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 - Original Message - From: "Bob Camp" To: "Discussion of precise time and frequency measurement" Sent: Thursday, August 25, 2011 4:37 PM Subject: Re: [time-nuts] Racal 9420 OCXO 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 wrote: From: Bob Camp Subject: Re: [time-nuts] Racal 9420 OCXO To: "'Discussion of precise time and frequency measurement'" 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 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 wrote: From: 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 uns
Re: [time-nuts] Racal 9420 OCXO
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 wrote: > > From: Bob Camp > Subject: Re: [time-nuts] Racal 9420 OCXO > To: "'Discussion of precise time and frequency measurement'" > > 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 > 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 wrote: >> >> From: 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
Re: [time-nuts] Racal 9420 OCXO
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 wrote: From: Bob Camp Subject: Re: [time-nuts] Racal 9420 OCXO To: "'Discussion of precise time and frequency measurement'" 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 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 wrote: > > From: 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.
Re: [time-nuts] Racal 9420 OCXO
Hi If they made them all, then it's probably worth tracing out the circuit. If they actually came from a dozen different places, one circuit could be quite different from the next. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of gandal...@aol.com Sent: Thursday, August 25, 2011 12:08 PM To: time-nuts@febo.com Subject: Re: [time-nuts] Racal 9420 OCXO In a message dated 25/08/2011 17:00:24 GMT Daylight Time, li...@rtty.us writes: 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... -- Who knows what might or might not be contracted out at any given time?, but one at least of the internal PCBs has the Racal logo etched on the track side so I would think it reasonable to assume Racal design and manufacture. Regards Nigel GM8PZR ___ 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.
Re: [time-nuts] Racal 9420 OCXO
On 8/25/2011 9:23 AM, Robert Atkinson wrote: 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. I agree Robert. I have maybe a dozen or more Racal receivers here, all the UK ones had Racal made frequency standards. Most of the US built ones had bought in ovens, notably the 6790/GM. The 6772Es came with a nice looking US Racal badged on the outside TCXO all of which however seem now to be faulty, even the NOS spare one I had. Opening them up you find inside a nasty looking plastic OEM module they must have seriously regretted buying :^) Dan ___ 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.
Re: [time-nuts] Racal 9420 OCXO
Hi Bob I will enquire of a friend. I would not be surprised if they were in house manufacture they were used for a very long epriod without changes in "design". There is a history of UK firms making their own OCXOs .Pye, Marconi, etc. Racal had a big investment in frequency determination for most of their output went to the military. There are sophisicated standards and Rubidiums in their catalogue. Most of the OCXO (quartz crystal specialist) makers in the UK finished them is sealed cans. Racal were of course the parent of Vodaphone and made a lot of their original site hardware. Alan G3NYK - Original Message - From: "Bob Camp" To: "'Discussion of precise time and frequency measurement'" Sent: Thursday, August 25, 2011 5:01 PM Subject: Re: [time-nuts] Racal 9420 OCXO > 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 > 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 wrote: > > > > From: 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.
Re: [time-nuts] Racal 9420 OCXO
The blue labels just barely visible behind the control panel in the close-up pictures look an awful lot like actual Sulzer labels. I wonder if instead of being licensed it was actually OEM'd and they just replaced the front panel with a purpose-built one. John On 8/25/2011 12:23 PM, Robert Atkinson wrote: 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 wrote: From: Bob Camp Subject: Re: [time-nuts] Racal 9420 OCXO To: "'Discussion of precise time and frequency measurement'" 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 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 wrote: From: 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.
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 wrote: From: Bob Camp Subject: Re: [time-nuts] Racal 9420 OCXO To: "'Discussion of precise time and frequency measurement'" 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 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 wrote: > > From: 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.
Re: [time-nuts] Racal 9420 OCXO
On 8/25/2011 9:01 AM, Bob Camp wrote: 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... Having just been inside one Bob, I can say for sure, yes, they were made by Racal at I presume Bracknell, the sub assemblies all have racal style part numbers and use similar components to a lot of the instruments of that period. Also having just been in a 9420 I can totally see why they didn't want anyone mucking about inside it. I suspect like the -hp- 10811 there were some adjust on test values that depended on the individual crystals. But all that doesn't apply to us time nuts does it?I didn't consider myself a true "nut" until I'd been inside and fixed a dead 10811 with an open thermistor :^). In any case Racal as such is long gone and there's no one to return them to any more so we don't have a lot of choice. Dan ___ 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.
Re: [time-nuts] Racal 9420 OCXO
In a message dated 25/08/2011 17:00:24 GMT Daylight Time, li...@rtty.us writes: 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... -- Who knows what might or might not be contracted out at any given time?, but one at least of the internal PCBs has the Racal logo etched on the track side so I would think it reasonable to assume Racal design and manufacture. Regards Nigel GM8PZR ___ 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.
Re: [time-nuts] Racal 9420 OCXO
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 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 wrote: > > From: 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.
Re: [time-nuts] Racal 9420 OCXO
In a message dated 24/08/2011 21:06:33 GMT Daylight Time, robert8...@yahoo.co.uk writes: 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. - Hi Robert Thanks for that information, I've seen similar comments in other manuals re returning for repair but was hoping there might have been something in circulation. regards Nigel GM8PZR ___ 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.
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 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 wrote: > > From: 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.
Re: [time-nuts] Racal 9420 OCXO
On 8/24/2011 8:03 AM, gandal...@aol.com wrote: 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. Absolutely Nigel. If the thing is to be used on it's own with the top multi turn cap as the only adjustment then you link the 2.8 V output on pin 5 to pin 6, the EFC input. It looks like they were designed to suit a number of roles. I just pulled one out of the garage and it settled on 5. after 20 minutes, so perhaps I was a bit harsh on them. Good value really at the sort of price I have bought them for on eBay, less than $10 :^) In the days before GPS and cheap Rb the Racal OCXO in my 1992 counter was the best standard I had, apart from my 50 [?] year old Sulzer maybe. But I will still defer tracing out the circuit until I need to pull one apart :^) Dan ___ 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.
Re: [time-nuts] Racal 9420 OCXO
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.
Re: [time-nuts] Racal 9420 OCXO
In a message dated 24/08/2011 00:03:19 GMT Daylight Time, dan...@verizon.net writes: Nigel, I took the liberty of correcting the part number in the header. They are quite common, also quite often go wrong, so beware if you buy any off ebay... 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. So yes, in theory they could be used as a basis for a GPS disciplined standard, but a quick eBay search shows a lot of more modern and probably better quality 10 MHz OCXOs from China... Whoops:-) Hi Dan, and thanks for the correction, bit of a silly error considering I actually had one in front of me as I typed:-) I've never owned an RA1795 but don't recall the fine tune option being used in the RA1794 or 1796, despite that table I included, but it's been a while and I could be wrong. This 9420 has a base plate still attached and with pins 5 and 6 linked at the B7G socket, which does seem to imply the EFC option could be available even if not used in this particular instance. Thanks for the repair tips, I'll bear that in mind when I get time to check this one out. I certainly agree re the more modern 10MHz oscillators, and I don't have a particular need for another 5 MHz GPSDO anyway, but having been given this oscillator thought it might be fun to knock something up and see how it compared to the Rapco 1804M units I've been playing with. 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.
Re: [time-nuts] Racal 9420 OCXO
On 8/23/2011 1:09 PM, gandal...@aol.com wrote: Hi All, This is quite a common oscillator, with variants used in a number of Racal receivers or offered as high stability options for Racal counters etc, but although the specs are widely available I've not found anything from Racal that might be considered to be a user manual. Nigel, I took the liberty of correcting the part number in the header. They are quite common, also quite often go wrong, so beware if you buy any off ebay... 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. So yes, in theory they could be used as a basis for a GPS disciplined standard, but a quick eBay search shows a lot of more modern and probably better quality 10 MHz OCXOs from China... Dan ___ 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.
