[time-nuts] Racal 9420 OCXO

[Bob Camp]

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-bounces at febo.com [mailto:time-nuts-bounces at 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 <lists at rtty.us> wrote:
> 
> From: Bob Camp <lists at rtty.us>
> Subject: Re: [time-nuts] Racal 9420 OCXO
> To: "'Discussion of precise time and frequency measurement'"
> <time-nuts at 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-bounces at febo.com [mailto:time-nuts-bounces at 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
> <robert8rpi at 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, GandalfG8 at aol.com <GandalfG8 at aol.com> wrote:
>> 
>> From: GandalfG8 at aol.com <GandalfG8 at aol.com>
>> Subject: Re: [time-nuts] Racal 9420 OCXO
>> To: time-nuts at febo.com
>> Date: Wednesday, 24 August, 2011, 16:03
>> 
>> In a message dated 24/08/2011 00:03:19 GMT Daylight Time, 
>> danrae at 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
>> 
>> 
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