[time-nuts] Racal 9420 OCXO

[Chuck Harris]

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: max at maxsmusicplace.com
>
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> ----- Original Message ----- From: "Bob Camp" <lists at rtty.us>
> To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
> 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-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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