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: [email protected] [mailto:[email protected]] 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 <[email protected]> wrote:
From: Bob Camp <[email protected]>
Subject: Re: [time-nuts] Racal 9420 OCXO
To: "'Discussion of precise time and frequency measurement'"
<[email protected]>
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: [email protected] [mailto:[email protected]] 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
<[email protected]>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, [email protected] <[email protected]> wrote:
From: [email protected] <[email protected]>
Subject: Re: [time-nuts] Racal 9420 OCXO
To: [email protected]
Date: Wednesday, 24 August, 2011, 16:03
In a message dated 24/08/2011 00:03:19 GMT Daylight Time,
[email protected] 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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