[time-nuts] Racal-Dana 1992 Startup -- GPIB!

[John Howell]

Thanks Alan, just what I wanted!
J.

On 16 Nov 2011, at 22:58, Alan Melia wrote:

> Hi John the attached is out of a 1987 catalogue.
> Alan
> G3NYK
> 
> ----- Original Message ----- 
> From: "John Howell" <j at howell61.f9.co.uk>
> To: "Discussion of precise time and frequency measurement"
> <time-nuts at febo.com>
> Sent: Wednesday, November 16, 2011 9:49 PM
> Subject: Re: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
> 
> 
>> Robert,
>> Do you have any information as to where a 9421 stands in this regime,
> specs etc? It is the same size as the 9420 and has a doubler board attached,
> but I don't know what equipment it was used in.
>> Regards,
>> 
>> John H.
>> 
>> 
>> 
>> On 16 Nov 2011, at 19:56, Robert Atkinson wrote:
>> 
>>> These counters used Racal's own 94xx series OCXO's. The 04A normally had
> a 9442, the 04E had the 9420. Easy way to tell which is which is the size.
> They are both 51mm (2") square with the 9442 being 51mm tall and the 9420 is
> 96mm (3.75") tall. The 9442 is also classed as fast warm-up, 6 minutes to
> 3x10^7.
>>> 
>>> These OCXO's were also used in Racal's frequency standards such as the
> 9478. They are very good OCXO's. All of them are 5MHz. Unfortunatly Racal
> considered them propriatry and never released any circuits or service
> information.
>>> All my information comes from Racal manuals and the 1984/85 catalogue.
>>> 
>>> Robert G8RPI.
>>> 
>>> 
>>> 
>>> ________________________________
>>> From: Larry McDavid <lmcdavid at lmceng.com>
>>> To: Robert Atkinson <robert8rpi at yahoo.co.uk>; Discussion of precise time
> and frequency measurement <time-nuts at febo.com>
>>> Sent: Wednesday, 16 November 2011, 18:25
>>> Subject: Re: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
>>> 
>>> There are other Racal timebase options as well.
>>> 
>>> I have a Racal 1999 counter that originally had a 04C timebase option
> that was not ovened and had a single adjustment screw. I replaced it with a
> 04A ovened ocxo that has a single adjustment screw. I will shortly install a
> 04E ocxo as Robert describes below. There is also a 04B ocxo option with two
> adjustment screws (coarse and fine). All the specs are slightly different.
> My manuals do not show a 04T option.
>>> 
>>> There is also a Rb oscillator option, 04R. I've never seen one of these.
>>> 
>>> None of these is necessarily on frequency! You must have something like
> a GPSDO that outputs 10 MHz to set any of the timebase options accurately.
> Accuracy is relative, of course!
>>> 
>>> I use a HP Z3801A GPSDO and a TAPR distribution amplifier to distribute
> the GPS-steered 10 MHz to numerous devices that accept an external timebase,
> such as the Racal counter.
>>> 
>>> It's a very nice counter.
>>> 
>>> Larry W6FUB
>>> 
>>> 
>>> On 11/16/2011 10:02 AM, Robert Atkinson wrote:
>>>> Hi Chuck,
>>>> You need to look at the option sticker on the back of the unit. The 04*
> is the oscillator option.
>>>> 
>>>> 04T is a TCXO 3x10^7 per month&  temp1x10^6 0-40 deg C
>>>> 
>>>> 04A Ovened oscillator 3x10^9 per Day&  temp3x10^9 0-45 deg
>>>> 
>>>> 04E High stability ovened oscillator 5x10^10 per day&  temp7x10^9 0-50
> deg C
>>>> No 04* is basic crystal oscillator. If yours has a mechanical and
> electrical trim it will be a 04A or 04E.
>>> ...
>>>> 
>>>> ________________________________
>>>> From: Chuck Forsberg WA7KGX N2469R<caf at omen.com>
>>>> To: time-nuts<time-nuts at febo.com>
>>>> Sent: Wednesday, 16 November 2011, 16:47
>>>> Subject: [time-nuts] Racal-Dana 1992 Startup -- GPIB!
>>>> 
>>>> I found a use for the GPIB interface on my counter - record
>>>> the frequency drift of its internal timebase during warm up.
>>>> It looks like an oven warming up.  I don't know exactly which
>>>> timebase my 1992 has, but I did notice the 5 to 10 MHz doubler
>>>> on the back of the oscillator,  The back has separate coarse
>>>> and fine frequency adjustments.  Can someone identify which
>>>> timebase is fitted to this counter?
>>>> 
>>>> The link below has the story and plot.
>>>> 
>>>> http://www.omen.com/ham/racal.html
>>> ...
>>> -- Best wishes,
>>> 
>>> Larry McDavid W6FUB
>>> Anaheim, CA  (20 miles southeast of Los Angeles, near Disneyland)
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>> 
>> 
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