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<c...@omen.com>
To: time-nuts<time-nuts@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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