[time-nuts] Datum TS-2100 Rubidium

[Greg Dowd]

Hey Rob!
	Yeah, there was a LPRO Rb option on that board and you are
remembering correctly.  The main thing was a dc-dc converter to get the
right voltage (24vdc?).  Then, I believe we just selected the external
clock and cranked the filter constant up to 1000 and I think that's it.
I can't quite remember how it was hooked up, I think maybe a couple SMB
mounts inside, one for clock and one for control voltage.  Let me know
if you want more info.

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Rob Kimberley
Sent: Tuesday, June 29, 2010 6:53 AM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Datum TS-2100 Rubidium

I seem to remember that we did a field upgrade on a TS2100 to add an
LPRO
when I was selling Datum stuff in the UK in the mid/late 90's. It did
bolt
on the chassis, with a small  PSU mod board, and I believe a firmware
upgrade included. 

Unfortunately I don't have any info on file any more. 

If Greg Dowd at Symmetricom is lurking on this site, maybe he could
point
you in the right direction.

Rob Kimberley

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Julien Goodwin
Sent: 29 June 2010 12:27 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Datum TS-2100 Rubidium

On 28/06/10 21:36, Julien Goodwin wrote:
> Up next is to convert the darn thing to Rubidium, like it was meant to

> be when I purchased it (insert rant here).

OK so the pinout vaguely matches, the TS-2100 is *very* twitchy on the
alarm
circuits, even a 1Mohm scope (well, it's 1M in theory, cheap
Rigol[1]) tripped it to reboot a few times.

But where in the world are you supposed to *put* the darn LPRO
oscillator,
it's too tall to fit above the board, and there doesn't look to be
enough
room between the back of the front panel and the main board.

I'm also not sure about the power supply thing, seeing only the single
post
to time-nuts about it.

I'd love photos, but I'd assume that most people that have one it sits
in a
rack running.

Thanks,
Julien

1: Actually 'tis one of the 50Mhz units "hacked" to 100Mhz operation, a
very
nice Tek 11k analog scope was reserved, but the seller appears to not
want
my business going silent after several prods.

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