Thank you.
I really do not want to buy from eBay. So far, none showed up with zero
problems. There's always something. My intent is to lock it to house
standard which is a GPSDO. I have lots of 10811 here but I don't know when
they were made. All I know is they are all 10811-6011. You are right -
especially for an instrument like this, standard is extremely important.
---------------------------------------
(Mr.) Taka Kamiya
KB4EMF / ex JF2DKG
On Saturday, July 20, 2019, 11:02:19 AM EDT, Bob kb8tq <[email protected]>
wrote:
Hi
If you are buying them on eBay, it is not at all clear which OCXO your A or B
will show up
with. The 10811’s get swapped back and forth with earlier units in a lot of
used gear. One
might *think* it’s a one way exchange, but I’ve seen it go both ways.
If you lock the counter to an external standard, it really does not matter a
lot which OCXO
is in it.
Bob
> On Jul 20, 2019, at 4:21 AM, Frank Stellmach <[email protected]>
> wrote:
>
> Hi Mr. Taka Kamiya,
>
> the B version has a 500MHz front end, copied from the HP5345A, with a matched
> pair of amplifier / Schmitt trigger hybrids.
> The A version has separate amplifier and Schmitt trigger ICs.
>
> There were also changes on the trigger circuit.
>
> Then the B version has a simplified µP board, has the OCXO (10811-60111),
> which is a must for absolute T.I. and frequency measurements.
>
> Maybe the firmware was also improved a bit, I think mainly concerning the
> GPIB steering of the trigger circuit.
>
> This T.I. counter is supposed to be superior over others of that era, because
> this special time interpolator was more linear.
>
> I really love mine, so I don't want to sell it.
>
> Frank
>
>
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