Hi Peter,
see the attached list of the so-called slash sheets of MIL-PRF-3098.
There are several items for crystals in HC-6/U holder. Most of the usually
define the stability over temperature as a rectangle, i.e. +-x % over a
certain temperature range. From that you can calculate, which range of
Can anyone point me to a specification document for CR-31/U and CR-23/U
crystals in HC-6/U packages, please.
I suspect their turnover temperatures may be defined by the spec, but I
cannot find anything online that refers to these particular types.
Thanks in Advance, and a Happy and Peaceful
Hi Walter,
On 2021-04-02 15:24, Walter Shawlee 2 wrote:
> I recently got 3 of these excellent counters, all ex-NASA in excellent
> physical condition.
> They all have the PM9696 OCXO option installed, but they also all have
> the same odd problem:
>
> Measuring my very stable GPSDO (which is
The oscillator circuit consists of an SSM2210 supermatch npn pair configured as
a long-tailed differential pair with a 12mA tail current and 51 ohm collector
loads. One output feeds the output buffer whilst the other provides feedback to
the crystal via an LC network that is series resonant at
I recently got 3 of these excellent counters, all ex-NASA in excellent
physical condition.
They all have the PM9696 OCXO option installed, but they also all have
the same odd problem:
Measuring my very stable GPSDO (which is monitored with another PM6654C),
the new ones constantly bounce
Hi
Unfortunately, even the numbers he quotes are going to be less than
ideal if multiplied directly to 10 GHz. Will they be “good enough” for
this or that? As always … that depends. It is rare to find any piece
of commercial gear that does it that way.
Bob
> On Apr 2, 2021, at 4:38 AM, John
Since low phase noise seems to be a main requirement here, this paper by Jeremy
Everard from York University may be of interest -
'Ultralow Phase Noise 10-MHz Crystal Oscillators'
Available here -
https://ieeexplore.ieee.org/document/8540461
It also shows construction of a double oven system
