[time-nuts] Looking for a particular OCXO....

Brian, WA1ZMS wa1zms at att.net
Mon May 26 20:00:33 EDT 2014


Boy you are spot on about what "damage" sales guys can do.

The original OCXO spec is x10 better than the 16Hz I get with the DAC at the limit.

Thanks.

-Brian, WA1ZMS/4
iPhone

> On May 26, 2014, at 6:25 PM, Bob Camp <kb8tq at n1k.org> wrote:
> 
> Hi
> 
> 
>> On May 26, 2014, at 5:54 PM, Brian, WA1ZMS <wa1zms at att.net> wrote:
>> 
>> My high-spec ULN Wenzels have trimmers.
>> 
> 
> I doubt that HP has put a trimmer OCOX  into a new design since the 10811 was new. The Wentzel ULN’s are *not* high volume parts.
> 
>> This this thing is 16Hz high at 10MHz so it's way off.
> 
> 16 Hz is 1.6 ppm. That’s not really all that far. If the oven failed it would be much farther off
> 
>> Must be sudden failure. If I use an external ref the test set is fine. OK for lab use. But a pain when out working in the field on ham repeaters. It may be an OEM number.  At work we noticed quite a change in PTI product lines after MTron bought them.
> 
> Renumbering all the products is what keeps the marketing guys employed…
> 
>> 
>> -Brian, WA1ZMS/4
>> iPhone
>> 
>>> On May 26, 2014, at 5:15 PM, Bob Camp <kb8tq at n1k.org> wrote:
>>> 
>>> Hi
>>> 
>>>> On May 26, 2014, at 4:31 PM, Brian, WA1ZMS <wa1zms at att.net> wrote:
>>>> 
>>>> I am trying to repair my HP-8920 RF Com test set since its internal
>>>> 
>>>> 10MHz OCXO has aged way beyond the DAC EFC cal range.
>>> 
>>> How far out is it?
>>> 
>>>> (There
>>>> 
>>>> is no trimmer cap to allow adjustment.)
>>> 
>>> Trimmer caps went out a long time ago on OCXO's
>>>> 
>>>> 
>>>> 
>>>> The OCXO is 10MHz and is marked PTI XO1145.
>>> 
>>> It’s probably an OEM part number
>>>> 
>>>> PTI no longer lists nor seems to sell this OCXO.
>>> 
>>> They likely only sold that part to HP
>>> 
>>>> 
>>>> 
>>>> 
>>>> Has anyone seen or have a replacement OCXO or already been
>>>> 
>>>> done this path before?  I hate to re-invent the wheel.
>>>> 
>>>> I can buy a used A15 ref module but I still may end up with one
>>>> 
>>>> that has an OCXO that's out of cal range.
>>>> 
>>>> 
>>>> 
>>>> Reply off-list is fine.
> 
> which takes all the fun out of it 
> 
>>>> 
>>>> 
>>>> 
>>>> -Brian, WA1ZMS
>>>> 
>>>> 
>>>> 
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>>> 
>>> Bob
>>> 
>>> 
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> Bob
> 
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