[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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