[time-nuts] Bulova crystal oscillator

[Magnus Danielson]

Hi,

I saw something very similar, and it had a bi-metal regulator.
Simple and effective for its time, but not very good if you care about 
better performance, as bang-bang regulation of slow rate isn't as good 
as the same crystal could do with a more linear regulation. Never the 
less, it's kind of nice.

Now, I wonder where that oven went, I'd love to get it running. :)
You always learn something. :)

Cheers,
Magnus

On 09/07/2017 05:30 PM, Bob kb8tq wrote:
> Hi
> 
> The 115VAC power suggests that it dates back a ways. The 100KC frequency suggests
> the same thing. It could easily be a 100 KHz crystal in a simple thermostat controlled oven.
> In that case, the stability would not be anything super duper.
> 
> Your guess of 0.001 Hz gives a 1x10^-8 sort of number. That’s probably a good guess for the
> set tolerance on the unit. Anything from there up to 1x10^-7 isn’t a bad guess for temperature
> stability. Again, it’s all guesswork.
> 
> Bob
> 
>> On Sep 6, 2017, at 10:26 PM, Glenn Little WB4UIV <glennmaillist at bellsouth.net> wrote:
>>
>> I have a Bulova crystal oscillator, part number 1505869-1K, model number AMO31HP-V-1, NSN 6N5840-797-7659.
>> The NSN tells me it is a little old and that it was a turn-in, probably repairable at some higher level.
>> The frequency is marked 100.000000 KHz.
>> The oscillator voltage is 30 V DC and the oven voltage is 115 VAC.
>> It has an octal plug on the bottom with the pins marked:
>> 1 - oven indicator
>> 2 - A.F.C.
>> 3 - heater power
>> 4 - +30 VDC
>> 5 - case ground
>> 6 - ground
>> 7 - heater return
>> 8 - 100 KC output.
>>
>> With the nameplate listing the frequency in KHz and the case listing the frequency in Kc and the older NSN, it appears that this oscillator was made for a longer period of time.
>>
>> The top has two adjustments, both with a screw cover.
>> One is freq adj and the other is output adj.
>>
>> Does anyone have any data on this oscillator?
>> What would I expect the accuracy to be?
>> The printed frequency implies, to me, that the accuracy is in the realm of 0.001 Hertz at 100 KHz.
>> Did I miss something here?
>> The top also shows this to be a "Generator Reference Signal".
>>
>> Any insite appreciated.
>>
>> 73
>> Glenn
>> WB4UIV
>>
>> -- 
>> -----------------------------------------------------------------------
>> Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
>> Amateur Callsign:  WB4UIV            wb4uiv at arrl.net    AMSAT LM 2178
>> QTH:  Goose Creek, SC USA (EM92xx)  USSVI LM   NRA LM   SBE ARRL TAPR
>> "It is not the class of license that the Amateur holds but the class
>> of the Amateur that holds the license"
>> ---------------------------------------------------------------------------
>>
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