[time-nuts] Bulova crystal oscillator

Bob kb8tq kb8tq at n1k.org
Thu Sep 7 11:30:14 EDT 2017


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. 


> 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
> -- 
> -----------------------------------------------------------------------
> 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
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