[time-nuts] Austron 1120 octal based oscillator
kb8tq at n1k.org
Wed Jul 30 18:27:28 EDT 2014
Ok, so if it’s an 8 pin base you have:
1) unknown, 4.6 K to ground
4) unknown, cap?
6) unknown, cap?
8) unknown ,cap?
Next thing to check is pin 1 to 4,6,8. After that 4 to 6 and 8, finally 6 to 8.
You *may* have a unit with a floating / isolated oven supply (say pins 6 and 8) and a grounded oscillator supply (say in on pin 4). The unit is certainly old enough to be from the split supply era.
On Jul 30, 2014, at 11:35 AM, GandalfG8 at aol.com wrote:
> I've recently acqured an octal based 4.096Mhz Austron 1120 oscillator that
> physically at least is a close match to the unit shown in the data sheet
> on Didier's site.
> However, this one, model 1120-1FWT dated 1981, which was indicated as
> being ex aircraft, looks to have significant connection differences.
> Pins 2, 3, 5 and 7, for example, are all grounded to the case, whereas the
> data sheet shows pins 2 and 3 as being respectively a 4V positive output
> and the positive supply input.
> Pin 1 has a consistent resistance of 4.6Kohm to ground and the other pins
> all have resistances to ground of several megohms that show variation if
> the meter polarity is reversed, suggesting the possibility of capacitors
> across these.
> From what little I've seen of other Austron oscillators they do seem to
> have been quite consistent with their use of pin 3 as supply positive, which
> might not be good news, but I'll assume for now that all is as it should be.
> However, before I risk a bit of trial and error, has anybody else come
> across this or a similar variant or have any additional 1120 data that might be
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