Hi
Ok, so if it’s an 8 pin base you have:
1) unknown, 4.6 K to ground
2) ground
3) ground
4) unknown, cap?
5) ground
6) unknown, cap?
7) ground
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.
Bob
On Jul 30, 2014, at 11:35 AM, gandal...@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
relevant?
Regards
Nigel
GM8PZR
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