[time-nuts] Austron 1120 octal based oscillator

Bob Camp kb8tq at n1k.org
Wed Jul 30 18:27:28 EDT 2014


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, 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 
> relevant?
> 
> Regards
> 
> Nigel
> GM8PZR
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
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