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, [email protected] 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 > > > > > > > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
