[Milsurplus] BC-348 OSC temperature capacitors

John Hutchins jphutch60bj at gmail.com
Fri Feb 8 19:26:30 EST 2013


Group -

I don't know much about, temperature Compensating Capacitors, for the 
BC-348 receivers
    Were they carefully chosen for each production lot or unit as the 
case in the Collins Oscillator for the R105A/ARR-15. I will assume most 
likely not.
   1.  Listings in TM for ceramic capacitors did not document the 
temperature coefficients.
   2.  Listings in TM for mica Capacitors, postage stamp did not 
document the temperature characteristics, temperature ranges.
   Brings my questions 3, three:
   1. How they were chosen, any RCA articles on this?
   2. Were these capacitor temperature specifications set, specified, 
once for each BC-348 model production line, that was that?
   3. If I needed to replace one of these temperature Compensating 
Capacitors,  capacitors listed below, are these equivalent to NPO's of 
today?


TO2012R2-3BC-112_BC
Reference page 7-10 parts for temperature compensating capacitors for 
BC348R == ++
40++ Capacitor: Mica 500volts DC 4.1 mmfd +-.2mmfd with lugs  | Osc. 
Temperature Compensating| Mgf: UE |
41++ Capacitor: Mica 500volts DC 4.2 mmfd +-.2mmfd with lugs  | Osc. 
Temperature Compensating| Mgf: UE |
42     Capacitor: ceramic 500volts DC 20 mmfd +-5%  with leads | Osc. 
Temperature Compensating| Mgf: CRL |
43     Capacitor: ceramic 500volts DC 65 mmfd +-5%  with leads | Osc. 
Temperature Compensating| Mgf: CRL |
44     Capacitor: ceramic 500volts DC 90 mmfd +-3%  with leads | Osc. 
Temperature Compensating| Mgf: CRL |
45     Capacitor: ceramic 500volts DC 35 mmfd +-5%  with leads | Osc. 
Temperature Compensating| Mgf: CRL |
46     Capacitor: ceramic 500volts DC 40 mmfd +-5%  with leads | Osc. 
Temperature Compensating| Mgf: CRL |
-Thanks
Hutch


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