[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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