More - found it !!!
3720788-501 CODE B is the RCA drawing number.
Is the circuit board on the RCA Series 1000, Base Station Power
Supply - apparent model number MI-559472, Instruction Book IB-8027297
The Technical Data block:
Equipment Designation
MI-599472 Power Supply Panel
AC Voltage
109, 121, 133 V AC
(tap adjustable)
121 V AC (nominal)
50/60 Hz
AC Input Current
0.5 Amperes (no load)
6 Amperes (full load)
Unregulated DC Output
13.0 V DC (full load) ... note current is not given ...
18.0 V DC (no load)
Regulated DC Output
13.8 V DC
+/- 2% regulation for +/- 10% line voltage variation
Current Overload Protection
Transformer Primary - 9 Amp Circuit Breaker
Regulated +13.8V - 5 Amp Fuse
.......
In the text, is the following ...
..... a high current transmitter power supply (+12.8 V @ 22A) .....
The manual and addendum are 10 pages long in case you are
interested ...
The MI-559472 Series 1000 Base Station Power Supply is used for
the following:
Use Freq band Tx Power *Manual number
Integral Local Control 50 MHz 100 Watts IB-8027307
Integral Local control 150 MHz 30/60 Watts IB-8027308
Remote Control 50 MHz 100 watts IB-8027310
Remote Control 150 MHz 30/60 watts IB-8027311
Repeater/Relay Control 50 MHz 100 Watts IB-8027312
Repeater/Relay Control 150 MHz 30/60 Watts IB-8027313
Radio Link Control 50 MHz 100 Watts IB-8027314
Radio Link Control 150 MHz 30/30 Watts IB-8027315
Plus others not listed here ...
*Refers to a note that says 'System Index' & 'This IB number
identifies this sheet only. When ordering or re-ordering books, use
each individual IB Number.'
The System Index lists all of the specific chassis used in the
station and the appropriate IB Number.
Hope this helps,
Neil - WA6KLA
Neil McKie wrote:
>
> Hello Paul,
>
> Your inclusion of the 3720788-501 number should help.
>
> I'll go look in a few minutes.
>
> Neil - WA5KLA
>
> Paul Kelley wrote:
> >
> > And here's a REAL long shot....
> >
> > I'm trying to find any info on this power supply, believed
> > to be from a RCA ~100 watt VHF base or repeater. The only
> > markings are: 3720788-501 CODE B.
> >
> > I don't have a picture so will try to describe it. Open
> > frame, rack mount, 7" height. One big transformer, two
> > chokes, 4 large filter caps and switch/circuit breaker on
> > the "front"... large heatsink for the rectifier diodes,
> > smaller one for the regulator pass transistor(?), regulator
> > board etc. on the "back". Seems to have an adjustable
> > regulated ~13.8V output and a high current unregulated
> > (ferro-resonant) output for a PA... I'm guessing good for
> > at least 20 amps. Also perhaps a terminal for connection
> > of a battery?? (seems to hook back into the unregulated
> > output through a big diode).
> >
> > Anybody got the slightest clue about this beast? I'd like
> > to know the current ratings and possibly find a schematic.
> >
> > Paul, N1BUG
> >
>
>
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