[Milsurplus] MRCG

[W7QHO at aol.com]

In a message dated 5/10/05 8:13:02 AM, kk5f at earthlink.net writes (concerning 
tthe PE-101C):


> That is the dynamotor for the BC-645 (SCR-515) IFF set.  I don't think it
> ever had much appeal.
> 

The PE-101 dynamotors were a popular surplus item back in the 50s when 
American cars started being produced with 12 volt electrical systems.   There are 
two motor windings on the armature and these are run in parallel for 12 volts 
input.     The stated current rating on the 700 volt output is only 20ma, but 
hams soon discovered that many times this value could be drawn from BOTH outputs 
with no problems. And, in doing so the output voltages dropped to something 
around 350 and 600 volts, just right for many mobile rigs of the period.   
Also, the 101's were smaller and much cheaper than the PE-103's a lot of guys used 
at the time which could be operated on 6 or 12 volts.

The typical conversion was to first remove the coding stuff and then trim the 
long end bell to take up the (now) empty space on that end of the unit.   The 
right angle connector was also usually removed and a box of some kind mounted 
on the top of the unit to house control relays and filtering components.   
The brushes for the 9 volt AC were also removed to reduce drag.   Some guys even 
removed the fan to get a little more output.

Dennis D. W7QHO
Glendale, CA