[Milsurplus] SCR522/542 was Kluge conversion of 24 volt dynamotors to 12 ...

[jcoward5452 at aol.com]

Interesting that the voltages are specified to the 100th of a volt.
 Jay

-----Original Message-----
From: WA5CAB at cs.com
To: scr287 at sbcglobal.net
Cc: milsurplus at mailman.qth.net
Sent: Sun, Jul 19, 2009 3:18 pm
Subject: Re: [Milsurplus] SCR522/542 was Kluge conversion of 24 volt 
dynamotors to 12 ...



Actually, it's a little more complicated than that in the PE-94, 
although I
have no idea why.  I was in a hurry a while ago (my wife had just had 
about
65 items sell on eBay and we were supposed to be busy packing them)  
and
didn't include all of the details.  In the PE-98-(*) the carbon pile 
regulator
keeps the output of the LV generator winding at 13 volts.  In the 
PE-94-(*)
there is a resistor 317 between the generator winding and the regulator 
and
line going to the radio.  The regulator keeps the voltage downstream of 
the
resistor at 13 volts but the dynamotor LV output actually runs at 14.5
volts.  The resistor is not present in the PE-98.

The 12.35 to 13.52 volt range is what the book gives as worst case
regulator oscillatory range after turn-on or other large change in 
loads.

In a message dated 7/19/2009 4:55:25 PM Central Daylight Time,
scr287 at sbcglobal.net writes:
> To be absolutely correct, the book says the filament supply
> in the radio proper is 13 Volts.
>
> One reason for the apparent complexity of running the filaments
> from a dynamotor winding, is that both the 28V PE-94 and 14V
> PE-98 have a carbon pile regulator in them, that senses the 13V output
> and adjusts dynamotor speed accordingly.
>
> According to the book, the output variation is 12.35 to 13.52 Volts.
>
> Jack Antonio WA7DIA

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480
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