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

[WA5CAB at cs.com]

Yes.  That, too.  Given that the meter the tech working on the thing would 
have had was probably an I-176.

In a message dated 7/19/2009 5:24:27 PM Central Daylight Time, 
Jcoward5452 at aol.com writes: 
> 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
> 

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