[ARC5] Very Cool SCR-274N Modulator

[jcoward5452 at aol.com]

I vaguely remember reading something long ago,maybe in the CQ Mobile 
handbook about re-wireing the commutator to modify dynamotors It seemed 
like a lot of work.My only electric motor winding experience were those 
kit motors that came in Lindburge Line  Navy ship models.
 Jay


-----Original Message-----
From: WA5CAB at cs.com
To: Jcoward5452 at aol.com; milsurplus at mailman.qth.net; 
arc5 at mailman.qth.net
Sent: Sun, Jul 19, 2009 8:30 am
Subject: Re: [ARC5] Very Cool SCR-274N Modulator



Jay,

You can actually make a 24 volt dynamotor run at approximately the 
original
design RPM off of 12 volts by relocating the grounded brush 90 instead 
of
180 degrees from the ungrounded one.  I did that with a DM-32 back in 
ancient
times.  But it's a kluge.  I'd have to guess that the one in the photo 
was
built for 12 volts.  Pulling the LV end bell would tell.  One 
possibility
would be a DY-10 with solid end bells.  But of course the relays in the 
BC-456
would have to have 12 volt coils as well.

Makes you wonder what they called the receivers and transmitters.  As 
there
are several of each, they couldn't just call them R-274 and T-274.

In a message dated 7/19/2009 10:17:56 AM Central Daylight Time,
jcoward5452 at aol.com writes:
> Is a dynamotor able to be convrted to12V from 24V or is this  orginal?
> Jay KE6PPF
>
>
> -----Original Message-----
> From: David Stinson <arc5 at ix.netcom.com>
> To: milsurplus at mailman.qth.net; ARC5 <arc5 at mailman.qth.net>
> Sent: Sat, Jul 18, 2009 6:57 pm
> Subject: [ARC5] Very Cool SCR-274N Modulator
>
>
>
> Check this out:
>
> http://tinyurl.com/ks2hpt
>
> Speculations??
>

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