[ARC5] Dynamotors.

[Mike Everette via ARC5]

The first thing I thought of when reading this post, was the DM-35 dynamotor from the BC-604/684 tank transmitter.  I doubt the Navy used them but the USMC may have.  (And what does "MARINES" stand for?  "My Ass Rides In Navy Equipment, Sir!")

The actual dynamotor for the DM-35 is about the same physical size as the DM-33 or DY-8/ARC-5.  The base is quite different, though.

Do the dynamotor bases have large Jones type connectors on them?  If so they may be DM-35s.  The connectors were used for input and output, of course, plus the jumpers that configured the transmitters for 12 volt or 24 volt.  The 24 volt counterpart to the DM-35 is the DM-37.
As for those two 6 volt motors in series input and parallel output... imagine the current draw!  And, you'd probably have some interesting experiences with "inductive kicks" especially on start-up.
73
MikeWA4DLF

      From: Kenneth G. Gordon <kgordon2006 at frontier.com>
 To: J Mcvey <ac2eu at yahoo.com> 
Cc: ARC-5 List <arc5 at mailman.qth.net> 
 Sent: Thursday, February 19, 2015 7:20 PM
 Subject: Re: [ARC5] Dynamotors.
   
On 19 Feb 2015 at 21:52, J Mcvey wrote:

> 
> "I also have two "new" 12VDC input, 600 VDC at 200 mA output dynamotors 
> I'll use for the transmitters."
> 
> Could you share the model number of this dynamotor? What system is is it 
> from?  My scr-274 series are converted to 12V, but the dynamotor that I have is
> only 440 volts, @ 200 ma. That's all I could find...

Sure. I have two: they are both Stromberg-Carlson Dynamotor 42486, 12V 
16.8 amps input, 680 VDC at 210 mA output, MPF-4-45. 

These were made by Webster Products

They have the US Navy anchor stamp on them. Neither one have the 
end-bells on them, so I am going to have to make some new ones for them 
before I use them. They have never been used.

These were part of a load of "junque" I got from our University's EE 
department when they were cleaning a bunch of that out.

They were obviously for some sort of military, U.S. Navy, transmitter, but I 
have no idea which one.

Maybe WA5CAB might know.

I did a search on eBay for dynamotors too, and found two 12V jobs which 
output 500 VDC at 200 mA.

I also found two 6V input jobs which output 600 VDC at 200 mA. I suppose 
you could connect the inputs in series and the outputs in parallel...

Ken W7EKB
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