[MRCA] solid state dynamotor

[wf2u at ws19ops.com]

I'm dealing with a somewhat similar situation where I need a  
substitute for the dynamotor (12 VDC in, 500 VDC @ 200 mA out) which I  
don't have and may never find, for an AT-1, a WW2 vintage Canadian  
Marconi built aircraft transmitter.
I bought a 150 W, 12 VDC to 115 VAC car inverter for $24, which is  
fairly small.
I'll get a 115 to HV transformer - probably out of my junkbox, rectify  
the output and it'll work fine.
If one side of the inverter's 115 VAC output can be grounded (the -12  
VDC is ground), I could just quadruple the 115VAC and get close to  
500VDC out, without using a transformer.
Since the transmit/receive relay in conjunction with the system  
receiver (AR-2, which has a good working dynamotor) turns on the  
transmitter dynamotor only on transmit, I'm not even concerned with  
RFI from the inverter, as it won't be on during receive periods.
There are also various DC to DC converters for vintage transceiver out  
there, like for the Drake line, the National and Hallicrafter  
transceivers. Heathkit also had DC-DC power supplies for transceivers  
to use in mobile setups.

73, Meir WF2U
Landrum, SC

Quoting Ray Fantini <rafantini at salisbury.edu>:

> Anyone have a DC to DC inverter or solid state dynamotor   
> replacement? Was thinking of building up a replacement power supply   
> deck for my ARR-41 I am going to remove the original dynamotor deck   
> and set it aside in case I want to use it but want to build a solid   
> state replacement deck that will fit into the original radio and   
> allow it to operate without the noise of the dynamotor deck. Do not   
> want to change any of the DC distribution wiring so would prefer to   
> use something like the solid state replacement dynamotors that were   
> used on some of the last produced ARC equipment, also if anyone has   
> a hacked ARR-41 power supply deck less dynamotor that will save a   
> lot of fabrication.
> Ray Fantini KA3EKH
>
>
> _______________________________________________
> MRCA mailing list
> MRCA at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/mrca
>