[Milsurplus] DM28-R

[Michael Bittner]

Thanks for your effort, Meir.  73, Mike W6MAB


----- Original Message ----- 
From: "Meir WF2U" <wf2u at ws19ops.com>
To: <Milsurplus at mailman.qth.net>
Sent: Tuesday, March 23, 2010 6:41 PM
Subject: Re: [Milsurplus] DM28-R


> To all who wanted the copy of the Russian solid state replacement for the
> DM-28 dynamotor: I just need to extract the components list from my full
> Russian US-9 (the BC-348 clone) manual. The transformer is only specified 
> as
> a 27 V in/200 V out transformer, and the circuit is a standard 
> 2-transistor
> multivibrator circuit, with a 4 diode bridge rectifier on the secondary.
> I'll have it by the weekend, and I have the photos of the actual unit by
> itself and also mounted in the US-9 receiver. Incidentally, my US-9 
> receiver
> still has the original Russian dynamotor in it. The only difference 
> between
> the DM-28 and its Russian counterpart is that instead of the screw
> terminals, the base plate of the dynamotor has a 6 contact Jones type plug
> which mates with the connector on the receiver chassis. The solid state
> supply has the same footprint, and plug.
> I'll prepare the whole info packet as one PDF file.
>
> 73, Meir WF2U
> Landrum, SC
>
> -----Original Message-----
> From: milsurplus-bounces at mailman.qth.net
> [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Meir WF2U
> Sent: Saturday, March 20, 2010 1:55 PM
> To: 'John Hutchins'; Milsurplus at mailman.qth.net
> Subject: Re: [Milsurplus] DM28-R
>
> Try to get the solid-state dynamotor replacement made in the former Soviet
> Union, for the later models of the US-9 receiver (the Russian BC-348 
> clone).
> I can send you the schematic of that supply, it's a direct plug and play
> substitute for the dynamotor.
>
> 73, Meir WF2U
>
> -----Original Message-----
> From: milsurplus-bounces at mailman.qth.net
> [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of John Hutchins
> Sent: Friday, March 19, 2010 9:06 PM
> To: Milsurplus at mailman.qth.net
> Subject: [Milsurplus] DM28-R
>
> Group -
> I shoul have ask the question back in 1990 :-} but I did not own this
> unit at the time.
> I have a BC-348R where the previous owner had removed the  dynamotor
> body from the mounting plate.
>
> Any one design an build a 28V-120V Pulse Width  Regulated power supply?
>
>
> Hutch
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