[Milsurplus] [Fwd: [MRCA] ART-13 Power Supply Transformers]

[WA5CAB at cs.com]

The original post said capacitor input filter.

It would be a very bad idea to put the 28 volt winding on the HV 
transformer.  If you do, you will have to add a relay or relays capable of switching 
the 400 and 1100 volt lines.  Remember that neither the dynamotor not the 
transmitter has any such capability.  And that the dynamotor does not run all 
of the time.  It is shut down in Voice and if in CW, when tuning to a new 
channel. 

Plus if, as a number of people I know have, you have both the dynamotor and 
the AC supplies, why build two 28 VDC supplies.

In a message dated 4/28/2010 8:30:24 PM Central Daylight Time, 
quixote2 at ix.netcom.com writes: 
> At 18:24 28-04-10, J. Forster wrote:
> 
> 
> >Ladies and Gents and To Whom It May Concern:
> >
> >I have been working with the new Peter Dahl Co. regarding development of
> >a special power transformer specifically for the ART-13/ATC
> >transmitter.  The design is a single transformer, CCS ratings, that will
> >provide both the requisite 1100v and 400v B+ voltages via FW/CT windings
> >and is designed for capacitor input filter.  The CCS (not ICAS) rating
> >of the _each_ winding will be 300ma. DC.  Primary voltage will be
> >117/230v AC 60 Hz.  The quoted cost for 1-4 units is $225.  The weight
> >of each is said to be about 18 lbs.  Not a light-weight, at all!  I
> >priced out the rough equivalents in two Hammond transformers and came up
> >with about $180-$200 for the two required units.  The voltages, however,
> >are not tailored to the ART-13.
> 
> Is this transformer's design predicated on choke input or capacitor input
> filters?
> 
> If choke input, does Dahl produce suitable filter chokes to go with it?
> 
> 
> 
> >Also, be advised that the transmitter will still require 28v DC at about
> >8 amps for relays, filaments, and the autotune.  I did not approach that
> >issue with this transformer, however.
> 
> Ah...  therein lies the rub.
> 
> Why not add a 28 volt @ roughly 8 amp winding to this beast so that it can
> ALL come from one transformer?
> 
> 
> 
> Mr. T.  W9LBB
> 

Robert & Susan Downs - Houston
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