[Milsurplus] Re: [The WS No.19 Group] TCS Mains psu question

[WA5CAB at cs.com]

Ben,

I hope that this gets through.  Everything I posted yesterday bounced.

The TCS-13, -14 and one order of TCS-12 were supplied for use in small craft 
and vehicles and only shipped with one of the dynamotor supplies.  So that's 
all that the manuals cover.  I have manuals on 10 of the 15 number models, 
missing -1, 2, 3, 5, & -8.  The early models were only supplied with the 20218 
115VAC supply but it contains an S301 otherwise the same as S501 in the 20242.  
The TCS and TCS-4 manuals show the switch connected to terminals 1 and 2 on the 
transmitter HV transformer.  The text says that S301 (501) selects between 
400 and 450 VDC for the transmitter but nowhere in the installation or operation 
sections does it say when or why you might select either.  The TCS-6 manual 
still shows the switch wired to 1 and 2 but it is not mentioned in the text.  
The TCS-7,9,10,11,12 manual shows the switches connected only to terminal 1 
(that's the schematic that you have).  So sometime during production it was 
decided to eliminate the 450 VDC choice but possibly so that they wouldn't have to 
change the nomenclature of the supplies they left the switch in place.  

In any case, it does not appear that you would hurt anything if you moved the 
450 end of the switch to terminal 2.  On my TCS-14 I normally run the 
PP-380/U.  Years back I bridged the transmitter filter capacitors with additional 
capacitors that boosted the high B+ to about 450 and the transmitter still seems 
to have adequate drive to load to 200 ma.

In a message dated 2/27/2008 7:53:56 AM Central Standard Time, 
wf2u at ws19ops.com writes: 
> Quoting Military1944 at aol.com:
> 
> >TCS Mains power unit 20242
> >
> >On my psu, and on the circuit, and on the layout diagram there is switch
> >S501.
> >
> >On my psu it is marked 400-450v.  But, the actual wiring and that  shown on
> >the layout diagram, has both sides of the switch routed to pin 1 of   
> >  T502 (the
> >main tx ht transformer).
> >
> >Now, I guess that one side of the switch (400) should indeed go to pin 1,  
> ie
> >the full winding of the primary, and that the 450 side should switch the
> >mains to the next tap hence increase the o/p of the secondary, ie pin 2.
> >
> >BUT, this is a guess, so, before I blow up my psu, what do others think ?
> >
> >I can find no mention in the 13 and 14 handbooks downloaded off the
> >Royalsigs site.
> >
> >Does anyone have an actual manual for this psu ?
> >
> >cheers, Ben G4BXD.
> 

Robert & Susan Downs - Houston
<http://www.wa5cab.com> (Web Store)
MVPA 9480
<wa5cab at cs.com> (Primary email)
<wa5cab at comcast.net> (Backup email)
   
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.qth.net/pipermail/milsurplus/attachments/20080227/2d42d143/attachment.htm