[Milsurplus] TCK power supply...

[WA5CAB at cs.com]

They were most likely not intended for use with a bridge rectifier.  If the 
center tap insulator is smaller than the two end ones, that would be 
confirmation.  If it is the same as the other two, that still wouldn't mean that 
it was, given the 1800 VDC warning.  

Is the secondary 2500 CT (1250-0-1250) or 5000 CT (2500-0-2500)?  

Also, if the rated primary voltage is 115 VAC each winding, 103 VAC on each 
primary would drop the 2500 to 2239, not 1600.  If the primaries are 120, 
then 2146.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 04/15/2017 11:36:23 AM Central Daylight Time, 
kgordon2006 at frontier.com writes: 
> I have two very nice transformers here which were removed from some 
> Motorola high-band 
> transmitter or amplifier.
> 
> They are potted, very heavy, square jobs with ceramic posts to connect to. 
> They have dual 
> 115 VAC primaries, and a center-tapped secondary rated at 2500 VAC at 450 
> mA. 
> continuous duty. According to the data printed on the transformers, their 
> insulation has been 
> tested to 4KV, but there is also a warning printed on them stating that 
> their outputs should 
> not be run at more than 1800 VDC to ground. 
> 
> I find this last "interesting" and can't quite figure out why this is 
> there.
> 
> So, after doing some thinking about this last night, I thought that if I 
> used a full-wave bridge 
> rectifier on their outputs, I could reduce the primary voltage to 103 VAC 
> (bucking 
> transformer or Variac), which would limit the AC output to around 1600 
> VAC, which through 
> the FWB, would supply up to 2250 VDC output from the diodes, which, if I 
> am correct, puts 
> the DC voltage at 450 VDC above the rated voltage to ground.
> 
> I think....
> 
> Anyone?
> 
> Ken W7EKB
> 
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