[Milsurplus] T-195 power supply

[W7QHO at aol.com]

In a message dated 6/29/05 7:32:50 AM, flood at Krohne.com writes:


> I have come into a large number of 24-28VDC 60 amp power supplies.  These
> are switching supplies pulled out of 250-500 Watt 900MHz paging
> transmitters.  My thoughts went to using these as a power supply for the
> T-195 transmitter I picked up this spring.  Have any of you out there used
> something similar.  I was worried about switching noise.  I have a very
> quiet switcher running the R392 now.
> 

On the noise question, turn one on next to a receiver, tune around and take a 
listen.

As to using your switcher to run a T-195, depends on whether or not your set 
has the solid state replacements for both internal dynamotors.   The 
electromechanical dynamotors, especially the 1000 volt unit, require a power supply 
capable of providing a high starting current surge (couple of hundred amps for a 
few milliseconds).   Switching power supplies generally aren't capable of 
providing this.   One solution here would be to "float" a couple of 12 volt car 
batteries in series across the output to take the surge.   

A number of T-195's I've seen have a solid state 1000 volt supply and a 
dynamotor to supply the lower voltages.   Your switcher alone might run this 
combination, but you would have to try and see.

Would be interested in one of your switchers.

Dennis D. W7QHO
Glendale, CA