[MRCA] T-195 Power Supply Options

[B. Smith]

I use two power supplies in parallel with isolating diodes. I prefer to keep 
large batteries in a open space and preferably outside.
see:
http://solo11.abac.com/zorroab1/Power28/Powerpage1.htm

73
breck



----- Original Message ----- 
From: "Meir WF2U" <wf2u at ws19ops.com>
To: "'Mike Murray'" <mmurray377 at yahoo.com>; <MRCA at mailman.qth.net>
Sent: Saturday, October 31, 2009 5:29 PM
Subject: Re: [MRCA] T-195 Power Supply Options


|I use a 28 VD, 35 A Lambda military switching supply (no RF interference
| from the supply) to power up my GRC-19 (T-195/R-392). The T-195 in this
| setup  has both the HV and LV solid-state inverter type power supplies
| inside instead of the older type dynamotors. No startup current surge, and
| the 35 A power supply has no problems at all and doesn't even get warm 
after
| hours of operation. On the other hand, my other T-195 which has the old
| dynamotors, won't start with a military 28 V 50 A supply, I have to 
connect
| a pair of garden tractor style batteries (in series), parallel to the 28 V
| output of the supply, with the voltage adjusted just to trickle charge the
| batteries.  This way the T-195 starts up with no hesitation and/or 
groaning
| dynos.
|
| 73, Meir WF2U
| Landrum, SC
|
| -----Original Message-----
| From: mrca-bounces at mailman.qth.net [mailto:mrca-bounces at mailman.qth.net] 
On
| Behalf Of Mike Murray
| Sent: Saturday, October 31, 2009 5:16 PM
| To: MRCA at mailman.qth.net
| Subject: [MRCA] T-195 Power Supply Options
|
| OK, guys, second question:
|
| As some of you know, I recently acquired a AN/GRC-46 with "everything 
except
| the shelter" (as Brown stated it) in VG condition.
| Ted and I took it for a test drive in Gilbert, and I have issues with the
| T-195. The R-392 is excellent, though, so I am happy already.
|
| Vic-K0OUX here in town and I are weighing options for a power supply to 
run
| the T-195 and begin our troubleshooting.
|
| We were wondering how others are running their T-195s and what options we
| have.
|
| We have a 28V 100A power supply and 5 huge caps - 75VDC 60,000uF. The PSU 
is
| switching, however, and we were hoping to limit the surge. Possible? 
Anybody
| know the time constant of the surge?
|
| What else can I do?
|
| I know I need to replicate Ted's awesome supply!
|
| Thanks again guys!
| 73
| Mike
| KW4HF
| Chapel Hill, NC
|
|
|
|
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