[ARC5] A pair of questions

[Michael Hanz]

On 11/13/2017 3:06 PM, Craig wrote:
> A couple of questions for the collective knowledge. I'm starting to 
> look for a decent bench power supply for my gear. I've gone thru the 
> books and added up the power requirements for running the planed 
> system and all was well until I hit the power requirements for the 
> SCR-269. Holy smokes, it really jumped the current needs....The 
> dyamotors for the -269 really drive up the requirements. A PE-89 
> requires a 20 amp circuit and it's alternate, a PE-109 requires a 35 
> amp circuit.
>
> So, anyone have a suggestion for a bench supply that will provide 75 
> amps at 24 VDC, and not break the bank? Batteries are out due to the 
> needs for out gassing control and space.

You don't really need a 75 amp power supply per se for those loads. What 
you need is a power supply that will provide a surge rating of perhaps 
75 amps to start the dynamotors, which means it will have to be a brute 
force supply.  The only regulated model I know of is the PP-1104*.  It 
puts out 50 amps at 28vdc 24/7, but has easily started a big 400Hz 
inverter in no-load testing that was rated at 100 amps input at full 
power out.  It has an 8" fan in the rear, so it does have some blower 
noise, but it's not obtrusive.

> Second question.. Anyone have a copy of the manual for the RC-55 Test 
> Set that they would be willing to copy, or know where I could find 
> one? As the chance of me finding the pieces to assemble one, at an 
> affordable price is probably very close to zero, I'd like to build my 
> own replica. Copying expenses would be covered.

I've never seen a manual for the RC-55.  However, I think just about 
everything you'll need is in my documentation section.  See 
http://aafradio.org/docs/Command_Set_Test.html _and_ the link to the 
RC-55 page at  http://aafradio.org/docs/ARC_Test_Sets.html

            73,
  - Mike  KC4TOS
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