[ARC5] A pair of questions

[Scott Robinson]

A switcher rated for 75A might be cheaper, but of course it can be a 
source of RF noise.
/scott

On 11/13/17 12:57 PM, Michael Hanz wrote:
> 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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