[Elecraft] K Line Power Requirements

[Jack Regan]

Thanks to Ron, Dick, Phil, Don and Jack responses. Very helpful!!

 

RE:          Specifications

1.       Specifications. All came from the manuals!

2.        Jack noted that the KPA500 manual shows "100 to 125 VAC or 200 to
250 VAC, 50/60 Hz, approx. 1000 VA"

3.       I calculated the current by dividing the VA by the VAC. I get 8.3 A
for 120 VAC and 4.13 for 240VAC.

 

Are my calculations correct?

If so, then what is the relationship to the "PA Current 20 A maximum" and
the "PA Voltage 60 VDC nominal" as shown in the manual

 

RE:          The K3PA500 does not run off the 13.8 VDC power supply

1.       The K3PA500 does not run of the 13.8 VDC power supply but in my
shack there is only one 120 VAC circuit so the current
drawn by the K3 and the KPA500 have to be added together if I was to run the
amp with the supplied 120 VAC power cord.

2.       Because of this limitation and the admonition to not run the amp
and rig on the same circuit I ran 240 to my shack to power
my Ameritron AL-811H.  This was a completely independent circuit. I ran my
K3, Yaesu UHF/VH and amp (at 600 to 800 Watts) with no problems.
BTW, when I ran the 240 to the shack I was able to then add a ground to the
old, 1933, two wire 120 VAC circuit!

3.       I am planning on running my KPA500 at 240 but wanted to calculate
the current draw on the house 120 circuit since that is the supplied
cable connection!

 

In conclusion, I think a 25 amp supply would be more than adequate. I am
leaning towards an Astron RS-35M. I like the absence of fans!!!

I would like a smaller, lighter supply and would consider a switching
supply.  I will check the archives for recommendations but if anyone has an
immediate
recommendation I would appreciate it!

 

Jack AE6GC