Andy,
Thanks, I'm looking for the VDC allowed voltage, unloaded and
loaded. I don't remember the AC, can check it later, but think its 231-232.
Gordon - N1MGO
On 7/6/2022 8:53 AM, Andy Durbin wrote:
"My kpa500 has the taps set to provide 71-72 VDC no load and drops to 60 at 500
watts."
Do you know how your house line input voltage varies? Mine can be as high as
122 and as low as 118 and the local transformer is less than 50 ft from my
house.
I see unloaded KPA500 voltage over 80 with tap selected to keep loaded KPA500
voltage at or above 60. If your loaded voltage does not drop below 60 for all
bands, all antenna loads, and all used output powers, I see no reason to change
the tap. Band, loading, and power output all have a very significant influence
on efficiency, PA current, and voltage drop in the PA HV supply.
Spot check values:
Line voltage 122.0
Unloaded HV 81.4
TX 500 W, 6 m band, SWR 1.15, HV 60.3
Andy, k3wyc
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