KPA500 - key down current on CW

[M0XDF]

Purely as a matter of interest, how much current does the KPA500 draw on CW key down?
73 de M0XDF (K3 #174, P3 #108, KX3 #???)
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[Jim Sheldon]

On my resonant Tribander with 1.2.1 SWR and the bargraph indicating 500W output, mine pulls 11.9 amps with the HV measuring 62.5 volts for a drain input power of 743.75 watts.  The amp is being run on a mains voltage of 240.  Drive power from the K3 indicates 28 watts.

Jim - W0EB

> Purely as a matter of interest, how much current does the KPA500
> draw on CW key down?
> 73 de M0XDF (K3 #174, P3 #108, KX3 #???)
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[M0XDF]

Thank you very much, just what I wanted to know.
73 de M0XDF
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When a distinguished but elderly scientist states that something is possible he is almost certainly right. When he states that something is impossible, he is very probably wrong.
-Arthur C Clarke, science fiction writer (1917-2008)

On 28 Nov 2011, at 16:36, Jim Sheldon wrote:

> On my resonant Tribander with 1.2.1 SWR and the bargraph indicating 500W output, mine pulls 11.9 amps with the HV measuring 62.5 volts for a drain input power of 743.75 watts.  The amp is being run on a mains voltage of 240.  Drive power from the K3 indicates 28 watts.
>
> Jim - W0EB
>
>> Purely as a matter of interest, how much current does the KPA500
>> draw on CW key down?
>> 73 de M0XDF (K3 #174, P3 #108, KX3 #???)

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[Roy Morris-6]

My KPA500 is as follows:
500 watts indicated on LEDs
Current: 10.3 Amps at 500 watts indicated on LEDs
Idling current: (key down - no modulation) 400 ma
Voltage at 500 watts: 59.8v
Power as indicated on display: 530 watts
Power dialed in on K3: 39 watts
Power source: 240v
Freq: 3.781 Mhz
SWR: 1:1

Roy Morris  W4WFB
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[alsopb]

Hmm, this works out to an efficiency of 87%!
Not sure I believe that.

73 de Brian/K3KO


On 11/28/2011 20:34, Roy Morris wrote:

> My KPA500 is as follows:
> 500 watts indicated on LEDs
> Current: 10.3 Amps at 500 watts indicated on LEDs
> Idling current: (key down - no modulation) 400 ma
> Voltage at 500 watts: 59.8v
> Power as indicated on display: 530 watts
> Power dialed in on K3: 39 watts
> Power source: 240v
> Freq: 3.781 Mhz
> SWR: 1:1
>
> Roy Morris  W4WFB
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[Roy Morris-6]

There is a 4 watt discrepancy between the 39 watts dialed in the K3 and the
43 watts that is shown on my PowerMaster meter.  The PowerMaster coupler is
attached directly to the output of the K3 (using a double male connector)
with a 5 foot length of RG8 coax to the input of the KPA500.  The
PowerMaster reading is probably more accurate than the dialed in power.
This could be factored into the efficiency equation.
Calibration of the K3 power is not linear.  Roy Morris  W4WFB

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