AC Power consumed by 6400

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I've got a Kill-A-Watt type device between my 13.8 power supply and the AC wall plug.  When I key my 6400 with 100 watts in LSB mode, the Kill-A-Watt registers an increase of about 25 watts.  That doesn't sound right -- the 6400 specs say that the maximum transmit supply current is 23 amps.  At 13.8 volts that should be 317 watts.  What am I missing?

Michael
KM6LHD
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Michael Wheatley

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Posted 1 year ago

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VE7ATJ

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Official Response
Remember that in SSB, the only time you transmit any power out is when you are speaking.  All the power is focused into the actual speech passbands.  When you key the rig without speaking you're only showing a very small increase cause the transmitter has been powered on.  Try the same measurement in CW or AM and I think you'll see the increase you're expecting.

Don VE7ATJ
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Michael Wheatley

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Yes, of course.  Thank you!
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Wayne

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The Kill a watt reads the increase in current on the 120vac supply not on the secondary or output side of the power supply.