KXPA100 not sending 100w

[Mark Tannert]

I have a KX3 / KXPA100 combo. Both are on latest generally available
firmware.

I can run the power calibration process as documented. My dummy load is
100w capable.

After the power calibration process, the amp only seems to put out 60w or
so across the bands. I cannot seem to get it to do more than that. Is there
something I'm missing or am I facing a hardware issue?

Mark, WN8U
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[Cady, Fred-2]

Hi Mark,

Go into the KXPA Utility and bring up the Operation Screen.  The KXPA is pretty sensitive to its supply voltage so you want to check to make sure it isn't sagging below 13.8 volts while you are transmitting.

The Utilities operate screen is really useful to watch a lot of things going on.

Cheers,

Fred KE7X


for all KE7X Elecraft books, see www.ke7x.com


________________________________
From: Elecraft <[hidden email]> on behalf of Mark Tannert <[hidden email]>
Sent: Sunday, July 31, 2016 10:36 AM
To: [hidden email]
Subject: [Elecraft] KXPA100 not sending 100w

I have a KX3 / KXPA100 combo. Both are on latest generally available
firmware.

I can run the power calibration process as documented. My dummy load is
100w capable.

After the power calibration process, the amp only seems to put out 60w or
so across the bands. I cannot seem to get it to do more than that. Is there
something I'm missing or am I facing a hardware issue?

Mark, WN8U
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[Mark Tannert]

Thank you all for the very kind suggestions on the weekend. Ryan (AI6DO)
nailed it with my having somehow bumped the attenuator switch in the back
panel. It was set to "IN". Changing that restored expected operation.

My poor KX3/KXPA100 has been the mainstay of my NPOTA activations this
year, and has taken some mild abuse being transferred from car to shack to
car to shack to car and such. A new HF rig is in the car now permanently
and the KX3/KXPA100 shall remain in the shack.

Cheers and Thanks!
Mark, WN8U
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