Chuck,
The instruction cited was for a 400-500 ma rise TOTAL (not per device).
So I conclude your bias is set too high or there is a problem in the
bias circuit.
73,
Don W3FPR
On 3/7/2019 9:31 AM, hawley, charles j jr wrote:
Thanks for the info. Using xmit for the low power amp and then going to the
high power amp shows a difference of 1.05A. So my devices are showing about
500+ ma each. In the ball park.
Thanks so much for the reply.
Chuck Hawley
[email protected]
Amateur Radio, KE9UW
aka Jack, BMW Motorcycles
________________________________
From: [email protected] <[email protected]> on behalf
of Mike Harris via Elecraft <[email protected]>
Sent: Thursday, March 7, 2019 5:43 AM
To: [email protected]
Subject: [Elecraft] Fwd: AW: K3 KPA3 bias adjust
Hi,
Forwarded a 2009 email exchange for your info. I have NOT tried this so
use with care and at your own risk.
Regards,
Mike VP8NO
-------- Forwarded Message --------
Subject: AW: [Elecraft] K3 KPA3 bias adjust
Date: Sat, 3 Jan 2009 19:46:55 +0100
From: Koppendorfer Klaus <[email protected]>
To: Jan Erik Holm <[email protected]>
CC: [email protected] <[email protected]>
Locate the BIAS pot at the front of the KPA3, between the heat sink and
the KPA3 shield. Note what the display current is in the VFO B readout
when you tap the Display button and turn the VFO B knob to the current
readout. In RX, it should be 1.0A or so. In XMIT (not TUNE), it should
be about 1.90 to 2.0A when the Power knob is set to 12w or above so the
KPA3 is made active (but there is no RF output since XMIT is used). Or
you can press the PTT button but do not speak.
If there is much more current than this, set the BIAS pot to minimum
(fully counter clockwise). Then tap XMIT (not TUNE) and note what the
current is in VFO B's readout. Slowly turn up the BIAS pot until you see
400-500mA more current that was seen with the BIAS pot at minimum.
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