Bill
I run a similar setup portable and have played around with various ways to link the radio and amp. I also run an FTDX5000 as my main base station with the Expert
Firstly make sure that you have ALC turned off on the K3 otherwise the amp will attempt to set the drive to achieve one of the three set output levels.
Secondly I would not worry too much about what the amp says it's input level is. I never get correlating results between the amp and my new LP700 (very nice bit of kit) on either the input or output.
Give that a try and also try varying the drive from the K3. If the output stays the same thats going to mean the ALC is controlling the drive
Trevor
MØTDZ
Message: 24
Date: Sun, 10 Sep 2017 14:10:02 -0700
From: Bill Frantz <
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To:
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Subject: [Elecraft] K3 and Expert 1.3K-FA amplifier power
Message-ID:
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I have just set up an Expert 1.3K-FA amplifier with my K3 (with
most of the upgrades to become a K3S). My question is, when I
drive it with 10W set on the K3 output power, it shows a drive
level of about 30W and and output level of 950W. What is going on?
Details: The two boxes are connected with about 6' of RG-58 for
the RF and a custom cable made by KC5PCB, Dan Tassell for the
rest of the signals. The output is into a dummy load, although
very similar measurements occur with my trapped vertical
antenna. Tests were in the CW portion of the 20M band.
The Amp is powered from a dedicated 120V circuit which shows a 7
volt drop at 12.7A during CW key down transmission. (Voltage is
measured by a Fluke 87 DVM and current by a Kill-A-Watt PA4400.)
An external YS-60 power meter shows 800W, which seems reasonable
agreement given the accuracy of RF power measurements.
Why does the K3 show 10W and the amp show 30W? Is there
something screwy here, or is it normal?
73 Bill AE6JV
2EØLDZ
Trevor Clapp
M. 07900 49 77 11
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