[Elecraft] Elecraft K2 Power Readout Discrepency

Mon May 19 11:39:10 2003

Hello Robert
For those of you not using the ATU option, you will find some inaccuracy
in the rf voltmeter approach to power measurement used in the basic K2.
Before the ATU was introduced, we all had this problem, and there was
extensive discussion of it here on the reflector.
If you dig back in the Elecraft archives, you may find the discussions
and some of the recommendations.  I recall changing the diode, and
small changes to the resistor divider were mods that were tried.
73, Bob N6WG

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Robert Boerhorst
Sent: Monday, May 19, 2003 2:19 AM
To: [email protected]
Subject: [Elecraft] Elecraft K2 Power Readout Discrepency

Dear om's,

With reference to the message from Parker, WD9JOL, dated Sunday 18 May 2003,
11:21 on the discrepency between the power out indication on the K2 display
versus power out reading on an external Wattmeter the following:

My K2 #2406, has the same discrepency. The K2 indicated output power is
always about 2 Watts higher than shown on my WM-2 Wattmeter. It varies a
little per band, but not very much. The Reflected power is set for 0 and the
output at the WM-2 is set at 5 W (max. QRP power out). It has been this way
since the first use of my K2 in Feb. 2002. I always work with the output
power as shown on the external powermeter.I get the same figures when using
other output indicators, so I assume, that the WM-2 is giving more or less
the correct figures and the K2 power indicator is giving a too high reading.
It must have something to do with the (simple?) measuring circuit in the K2.
I always work with external homebrew ATU's and most of the time fed with
open line.
I have lived happily with the too high K2 power read-out, but if it can be
made better in a simple way, for instance by changing D9 for a better diode,
I'm interested.

72/73,
Robert, PA0RBO

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