[Elecraft] K3 Strange Power Output Problem

[Mark E. Musick]

Hi Ed,
You don't have a transmit problem at all. It is not an anomaly.
The amateur band starts at 10.100 MHz. You shouldn't be transmitting below that frequency. I'm surprised the K3 allowed you to do that.
The K3/K3S gives an out of band error and won't transmit beyond some amount below and above the amateur band limits, I believe allowing for MARS frequencies.
The reason for the relay click and your lower output is due to switching of the bandpass filters in the K3. They are not designed to transmit down there. This is also why you are seeing a reduction in receive sensitivity. You need the BPF3A to receive outside the ham bands. Again, because you are limited by the bandpass filters for the ham bands in the K3.
If you have more questions, let us know here on the reflector and we will try to answer them for you.

73,
Mark, WB9CIF


-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of Ed G
Sent: Saturday, May 12, 2018 7:25 PM
To: elecraft at mailman.qth.net
Subject: [Elecraft] K3 Strange Power Output Problem

Hello,
      I noticed this power output anomaly today while trying to work the NSS station. My K3 was in split mode, transmitting on 10.113.5.  While I was listening on 9.448 (the NSS transmit frequency), I noticed that even though my K3 power level was set at 100 watts, the K3 was only putting out about 20 watts. Two different power meters (the K3 internal meter and an outboard LP-100A) gave me the 20 watt reading.
     When I listened on my transmit frequency of 10.113.5, I was getting the full 100 watts out.  A quick investigation showed that as I tuned my listening frequency down, I got the full 100 watts out until I got to about 9.850 mHz. When I listened below that, K3 transmit power on 10.113.5 dropped immediately down to 20 watts.
     Not sure why I am seeing this?  One additional note – I hear a relay click inside the K3 when I tune my receive frequency below 9.850. I see the anomaly with the subreceiver either on or off.
--Ed—



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