Hi Mark! I am transmitting on 10.113, and I do not change this. I am in Split
mode, listening for NSS (who is transmitting on 9.448). I am only seeing about
20 watts out, even though the K3 Power setting says 100 watts.
If I change my RECEIVE frequency – not my transmit frequency – once I get above
9.850 on RECEIVE, my power out returns to the expected 100 watts.
--Ed—
Sent from Mail for Windows 10
From: Mark E. Musick
Sent: Saturday, May 12, 2018 4:36 PM
To: 'Ed G'; elecraft@mailman.qth.net
Subject: RE: [Elecraft] K3 Strange Power Output Problem
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-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> On
Behalf Of Ed G
Sent: Saturday, May 12, 2018 7:25 PM
To: elecraft@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—
Sent from Mail for Windows 10
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