Posted by
Stephen W. Kercel on
Sep 25, 2006; 10:58pm
URL: http://elecraft.85.s1.nabble.com/More-information-Need-help-with-fluctuating-power-output-on-K2-tp386379p386394.html
Elecrafters:
The seemingly peculiar behavior that I have been observing on 80 M
turns out to be normal for a K2.
Gary at Elecraft sent me the following message.
73,
Steve
AA4AK
This is just due to the bandpass filter rolloff and the way the ALC in the
K2 works. If you test the rig in transmit by using the Tune button, the rig
will be able to measure and set the RF level better. Some bands have more
overall power gain than others. So it is often necessary to transmit for a
short time with the Tune and Power knobs to ensure the desired RF output is
being produced.
An improvement in the ALC action and power control accuracy for a specific
K2 can be had by doing the modifications shown here:
http://www.elecraft.com/Apps/Power_Control_Mod.html--
73, Gary AB7MY
=========
[hidden email]
Elecraft Technical Support
At 10:07 AM 9/25/2006, Geoffrey Mackenzie-Kennedy wrote:
>Stephen W. Kercel AA4AK wrote:
>
>>I have a strange problem with my K2/100 on 80 meters.
>>
>>The situation is as follows:
>>
>>I work QRP DX at the low end of 80 M, (say 3508 kHz or thereabouts)
>>with a requested power of 4.5 watts, and get an indicated 5 watts out.
>>
>>I then check into the Pine Tree Net on 3596 kHz and crank up the
>>requested power to 10 watts (this is before the relay clicks; I'm
>>still in QRP mode), and I get about 10 watts out. So far so good, right?
>>
>>Then I go back to 3508 kHz, without resetting the power request
>>level knob, but the rig puts out 5 watts, even though the display
>>acknowledges my ten watt request. If I go back to 3596 the output
>>goes back to 10 watts in agreement with the requested level.
><snip>
>>
>>Has anyone else run into this phenomenon?
>
>-----------------------------------------------------------------
>
>Steve,
>
>After checking I find that my K2/100 #3255 behaves in the same way
>on 80m when feeding a good dummy load. - do not have any 80m
>antenna. As you say the problem does not appear to arise on other
>bands. I notice other strange behaviour on 80m related to 'power
>request', but I would need to run various tests before making any comment.
>
>73,
>Geoff
>GM4ESD
>
>
>
>
>
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