Re: Kx3 power output

Posted by Jim Dunstan on Mar 04, 2012; 1:53am
URL: http://elecraft.85.s1.nabble.com/Kx3-power-output-tp7338175p7341401.html

At 09:58 AM 3/3/2012, you wrote:
>Rich is absolutely right on this. Also, since the original question was
>regarding the KX3, I expect the KX3 to behave the same way. Set the drive
>level for the appropriate ALC meter response, and then set the output power
>level where you want it.
>
>73,
>Bruce, N1RX


Hi Bruce,

I expect you are correct ... a different method of setting the
output.  The strategy described by chip is the method I use with my
old Kenwood TS-50.  But since the TS-50 has no ALC indication I used
the monitoring method to determine the amount of drive that initiates
a drop in IMD.  The TS-50 is rated at 100W PEP output on SSB ...
however careful monitoring indicates the IMD drops dramatically
beyond 15W output!   I operate between 10 and 15 watts and get great
reports.  I will have to get used to KX3 method of controlling power output.

Jim, VE3CI

> > While this method of control for PSK31 (set power to maximum and use
> > audio drive controls to adjust output) works well with many rigs, it
> > does not work with the K3. If the ALC meter is showing fewer than 4
> > bars, output power will be unstable, and if the power control is set to
> > maximum, the K3 will do its best to achieve that power level, which is
> > not what you want.
>
> > With the K3 in DATA A (or AFSK A), the recommended procedure is to set
> > the audio drive at the level that results in 4-5 bars on the K3's ALC
> > meter, and then use the PWR control to adjust the output power. You can
> > think of the 4-5 bar point on the K3's ALC meter as the point where ALC
> > is just starting to activate.
>
> > With the K3 in PSK D mode, neither of these methods is possible. In PSK
> > D there is no audio drive to adjust; the only control available is the
> > PWR control.
>
> > 73,
> > Rich VE3KI
>
>
>
>
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