On 2/21/2014 7:43 PM, WA7SPY wrote:
> What is the recommended max power setting for the amp using PSK31
with a KX3?
In the K3, the limiting factor in some digital modes (notably PSK) is
not thermal capability of the radio or amplifier, it is linearity. The
linearity limit depends on the particular digital mode in use, and it
may also vary depending on the mode used in the radio. For PSK31 and its
higher-speed brethren, using the radio's DATA A mode, power settings no
higher than half the maximum power rating of the transmitter should be
used. This will ensure that the maximum instantaneous peaks of the
transmitted signal are not clipped (in PSK these peaks can be up to
twice as high as the average transmitted power). I can't speak from
personal experience for the KX3, but given the similarity in the way the
transmitter power is controlled, I would expect it to be the same as the
K3. Using the KXPA100, keeping the power setting below 50 watts should
avoid non-linearity.
73,
Rich VE3KI
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