I have recently become interested in the WSPR beacon mode
(http://physics.princeton.edu/pulsar/K1JT), which involves transmitting a
continuous signal for periods of 2 minutes. At a level of 5W the underside of
the K3 gets uncomfortably hot. Since this is the sort of thing you want to
leave ru
The output filters are designed to match specific impedances and the
impedance at the power amp output is a function of power. At very low power
levels they are far from their design center.
IMX badly matched output filters are not usually consistent with good
filtering and low spurious emissions
Dave G4AON wrote:
>
> Julian the problem with running low power through a high power PA is
> that you get poor efficiency. A typical HF transceiver running 5 Watts
> output from a 100W PA may be drawing 8 Amps to do so. The Elecraft
> solution nicely improves efficiency and works well for mo
Julian the problem with running low power through a high power PA is
that you get poor efficiency. A typical HF transceiver running 5 Watts
output from a 100W PA may be drawing 8 Amps to do so. The Elecraft
solution nicely improves efficiency and works well for most situations.
73 Dave, G4AON
I believe that the K3 and K2 are unique in that they switch the PA out of
circuit when low power (below 12W in the case of the K3) is used. Why do
they do this? Would it not generate a more linear signal and result in less
stress on the low power PA components if the high power PA was used, where
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