[Elecraft] KPA-500 and RTTY

[Joe Hutchens]

I thought about this for a couple seconds...  I have seen some rigs have 
a rather large difference in power out between mark and space tones. 
With a small difference in drive I would expect to see a large 
difference in power out of the amp with these radios.  I've also heard 
some radios with a click between mark and space that makes the signal 
much wider.

Check the output from the K3 and make sure the power out is constant 
between mark and space (don't use a peak-reading watt meter), and make 
sure you don't have any clicks that may be driving the amp harder.

I noticed that your PS voltage has a huge swing.  I'm assuming that this 
is the difference between transmitting and not transmitting.  It should 
be nearly constant while transmitting.