[Elecraft] K3 fsk D splater

[Jim Brown]

On 5/30/2012 6:39 PM, Rick Bates wrote:
> I answered Adrian off list.

Good response, Rick.  I have two K3s and P3s for SO2R, so I can use one 
P3 to watch the RF output of the other radio.  Transmitting AFSK RTTY or 
JT65 with about 30W out of the K3 driving the KPA500 to full power, IMD 
is at least -45dBC (that is, 45 dB below the carrier).

I don't know enough about how PSK and FSK are generated within the K3 to 
be able to comment on what mechanisms or adjustments within the K3 might 
be generating IMD.  As has been noted, it is well known that K3 IMD does 
rise when the power supply sags, but I haven't seen data on how much sag 
it takes for various levels of IMD. So yes, short beefy copper on DC 
power leads is a VERY good thing.

73, Jim K9YC