[Elecraft] K3S IMD Questions

[Jim Brown]

On Sun,8/30/2015 8:22 PM, Scott Manthe wrote:
> Again, the Sherwood TX IMD test that is the basis of the eHam thread 
> is almost 7 years old. 

Study k9yc.com/TXNoise.pdf  which is a comparison of ARRL LAb testing of 
popular transceivers, including the K3. Occupied bandwidth of a CW 
signal is an excellent test of IMD, because CW is 100% modulation of a 
carrier by a square wave, whose infinite harmonics excite IMD. The K3 is 
the cleanest of all rigs tested, and it isn't close.

IMD in a K3 is highest at its highest power setting, and is also highest 
with low DC power supply voltage. Unlike many other popular rigs, IMD in 
the K3 gets even better at reduced output power. Most of the better 
power amps require drive power in the range of 30-50 watts, and having a 
clean signal matters most when you're loud in the other guy's RX. :)

73, Jim K9YC