[Elecraft] PSK31 -- ghost image:

[John-Morrow]

Jim W7RY wrote:

> This is a VERY common problem with AFSK type operation on HF digital
modes.
> Folks that run AFSK RTTY have that same issue IF
> they have the processor on or overdrive the microphone input of their
radio.
> 2KHz is the modulating frequency of their digital signal or AFSK. It's
> called an image as you have correctly stated. I wish AFSK were
illegal!

A few weeks ago I heard an rtty station with a 170Hz shift signal on one
frequency
and a 240 Hz shift inverted signal a few kHz higher. The funny thing was
he was
answering those that called on either  frequency! :-)

73
John Morrow  GI4KSH