[Elecraft] PSK31 -- ghost image:

[Jim W7RY]

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!

Most of the time the offender will try to tell you it's your receiver.
(There is NEVER anything wrong with their transmitter). Just ask someone who
splatters +- 10KHz on SSB.

73
Jim W7RY

----- Original Message -----
From: "Martin AC6RM" <elecraft@ac6rm.net>
To: <Elecraft@mailman.qth.net>
Sent: Thursday, February 13, 2003 9:11 PM
Subject: [Elecraft] PSK31 -- ghost image:


> I've just started playing with PSK31 with the K2 and a rigblaster Nomic.
> I noticed something strange today.  A station appeared strongly just above
> 14071 kHz, but the station also appeared almost 2kHz higher in the band as
> well.  I'm using digipan 1.6 which allows you to watch two QSOs at the
> same time.  They were both the same station -- character-for-character.
> Is there something wrong with the way that I have set up my equipment?
>
> Tks in advance, and 73,
>
> Martin AC6RM K2#3021
>
>
>
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