Topband: Digital mode spurious issues

[Mike Waters]

Tom,

I believe the mode that operates at 1873-1838 is JT65, and WSJT is needed
to decode it. I never tried it. It was developed by K1JT for weak-signal
and EME work.
http://www.physics.princeton.edu/pulsar/K1JT/wsjt.html

A common scenario with digital modes is that the audio into the mic input
is too high, causing unwanted spurs.

73, Mike
www.w0btu.com


On Mon, Dec 30, 2013 at 11:11 AM, Tom W8JI <w8ji at w8ji.com> wrote:

> ... a digimode station up roughly around 1837 came on with a LSB
> "spurious" signal on 1833. His signal was a series of slowly changing
> stepped tones. I don't know what mode that was. His unwanted sideband
> suppression was about 40 dB, but that was not nearly enough. He was 15 dB
> out of noise with his unwanted sideband.
>
> Does anyone know of a universal software to decode signals? Since the FCC
> does not require a CW ID, I think that is the only way to identify
> stations. ...
>