Topband: Digital mode spurious issues

[Grant Saviers]

The SignaLink supported software page has a nice summary of software 
decoders  see  http://www.tigertronics.com/sl_soft.htm

If "universal" means automatic selection of the correct decoding mode, 
that would be a challenge!

Grant KZ1W

On 12/30/2013 9:11 AM, Tom W8JI wrote:
> I have not been on the air for a year or so, but decided to get back 
> on. I was listening to a DX station around 1833 when 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.
>
> I assume:
>
> 1.) Operators are unlikely to accept they have a problem if they are 
> getting good reports on the intentional signal
>
> 2.) Some rigs just should not be used for digimodes (this was a 
> sideband suppression issue)
>
> 3.) Those who unwisely placed digimode subbands next to popular weak 
> signal areas, especially when sideband selection produces a supurious 
> that falls in weak signal areas, are unlikely to rethink the poor 
> placement or poor advice on selecting sidebands
>
> 4.) With a little work to convince them, most digital ops with radio 
> problems would avoid operating
>
> 73 Tom
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