[AMRadio] Re: GB> Re: IARU bandplan

[Bry Carling]

I have heard that none of these "digital voice" schemes works well 
for amateur HF still, unless the and conditions are near perfect.

Long live AM !!

> There has been a number of experiments on the HF bands over the last
> several years using digital formats on phone using 3 KHz or less. AOR
> has
> had their ARD9800 and ARD9000 boxes out in the ham marketplace for
> several years. They digitize the signal and divide it into 36 PSK type
> signals and sends it over a typical SSB bandwidth. Maybe, for good
> quality AM, maybe more sampling (dividing into PSK signals) would be
> required. 
> http://www.aorusa.com/other.html
> 
> They're pushing SSB use but don't know if anyone has tried them on AM.
> Here's a PDF that was written up for QST back in 2003 on digital audio
> and amateur radio applications. There was some 20 meter (I believe) on
> the air experiments between Ten Tec and some company in France using
> some
> of the application info.
> http://www.arrl.org/tis/info/pdf/x0301049.pdf
>