[RTTY] RM-11708 has been amended.

[Peter Laws]

On Fri, Nov 29, 2013 at 5:20 PM, Kai <k.siwiak at ieee.org> wrote:
> Peter,
> You are right - I looked up the ARRL product review, the SSB is BW=2855 Hz
> measured at the 6 dB down points.
> To use 2800 Hz data effectively you would need to add about 100 Hz on each
> side to stay in the flat "linear phase" portion of the pass band, so well
> upwards of 2800 Hz is needed on the receiver and transmitter, perhaps 3
> kHz+(?) to effectively use 2.8 kHz emissions. This starts to be "software
> defined radio territory". SDRs are becoming more prevalent, so we definitely
> can not live without a specified BW limit.

I'm sure 2.8 kHz (or wider!) is common on current rigs but regardless,
we need to limit the bandwidth SOMEwhere and from the traffic here,
2.2 kHz seems a good place to stop.


-- 
Peter Laws | N5UWY | plaws plaws net | Travel by Train!