[RTTY] 300 baud RTTY

[Joe Subich, W4TV]

> The problem is caused by the resolution of the multi-media timer that
> is used. The resolution of this timer is 1ms, which will give you
> accurate timing up to about 100bd.

In addition, USB has a 1 ms resolution +/- some jitter.  As the data
rate approaches 100 baud, USB errors start to become significant.
Interestingly, if one goes to a 7 bit code (ASCII) and 300 baud most
of the current USB to serial devices will support that in UART mode
so there is no need for EXTFSK at 300/1200 bps (on 10 Meters and up).

73,

    ... Joe, W4TV



On 6/6/2011 4:09 PM, Alex wrote:
> Bob wrote:
>
>> Yes, you are correct that EXTFSK is hard coded to 45.45 baud. It
>> would be great if that restriction could be removed but it doesn't
>> appear that will happen.
>
> The problem is caused by the resolution of the multi-media timer that is
> used. The resolution of this timer is 1ms, which will give you accurate
> timing up to about 100bd.
>
> 73,
> --Alex KR1ST.com
> http://www.airlinkexpress.org
>
>
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