[GreenKeys] Radio up and working... Question...

[Stan Wilson]

Hi Lar,  Can not think of RTTY in terms of bauds and words per minute.
In the USA we have three speeds available in our machines.  60, 75 and
100 wpm are the standard.   Typically a machine being used in ham radio
is a 60 or 100 wpm mechanical device.   In Europe many of the machines
were 66 wpm.

A US 60 wpm machine will have 22 ms marking pulses and a stop pulse of
31 ms.  Those are the most common in amateur radio use.

American Bell     65 wpm   45.45 baud
Europe            66.67 wpm  50 baud
US Miltary        61.33 wpm  50 baud    stop pulse is longer
American Bell     76.67 wpm  56.88 baud
American Bell     100 wpm    74.2 baud 

I recommend picking up a used RTTY manual on ebay    They go cheap and
will cover both the mechanical and electrical information on available
machines.

It is easy to build up a UART circuit and convert the lower speeds for a
high speed machine(printer).    Going the other way requires a buffer.


Someone else may have a better answer.

Stan ak0b


-----Original Message-----
From: greenkeys-bounces at mailman.qth.net
[mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Larry Tighe
Sent: Saturday, November 15, 2008 10:14 AM
To: duncanancy at earthlink.net; Don Robert House;
greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] Radio up and working... Question...

How do you convert Bauds to WPM?  Great list, thanks.

lar
K2JIA
================================
Subject: RE: [GreenKeys] Radio up and working... Question...


 There is a RTTY frequency list at http://www.rtty.com/rtty_list.htm
--Duncan

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