[GreenKeys] 7.00 vs 7.42 unit code

[John, W9DDD]

Everything you say sounds right.

I've suspected that the RX shaft ends up going at the same rate for 
7.00 and 7.42 and 7.50 as long as it's 45.45 baud, but I've never taken 
a set of gear specs to do the math.  What makes me suspect that is I 
think the selector cam is the same.  I read too many manuals and then 
hit information overload.

I have a 7.00 keyboard that I can eventually use to send to a 7.42 
printer.  Wonder if the repeat key results in full speed?  Or I could 
buy that LXD31 on epay.

John, W9DDD
Ich habe dreimal abgeschnitten uns jetzt zu kurtz. (I cut it off 3 times 
and it's still too short.)

On 8/7/2019 9:41 AM, Nick England wrote:
> Doing some machine shuffling this week made me think about this - please 
> steer me back on course if my thinking is off.....
> Truth-
> 7.42 unit code has a start bit and 5 data bits of equal length (1.00 
> unit each) and a stop bit 1.42 units long.
> 7.00 unit code has a 1.00 unit stop bit.
> 45.45 baud code can be either - each 1.00 unit data bit is 22ms.
> So 7.42 unit at 45.45 baud is 60 wpm
> and 7.00 unit code at 45.45 baud is 65 wpm
> There's a chart at http://www.navy-radio.com/tty/speed-feed.gif
> 
> Consequences-
> These two do require different gear sets - you can't just put 60wpm 
> gears (368 opm) into a 7.00 unit machine (390 opm) - that would make the 
> baud rate wrong and your selector and keyboard transmitter timing would 
> be off.
> A 7.00 printer can copy a 7.42 keyboard or 7.42 TD no problem.
> A 7.42 printer can copy a 7.00 keyboard if you don't type at max rate
> A 7.42 printer probably cannot copy a 7.00 TD
> 
> What about sending RTTY with a 7.00 keyboard or TD? - will the computer 
> software RTTY folks copy it OK? I assume so, but don't know for sure.
> 
> Comments welcome.....
> 
> best regards,
> Nick England K4NYW
> www.navy-radio.com <http://www.navy-radio.com>
> 
> 
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