[GreenKeys] 7.00 vs 7.42 unit code

[John, W9DDD]

I checked the parts section and it only shows two choices for the 
selector cam.  5 level and 8 level.

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 10:36 AM, John, W9DDD wrote:
> 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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