[GreenKeys] Mod 28 Gearing

Mon Aug 12 10:22:33 EDT 2019

Hi Steve,

For some reason Teletype documentation doesn't tell us the number of 
teeth on the 3 different keyboard/gear spindle.  (that I've been able to 
find.)

I got that information from a chart that is part of this article:
http://navy-radio.com/manuals/tty/Military_M28_Gears.pdf

Bear in mind that the gears on the tying unit change for 7.00 and 7.50 
vs. the more standard 7.42.

I got into researching this when I found I couldn't swap typing units 
between keyboards.  Turned out one pair was 7.42 and the other a 7.00.

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

On 8/12/2019 9:02 AM, Steve Garrison wrote:
> Are your numbers correct John?  It seems like the number of teeth for 7.42
> would be between the number of teeth for 7.00 and 7.50. Or am I just not
> understanding the gearing?
> 
> Steve G./N4TTY
> 
> -----Original Message-----
> From: greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net>
> On Behalf Of John, W9DDD
> Sent: Monday, August 12, 2019 9:25 AM
> To: greenkeys at mailman.qth.net
> Subject: Re: [GreenKeys] Mod 28 Gearing
> 
> Count the teeth on the keyboard gear.
> 
> 24 teeth - 7.42
> 28 teeth - 7.00
> 30 teeth - 7.50
> 
> John, W9DDD
> Ich habe dreimal abgeschnitten uns jetzt zu kurtz. (I cut it off 3 times and
> it's still too short.)
> 
> On 8/12/2019 8:20 AM, Steve Garrison wrote:
>> Good point Nick.  The keyboard is what generates the signals, the
>> magnets on the printer just respond to whatever they receive.
>>
>> Steve G./N4TTY
>>
>> *From:* greenkeys-bounces at mailman.qth.net
>> <greenkeys-bounces at mailman.qth.net> *On Behalf Of *Nick England
>> *Sent:* Monday, August 12, 2019 5:50 AM
>> *To:* John Lawson <john at tubetestingpros.com>
>> *Cc:* greenkeys at mailman.qth.net
>> *Subject:* Re: [GreenKeys] Mod 28 Gearing
>>
>> BIG question is the keyboard. Is it 7.00 or 7.42??
>>
>> On Sun, Aug 11, 2019 at 11:36 PM John Lawson <john at tubetestingpros.com
>> <mailto:john at tubetestingpros.com>> wrote:
>>
>>
>>      Greetings Greenkeys!
>>
>>      I'm about to order a set of gears for the Tempest Mod 28, which I am
>>      told - (how to verify?) is a 75wpm machine. [hmmmm mebbe it ain't -
>>      best
>>      go check...]
>>
>>      Tom Tillson kindly sent a chart summarizing the gearsets for the 28s,
>>      KSR and ASR.
>>
>>      Of course my goal is to send and copy RTTY at 45 baud with this 28.
>>      It's
>>      a KSR so no re-perf or td.
>>
>>
>>      So, from the chart, there is gearing for 65wpm - 390 opm, 45.5 baud,
>>      7.00 unit code. There is a motor pinion and the driven gear.
>>
>>      Keyboard (LAK)  gearset 173795   consisting of:
>>
>>      Gears:     173794 14 tooth
>>
>>                         173793 100 tooth
>>
>>      Isolator   159287
>>
>>      Posts       161301  (need 2)
>>
>>
>>      Gearing for 60wpm - 368 opm, 45.5 baud. 7.42 unit code
>>
>>      Keyboard (LAK) gearset 161293  consisting of:
>>
>>      Gears:     159278  14 tooth
>>
>>                         159279  96 tooth
>>
>>      Isolator  159287 (same)
>>
>>      Posts      161301 (same)
>>
>>
>>      Paul Cembura suggests  the 161293 / 45.5 / 7.42  set. I had originally
>>      asked him for the 173795 / 45.5 / 7.42 set.
>>
>>
>>      I understand a bit of the relationships involved - but in practical
>>      terms - which is "better"??
>>
>>
>>      Cheerz
>>
>>      John KB6SCO
>>
>>      Carson City NV
>>
>>
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>> --
>>
>> Nick England K4NYW
>> www.navy-radio.com <http://www.navy-radio.com>
>>
>>
>>
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