[GreenKeys] Mod 28 Gearing

Ralph Irish w8roi at wowway.com
Mon Aug 12 10:43:13 EDT 2019 

"One of the nice things about Standards is that there are so many to choose from." 

73, 

Ralph - W8ROI 

- - - - - - - - 

From: "Steve Garrison" <steve.n4tty at gmail.com> 
To: "W9DDD' 'John" <w9ddd at tapr.org>, greenkeys at mailman.qth.net 
Sent: Monday, August 12, 2019 10:33:40 AM 
Subject: Re: [GreenKeys] Mod 28 Gearing 

Thanks John, great information to have! 

I'm still puzzled as why there was more than one "standard." 

Especially the 7.00. And the 7.42 & 7.50 are so close (0.08") why bother? 

Steve G./N4TTY 

-----Original Message----- 
From: John, W9DDD <w9ddd at tapr.org> 
Sent: Monday, August 12, 2019 10:23 AM 
To: Steve Garrison <steve.n4tty at gmail.com>; greenkeys at mailman.qth.net 
Subject: Re: [GreenKeys] Mod 28 Gearing 

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 
>> 
>> 
>> ______________________________________________________________ 
>> GreenKeys mailing list 
>> Home: http://mailman.qth.net/mailman/listinfo/greenkeys 
>> Help: http://mailman.qth.net/mmfaq.htm 
>> Post: mailto:GreenKeys at mailman.qth.net 
>> <mailto:GreenKeys at mailman.qth.net> 
>> 
>> 2002-to-present greenkeys archive: 
>> http://mailman.qth.net/pipermail/greenkeys/ 
>> 1998-to-2001 
>> <http://mailman.qth.net/pipermail/greenkeys/1998-to-2001> greenkeys 
>> archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html 
>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: 
>> http://comcents.com/tty/greenkeyssearch.html 
>> 
>> This list hosted by: http://www.qsl.net 
>> Please help support this email list: http://www.qsl.net/donate.html 
>> Message delivered to navy.radio at gmail.com 
>> <mailto:navy.radio at gmail.com> 
>> 
>> -- 
>> 
>> Nick England K4NYW 
>> www.navy-radio.com <http://www.navy-radio.com> 
>> 
>> 
>> 
>> ______________________________________________________________ 
>> GreenKeys mailing list 
>> Home: http://mailman.qth.net/mailman/listinfo/greenkeys 
>> Help: http://mailman.qth.net/mmfaq.htm 
>> Post: mailto:GreenKeys at mailman.qth.net 
>> 
>> 2002-to-present greenkeys archive: 
>> http://mailman.qth.net/pipermail/greenkeys/ 
>> 1998-to-2001 greenkeys archive: 
>> http://mailman.qth.net/archive/greenkeys/greenkeys.html 
>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: 
>> http://comcents.com/tty/greenkeyssearch.html 
>> 
>> This list hosted by: http://www.qsl.net Please help support this 
>> email 
>> list: http://www.qsl.net/donate.html Message delivered to 
>> w9ddd at tapr.org 
>> 
> ______________________________________________________________ 
> GreenKeys mailing list 
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys 
> Help: http://mailman.qth.net/mmfaq.htm 
> Post: mailto:GreenKeys at mailman.qth.net 
> 
> 2002-to-present greenkeys archive: 
> http://mailman.qth.net/pipermail/greenkeys/ 
> 1998-to-2001 greenkeys archive: 
> http://mailman.qth.net/archive/greenkeys/greenkeys.html 
> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: 
> http://comcents.com/tty/greenkeyssearch.html 
> 
> This list hosted by: http://www.qsl.net Please help support this email 
> list: http://www.qsl.net/donate.html Message delivered to 
> steve.n4tty at gmail.com 
> 

______________________________________________________________ 
GreenKeys mailing list 
Home: http://mailman.qth.net/mailman/listinfo/greenkeys 
Help: http://mailman.qth.net/mmfaq.htm 
Post: mailto:GreenKeys at mailman.qth.net 

2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/ 
1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html 
Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html 

This list hosted by: http://www.qsl.net 
Please help support this email list: http://www.qsl.net/donate.html 
Message delivered to w8roi at wowway.com 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20190812/24296cdf/attachment.html>

More information about the GreenKeys mailing list