[GreenKeys] Mod 28 Gearing

[Steve Garrison]

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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