[GreenKeys] Teletype M14 - Marion, VA More Photos

Fri Apr 3 09:24:37 EDT 2015

Were the two channel mux systems async?

Lester B Veenstra  MØYCM K1YCM W8YCM
lester at veenstras.com

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-----Original Message-----
From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of
Duncan Brown
Sent: Thursday, April 02, 2015 10:09 PM
To: greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] Teletype M14 - Marion, VA More Photos

I don't know why this special range finder  intrigued me, but I had to 
find the reason for it - and I did!

It is shown in bulletin 1031, issue 3, Nov. 1940; p34, but 1031 is a 
parts manual, so it's purpose is not given other than the p/n & 
description: "83562  Monitoring Orientation Range Finder (Assembly)"

Further searching turned up an article in  the BSTJ for January 1939: 
"Recent Developments in the Measurement of Telegraph Transmission" See: 
https://archive.org/details/bstj18-1-143
pp171-3 says:

    /"One of the improvements in the machines from the standpoint of //
    //transmission testing consists in the addition of a small crank
    which //
    //extends through the cover and which is coupled to the range finder. //
    //The crank has a detent which assists in making settings to the
    nearest //
    //per cent, the scale being arranged to indicate directly the
    distortion //
    //in percentage of a unit selecting pulse. This crank and scale
    arrange- //
    //ment increases the convenience of measurement considerably." //
    /

The added Range Finder labels make sense now - The farther from center 
you can move the Ranger Finder before garble, the better (lower) the 
distortion. Apparently, if you could move the Range Finder more than 
35-40 points from center, the circuit was considered "0" distortion.

(I still think it would have been good machine to monitor the 
two-channel mux system!)

Have fun,

Duncan
K2OEQ

On 01-Apr-15 14:40, Duncan Brown wrote:
> Steve - Thanks for the pictures!! They show what I wanted to see. You 
> don't need to take any more on my account.
>
> Picture 10 shows the added range labels of + & - 0-35.  What is 
> significant (?) is that "0" is not in the center, so it is not for 
> finding the center of the range on a normal system.  Also interesting 
> is that the two added labels mount and adjust separately.
>
> It looks  to me that it would be good for finding the range of a 
> 2-channel MUX (using XD tape reader) system: the "+" label is for one 
> channel and the "-" label is for the other channel.
>
> Any  other ideas??
>
> Isn't there a BSP that explains this range finder??
>
> Have fun,
>
> Duncan
> K2OEQ
>
> On 31-Mar-15 22:08, Steve Ripper wrote:
>> I have added 11 photos of the tuning mechanism to the album.
>> Not the best, shot in low ambient light, but will re take them this 
>> weekend
>> once I find my studio lights.
>> http://tinyurl.com/qcf43us
>> Cheers,
>> Steve Ripper
>> steve.ripper at gmail.com
>> 248-787-0705
>>
>>
>>
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