[GreenKeys] More on Model 29, et al

Wed Feb 14 15:08:12 EST 2018

 Another ham friend who knew the 28 quite well got his engineering degrees from Wayne University (Detroit) in 
the 50s. He must have done fairly well, since they later hired him to teach there. (He had both BS and MS from 
there, and later got an MBA from Michigan State.) 

Around that time, he was the Chief Engineer for the Multi Elmac Corporation. They made a name for themselves 
in the early to mid 50s with AM gear. Their entry into the SSB world stopped with 13 hand built 'prototypes' used 
for demos at radio clubs. A few of them were loaned to clubs for a few Field Days in the mid 60s. It never got into 
production before the company closed their doors. 

- - - - 

He designed an output transformer for a HI FI back then, using ANALOG COMPUTERS that were available at 
Wayne U. (He was the kind of guy who wound his own transformers!) I don't know what the power output was, 
nor the type of tubes , but it sounded great to me. He later duplicated it for STEREO. 

For now, 

Ralph - W8ROI 

- - - - - - - - 

----- Original Message -----

From: "Sam Stinson" <samstinson at gmail.com> 
To: "Roy Morgan" <k1lky68 at gmail.com> 
Cc: "greenkeys at mailman.qth.net" <Greenkeys at mailman.qth.net> 
Sent: Wednesday, February 14, 2018 1:52:19 PM 
Subject: Re: [GreenKeys] More on Model 29, et al 

And remember, they never even heard of a computer! 

Well, not entirely true. Digital computers came about later, but there were analog computers in the late 1800s and early 1900s, including artillery fire control computers as well as various machines for solving mathematical problems such as tide predictions. Thompson’s differential analyzer was described in the 1870s, but not built until the late 1920’s - though the concepts were used for various other machines prior to that. I find it likely as mechanical devices of scientific interest, the teletype engineers would have known of them at least. 

And almost certainly the slide rule - a pocket computer - was in heavy use. 

On Feb 14, 2018, at 10:27, Roy Morgan < k1lky68 at gmail.com > wrote: 

<blockquote>

On Wed, Feb 14, 2018 at 12:04 PM, Ralph Irish < w8roi at wowway.com > wrote: 

<blockquote>

With respect to the friend in Detroit, (1969 and later), his name was (Neil) Doug Frede. 
After noting the link kindly supplied by Nick, 
http://www.navy-radio.com/manuals/tty/jh/ttyman4/AnalysisCharts/LP800-AC.pdf 
I noted references to 'tabbing' both horizontal and vertical, and other typing 'motion' 
situations. 
At one point, Doug put together a 28 Printer that had both online REVERSE PRINT and 
online REVERSE LINE FEED. These were accomplished with Stunt Box sequences. It 
was most amazing to see this machine in operation, doing these 'stunts'. 

</blockquote>

Ralph, 

It seems that Doug was in the league of the folks who designed these machines in the first place! 

As I try to follow the mechanical magic of teletypes, especially the Model 15, I am amazed at how they do what they do. So hats off to the REAL mechanical engineers that did all that. 

And remember, they never even heard of a computer! 

-- 
Regards, 
Roy 

Roy Morgan 
k1lky since 1958 

</blockquote>

<blockquote>

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