[GreenKeys] 73 Mag article

[Ralph Mowery]

----- Original Message ----- 
From: "Larry" <Telegrapher at Q.com>
To: <GreenKeys at mailman.qth.net>
Sent: Monday, December 01, 2014 6:48 PM
Subject: [GreenKeys] 73 Mag article


> From the March 1971 issue of 73 mag.
>
> Page 65 in this issue is an article "Reading 5 code RTTY in Binary".
>
> First you would make up a table of all the characters and alphabet from 
> the 5 level code.  You then read the tape that you have punched and then 
> assign that binary total to each character in the table. As an example 
> "LTRS" has all 5 bits punched.
> 11.111
>
> On the tape the first 2 holes binarily would have a total of 3.  The next 
> 3 holes would total 7 so "LTRS" would be a 37.  Another example would be 
> the letter "R".  There is only one hole punched of the first 2 places so 
> it would ahve a number 1.  The 2nd set of bits would have only the middle 
> hole punched which would be the number 2 so the number assigned to the 
> character "R" is 12.  01.010
>
> A 3rd example would be the letter "Y".  It would look like this on the 
> tape: 10.101 with the period being the feed hole.
> Binary total for this one 25.
>
> Follow the same procedure for all other characters and symbols.
>
> Be sure and write the binary numbers down next to each letter/character so 
> you will have a fast easy reference for reading your tape, providing it's 
> not already typed on.  However the printing is not in step with the actual 
> holes as punched iirc?
> Counting the holes and assigning the values starts from the left side of 
> the tape, the outside edge of the part with two holes is marked as 2, then 
> 1, then across the feed hole it is 4, 2, 1 for values.
>
> Now is everyone confused?  I am but i have the article so i can refer to 
> it.
>
> Lots of rtty articles were written in the 70's in 73 Mag. due to folks 
> experimenting with the new stuff, multi purpose chips.
>
> Larry
> W0OGH
>

I read the artical and see what he is doing, but do not see the point of it.
In the 70's and 80s' 73 Mag did have lots of good articals, especially for 
rtty.  I subscribed to it from about 1977 to they quit.  I really hated that 
they quit.  Lots of good construction articals for rtty, computers and a few 
other things that are not usually covered in some of the others.  Ham Radio 
was another good magazine during that time for technical articals.

I don't recall where I found them, but they are on the internet in PDF 
format.  Popular Electronics is also, but I have not downloaded it. Started 
reading that magazine around 1960 when I was 10.



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