[GreenKeys] Data Technology Associates DT500 and DT600

[Jim Pruitt]

John,  Go to americanradiohistory.com
and find Ham Radio Magazine
https://americanradiohistory.com/Ham_Radio.htm

issue March 1976
https://americanradiohistory.com/Archive-DX/Ham%20Radio/70s/Ham-Radio-197603.pdf

and on page 24 of that issue (not of the PDF but of the issue which is I 
think page 26 of the PDF) is the start of the DT500 article.  They also 
had the DT600 article but did not look to see when or what issue it 
appeared.  I built the DT600 at the time and sold it a few years later.  
I do have another one here and a PC board to build another.  I never 
built the DT500 and as the articles said, it was primarily designed for 
vhf use.

I really liked that DT600.  It was a group of Navy Mars members take on 
a redesign of the ST6.  There were some disagreements about how Irv 
(W6FFC) did some things and parts he used so the group came up with 
something they thought was better.  It is one board.  Data Technology 
sold the pc board which was double sided. Ham Radio Magazine had the pc 
board layout in the articles but it was single sided so it was bigger 
than the double sided version and the magazine article did allowed for a 
loop supply where the DataTechnology version did not really use a loop 
supply but simply RS232 even though personal computers were not really 
heard or (or at least mainstream) at the time.

If you are looking for Ham Radio Magazine articles several sites have 
and have had the cumulative index.  I looked at this one to find the DT500:
https://www.qsl.net/ve3wgx/hr/hrind23.htm


Good luck.

Jim Pruitt
WA7DUY


On 10/6/2019 11:59 AM, John, W9DDD wrote:
> Good afternoon all,
>
> Taking a break from repairing my paper shredder.
>
> I'm doing some downsizing.  Going through boxes of stuff that hasn't 
> been opened of 20 years or more.
>
> So in one of the boxes I find a Data Technology Associates DT500 with 
> no documentation pf course.  I can find the schematic of the DT600 on 
> rtty.com, but not the DT500.
>
> Also in the same box was a similar size board, a DT600, right, no.  It 
> has 5 torroids and the DT600 only 2.  I built this on a perfboard, I'm 
> wondering if I cloned the ST-6 on one board?  I was young and could 
> see what I was doing back then.
>
> Again, RTTY.com has a schematic, but the quality isn't that great.  
> But, I can see that the ST-6 had 7 op amps and I only have 4 on mine.  
> Of course I may have left off the autostart part and that would make 
> sense.
>
> Any help finding either the DT500 schematic or a better one of the 
> ST-6 would be appreciated.  I'm going to start looking through the 
> RTTY Journal archives but not sure which year to start with.

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