[GreenKeys] Data Technology Associates DT500 and DT600

[Nick England]

FWIW, I have scanned the DT-600 manual and posted at
www.navy-radio.com/rtty/conv/dt600-demod.pdf

Tip o' the hat to Leanne W1WXS for the manual.

Nick England K4NYW
www.navy-radio.com


On Mon, Oct 7, 2019 at 8:19 AM w9ddd at tapr.org <w9ddd at tapr.org> wrote:

> Thank you all who responded.
>
> I now have lots of good information.  I even found my original DT-500
> information which mentions the difference between it and the Ham Radio
> article.  The HR article does have a more complete description of the
> theory of operation.
>
> As for the other board it appears to be a half ST-6 I built on perf
> board.  No auto-start section. How did I manage that, I had two young kids
> at the time.  Indian Guides and Indian Princesses and all those other
> activities. I guess it must have been midnight oil.
>
> John, W9DDD
>
>
> On Oct 7, 2019, at 12:00 AM, Jim Pruitt <jpruitt67 at gmail.com> wrote:
>
> 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 <http://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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