[GreenKeys] Data Technology Associates DT500 and DT600

[w9ddd at tapr.org]

I can eventually provide the DT500 manual unless someone beats me to it.

 I'm swamped most of this month trying to close out a storage locker and make some room in the garage.  That means a lot of shredding and parting with items I'm sure to need within the next year.  

John, W9DDD


> On Oct 7, 2019, at 3:22 PM, Nick England <navy.radio at gmail.com> wrote:
> 
> 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 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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