[GreenKeys] Navy Teletype Message Generator

[Jeff G]

Nothin wrong with spitballing - I'm going to take it back out to the garage
and fiddle a bit. One thing I was trying was I had piped a signal gen
through it and to a speaker, and had Fldigi listening via a webcam, but it
couldn't decipher, even putting it mark only mode. I'm going to see if my
logic analyzer can record serial data. I also have one of those old Robot
RTTY keyboards, not sure if that had a loop jack on it but I may pulling
that out and see.

Jeff

On Tue, Jan 24, 2023 at 8:51 PM Daniel Jones <djones at k6yic.com> wrote:

> I probably should have thought about it a little more before I sent the
> last message.  It’s outputting a loop current it sounds like and not audio
> to be converted.
>
> Don’t mind me while I go to the back of the room. Hi hi.
>
> Daniel
>
> www.K6YIC.com
> DJones at K6YIC.com
> HH#11973
>
> On Jan 24, 2023, at 17:37, Daniel Jones <djones at k6yic.com> wrote:
>
> Could it be SITOR by chance?
>
> Daniel
>
> www.K6YIC.com
> DJones at K6YIC.com
> HH#11973
>
> On Jan 24, 2023, at 17:08, Jeff G <jeffg at junknet.net> wrote:
>
> 
> Unfortunately the VOLPE board can't make heads or tails of it either, no
> matter what baud or mode I use. Either the baud rate is wrong or I dunno
> what. In 45 baud mode, it prints gibberish similar but not identical to
> what the machine prints. I may have to take it back out to the garage and
> fire up the logic analyzer lol. Then I can also check to see the
> ASCII/BAUDOT pin on the MM rom to see what mode its actually using.
>
> Jeff
>
> On Tue, Jan 24, 2023 at 4:56 PM <hwhall at compuserve.com> wrote:
>
>> 5815 maps to Federal Supply Classification (FSC) 5815 = Teletype and
>> Facsimile Equipment.
>> Google hasn't made any sense out of the other numbers yet.
>>
>> Wayne
>> WB4OGM
>>
>> -----Original Message-----
>> From: Jeffrey Golas <jeffg at junknet.net>
>> To: Greenkeys <greenkeys at mailman.qth.net>
>> Sent: Tue, Jan 24, 2023 7:40 am
>> Subject: [GreenKeys] Navy Teletype Message Generator
>>
>> Thought you guys and gals might find this interesting...I volunteer on
>> Battleship NJ and found this tucked away. Appears to be Navy-like but
>> mentions "project" on it, serial #3 lol. Other than WMS on the board theres
>> no manufacturer.
>>
>> Its a RTTY/Teletype message generator that does the "quick brown fox"
>> message. Whats really interesting is that all that is based on ONE chip
>> whose sole purpose is exactly that. A MM5220DF. Other chips in that series
>> have similar purposes, like ASCII-BAUDOT conversion.
>>
>> Theres what looks like a white CPU, but Icant find any docs on it. It
>> almost looks like something they had a surplus of, and with no rom,
>> possibly wired it as a NOP (no-operation) so that it would just be an 8 bit
>> counter. I think anyway.
>>
>> It does seen to work after cleaning all the switches, I plan to test on
>> the loop. All it does is keying via a solid state relay. I tried piping my
>> signal gen through it but Fldigi couldnt decode.
>>
>>
>>
>>
>> Jeff KC3GJX
>>
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>
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>
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>
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