[GreenKeys] Navy Teletype Message Generator

Thu Jan 26 08:17:00 EST 2023

Go to this document and search for “50 baud”.
https://www.navy-radio.com/tty/navelex-tty-1977.pdf

 There are a number of machines that came with 50 baud gears instead of 45
or 75.
Like TT-332A compared to TT-332. I think you have the A model aboard USS
New Jersey.
Nick

On Wed, Jan 25, 2023 at 11:36 PM Jeff G <jeffg at junknet.net> wrote:

> So last update - I tried it with the Volpe board again using a 5v loop,
> and I now realize I can set the Volpe board for the matching baud rates,
> and lo and behold it worked fine. However, it did not work right at 110
> baud. I think the Volpe board has some limitations on stop bits, etc and
> while they say it works with a 33, it didn't work with this thing at all at
> 110 baud.
>
> I poked and prodded it a bit; the UART seems to be used for all 3 baud
> rates, and register settings do change when I change baud rates, including
> 5 bit mode. I think in this case the rom is literally being used as a rom
> and the UART is doing the communication work. Changing the baud rate does
> change the transmitter frequency going into the UART.
>
> I was half tempted to play with clocks and what not but I have other
> projects to work on, so other than maybe trying it with a 33 before I
> return it, it'll prob go back on a shelf somewhere. I know I can reliably
> do the same functionality with an Arduino and a relay shield, so I'll stick
> to that for testing purposes.
>
> For future reference, I was able to look up a TI TMS6011 which was a drop
> in replacement for the S1882 UART for pinouts and info.
>
> So question - maybe for Nick - are there any known Teletypes that run at
> 50 baud in the Navy realm?
>
>
> Jeff
>
>
>
>
>
>
>
>
> On Wed, Jan 25, 2023 at 6:44 PM John W9DDD <w9ddd at tapr.org> wrote:
>
>> You'd need to figure out how to load a different divisor into the BRG
>> register.  I haven't followed the details that closely, but one of the
>> questions I had was does it need to be powered down after changing setting
>> or did it turn out to have some sort of processor?  If it's getting  the
>> setting out of a ROM, the 45.45 stuff might be able n it but not used.
>>
>> John, W9DDD
>>
>>
>> On Jan 25, 2023, at 5:06 PM, W2HX <w2hx at w2hx.com> wrote:
>>
>> Thinking about my suggestion, it would probably adversely affect the 110
>> baud rate which you may want to preserve. It might be possible to re-strap
>> the uart for 45 baud if you are able to find any documentation on the chip.
>>
>>
>>
>>
>>
>> 73 Eugene W2HX
>> Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos
>>
>>
>>
>> *From:* greenkeys-bounces at mailman.qth.net <
>> greenkeys-bounces at mailman.qth.net> *On Behalf Of *W2HX
>> *Sent:* Wednesday, January 25, 2023 4:49 PM
>> *To:* Jeffrey Golas <jeffg at junknet.net>
>> *Cc:* Greenkeys <greenkeys at mailman.qth.net>
>> *Subject:* Re: [GreenKeys] Navy Teletype Message Generator
>>
>>
>>
>> I bet you can change the crystal on that board and get 45 baud out of it.
>>
>>
>>
>>
>>
>> 73 Eugene W2HX
>> Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos
>>
>>
>>
>>
>>
>> *From:* Jeffrey Golas <jeffg at junknet.net>
>> *Sent:* Wednesday, January 25, 2023 1:38 PM
>> *To:* W2HX <w2hx at w2hx.com>
>> *Cc:* Daniel Jones <djones at k6yic.com>; Greenkeys <
>> greenkeys at mailman.qth.net>
>> *Subject:* Re: [GreenKeys] Navy Teletype Message Generator
>>
>>
>>
>> Yeah I hooked it up to a 5v loop and logic analyzer last night, and sure
>> enough 50 baud is EXACTLY 50 baud. It sends baudot for the first two and
>> ASCII for 110 baud. Seems like it works!
>>
>>
>>
>> Attaching pics for fun and profit.
>>
>>
>>
>> Jeff KC3GJX
>>
>>
>>
>> <image001.jpg><image002.jpg><image003.jpg>
>>
>>
>>
>>
>>
>>
>>
>> On Jan 25, 2023, at 10:24 AM, W2HX <w2hx at w2hx.com> wrote:
>>
>> 
>>
>> Maybe try adjusting your range finder? Front panel says 50 baud not 45
>> baud?
>>
>>
>>
>> Sent from Nine
>>
>>
>> ------------------------------
>>
>> *From:* Jeff G <jeffg at junknet.net>
>> *Sent:* Tuesday, January 24, 2023 9:26 PM
>> *To:* Daniel Jones
>> *Cc:* greenkeys at mailman.qth.net
>> *Subject:* Re: [GreenKeys] Navy Teletype Message Generator
>>
>>
>>
>> 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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>>
>> 2002-to-present greenkeys archive:
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>>
>> 1998-to-2001 greenkeys archive:
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>>
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>>
>>
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>> ______________________________________________________________
> GreenKeys mailing list
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>
> >>> Jordan Spencer Cunningham's GreenKeys Search Tool:
> https://teletype.net/gksearch
> >>> 2002-to-present greenkeys archive:
> http://mailman.qth.net/pipermail/greenkeys/
> >>> 1998-to-2001 greenkeys archive:
> http://mailman.qth.net/archive/greenkeys/greenkeys.html
> >>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
> http://comcents.com/tty/greenkeyssearch.html
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to navy.radio at gmail.com

-- 
Nick England K4NYW
www.navy-radio.com
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