[GreenKeys] Navy Teletype Message Generator

Wed Jan 25 23:36:05 EST 2023

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
>
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
>
> >>> 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 hwhall at compuserve.com
>
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
>
> 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 djones at k6yic.com
>
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net <GreenKeys at mailman.qth.net>
>
> 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 w9ddd at tapr.org
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20230125/5502c2f6/attachment.html>