[GreenKeys] Dot cycles per second

[Duncan Brown]

Nick,

Thanks for the article!  I had heard of "Twinplex", but never seen a 
good description of it like was in this article.

I worked on the AN/FRA-86  (aka ASAV-133) DFSK demodulators that must 
have been for Twinplex, but couldn't find any Twinplex signals to copy, 
so never used them other than for normal FSK.

73,

Duncan
K2OEQ




On 11/8/2025 6:51 PM, Nick England wrote:
> This article
> https://www.sigidwiki.com/images/4/4b/Electrical_Communication_Twinplex_March_1952.pdf#:~:text=bauds%20or%2010%20dot%2Dcycles%20per%20second.%20However%2C,center%20holes%20per%20word%2C%20is%20roughly%20twice
>
> Says 10 dot cycles equals 20 baud so I guessed right.
>
>
> Nick England K4NYW
> Chapel Hill NC
> www.navy-radio.com <http://www.navy-radio.com>
>
>
> On Sat, Nov 8, 2025 at 5:42 PM Duncan Brown <duncanancy at earthlink.net> 
> wrote:
>
>     Nick,
>
>     I've never seen the term "dot cycles per second" in military TTY
>     manuals before.  In the introduction of TM 11-2241, it says that
>     the CV-116 will operate at "speeds as high as 100 dot cycles per
>     second."
>
>     Your definition of "dot cycles" seems logical, but that implies
>     that the CV-116 could do 200 baud. In 1955, 75 baud equipment was
>     just becoming available. I don't think there was anything else
>     faster.  TM 11-2241 uses the M15 (TG-7-B) as the example equipment.
>
>     Maybe the CV-116 really could do 200 baud, but the [LOW] switch
>     position was to optimize it for the present day (1955) equipment
>     speeds (45-75 baud).  TM 11-2241, p 15, para 20h of "Preliminary
>     Starting Procedure", says to "Set SPEED switch at the LOW
>     position"  without regard to TTY equipment being used.
>
>     73,
>
>     Duncan
>     K2OEQ
>
>     On 11/8/2025 4:58 PM, Nick England via GreenKeys wrote:
>>     I am reading the CV-116 manual which says select LOW for keying
>>     speeds up to 38 dot cycles per second.
>>     I *think* this is equivalent to 76 baud because a “dot cycle”
>>     consists of a mark plus a space element. Is this correct?
>>
>>     Note. The one thing AI apps are good at is giving an answer that
>>     sounds good, whether actually correct or not.
>>
>>     Nick England K4NYW
>>     www.navy-radio.com <http://www.navy-radio.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 <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 toduncanancy at earthlink.net
>
>     ______________________________________________________________
>     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 nick at navy-radio.com
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20251108/fcbb2bae/attachment.html>