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
______________________________________________________________
GreenKeys mailing list
Home: http://mailman.qth.net/mailman/listinfo/greenkeys
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
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 [email protected]