[GreenKeys] Dovetron MPC-1000CR/T "Regenerative Tempest" MIL-SPEC RTTY TU

[Roy Morgan]

On Nov 29, 2012, at 5:10 PM, Rainer Haack wrote:
> ...
> What does the text  "Speed conversion is progammed OFF" on  
> declaration sign of the military unit means and how can the speed  
> conversion switched to ON?

Rainer,

Not sure.  Quite possibly there is a jumper or one of the "DIP  
switches" to set.  A DIP switch looks like an 8- or 16-pin integrated  
flat pack circuit but has movable bits in the middle.  See below.

> How - if its possible - can I make a loop support for the TTY?

The "/T" in the units designator means "tempest".  This is a  
complicated system of reducing electromagnetic (and acoustic)  
radiation from communication equipment so "the enemy" cannot easily  
detect what is being handled.  In the case of teletype equipment, it  
means that the signals going between machines and electronic system  
parts is low level (Low voltage, low current).  Your unit has no high  
level loop supply.

Follow the link offered by CORYHOUSE for an easy to build simple  
gadget that will do the job:
"Nagle has an rs 232 converter on his  site

http://www.aetherltd.com/connecting.html

I would say if he has it up there is  is a good one and well tested by  
him."

> There is no loop socket but a FSK socket on its back.

The FSK socket (BNC, I am sure) has audio tones coming from it to feed  
the audio input to a transmitter (usually an SSB transmitter).  There  
are also two other connectors that send out digital signals according  
the the RS-232 standard ("EIA -12M +12S" as I see on a picture here),  
or the corresponding military standard ("MIL +5M  -5S")  These three  
BNC connectors are enclosed by a stripe marked "OUTPUT"

You need the document MPC-1000T.pdf to help you figure all this out,  
and find what it takes to turn the speed shifting on.  (I can send if  
you don't find it online.)  Try:
www.hypertools.com/dovetron/Dovetron_MPC-1000T.pdf
www.alldatasheet.com/view.jsp?Searchword=MPC-1000T
ebookbrowse.com/1000t-pdf-d70475362
ebookbrowse.com/dovetron-mpc-1000t-pdf-d59085679


That manual says:
"The speed conversion (SPEED CONVERT) switch S5 will normally also be  
left in the ON (forward) position, but may be set to the OFF position,  
depending on the operator's requirements "

I have a diagram of an adapter by WA2HWJ, though it does not have  
isolation for the loop current.

Roy

Roy Morgan
k1lky at earthlink.net
K1LKY Since 1958 - Keep 'em Glowing!