[GreenKeys] question about TTY signals and Telephone Signals

[Don Robert House]

Eugene,

The wire is mostly likely 26 AWG and is loosely twisted that may or  
may not meet CAT 3.  You could get by using it for your local loop  
transmissions, providing you do not want to talk on the phone at the  
same time you are sending or receiving.  My suggestion is to do your  
own fishing of the walls and or floor with an electricians drill bit  
and a wire fish tape. Then pull in some shielded 22AWG Belden cable  
between floors.  Ground the shield at the end you are sending from.   
Leave the other end not grounded.

Better safe than sorry.

Don

Don R. House, K9TTY
Retired transmission engineer
Illinois Bell Telephone Co.


On 2 Jan 2006, at 5:06 PM, Eugene Hertz wrote:

Hello all.

I recently purchased a house and in it there is fairly extensive  
telephone wiring. Each room has 6 pair and in the basement there are  
punchdown blocks and a multi-line telephone system. I believe it is  
an analog system as the phones that are used use RJ-11 not RJ-45  
(although that might not tell the whole story). Only 2 pair are used  
for each phone

My ham shack/workshop is in a spare bedroom on the 2nd floor. My  
office is on the first floor. I was thinking of using the existing  
wiring to create a loop from the shack down to the office. Does  
anyone know if the proximity of 60ma current loop signals might cause  
interference to the telephone signals running adjacent to them on the  
same cable? Please note that I might also want to run 60ma polar for  
a teletype ticker model (401?) if that makes matters better or worse.

Please give me your opinions of whether you think this is a bad idea  
to run them together.

thanks
Eugene


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