[GreenKeys] question about TTY signals and Telephone Signals

[Paul Wills]

----- Original Message ----- 
From: "Eugene Hertz" <ehertz at tcaf.org>
To: "GreenKeys" <greenkeys at mailman.qth.net>
Sent: Monday, January 02, 2006 6:06 PM
Subject: [GreenKeys] question about TTY signals and Telephone Signals


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.

I've done it for years here.  Everything shares a common MDF in the 
basement.  It worked that way on the railroad too.  Just be sure to keep the 
"outbound" and "inbound" wires of a loop in one twisted pair.

PDW