[GreenKeys] question about TTY signals and Telephone Signals

[KC0NNC at aol.com]

Eugene:

I would suggest trying it, before you judge it.  If the rise time of the 60 
ma pulses is steep, then you might see some pulse noise  getting through to the 
telephone audio. this will sound like the old ignition noise we got used to 
when we did  not use resistor spark plugs.  also

Sort of depends if the telephone system that you are using is one of the 
newer solid state ones or one of the old western electric non-electronic units 
such as the 2500 series.  Generally if the home phone is a boat anchor, it will 
be one of the better units.

I make a point in purchasing the old style western electric touch tone 
phones, as they were electrically balanced phones, and would reject such 
interference.

I watch for them at ham fests etc...

you can lessen the pulse skirt steepness of the rtty equipment with L/C  
circuits, and/or place pulse shaping networks across the input terminals to the 
selector magnets, and reduce this type of "pulse noise"  you just have to 
experiment with it.

But I can assure you, you won't burn up the telephone. or the house telephone 
 wiring by experiimenting 

Also the 6 pair your house is wired with sounds like the old 1A1 and 1A2 
office key system wiring. ( I also wired my former QTH with this readily available 
wire.  This also might be the old CAT-3 wiring.  again, easy to get at ham 
fests or on the open market. the fact that they only used two of the pairs might 
mean that they had two teleco circuits coming into the house one for fax and 
the other for voice. generally speaking the new electronic phones have the 
ability to work on one pair even if they are the multi function multi line units 
made by Panasonic etc.

Hope this info is helpful.



Harvey E. Smith
2020 Baculite Mesa Road
Pueblo, CO., 81001-2456
fka WA0BBG
nka KC0NNC

73's

RYRY/ZZZZ