[BC] Xmitters at aol.com

[K7qa@aol.com]

In a message dated 4/9/2007 6:41:47 AM Pacific Daylight Time,  
RichardBJohnson at comcast.net writes:

The  circuit feeding the telco pair should not be connected as 150 ohms  
unless
there has been a problem obtaining the required frequency response.  


Most standard balanced telco multiconductor trunk lines used for many years  
had an internal surge impedance of 135 to 150 ohms at audio frequencies. The  
111C had individual 300 ohm windings for a good reason.  Connect the  111C 
transformer split windings in parallel to achieve 150 ohms on the line side  and 
in series for the 600 ohm equipment side. 
 
tm



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