[Elecraft] Heil 4-pin XLR pinout

[Jim Brown]

On Fri, 02 Jul 2010 19:16:39 -0400, Don Wilhelm wrote:

>Check the Pro-audio stores and websites for the XLR connector. 

It should be noted that the only standard within the PRO AUDIO world 
for the wiring of an XL connector with more than three pins is that pin 
1 is the designated shield contact. For a 3-pin XL connector used for 
balanced audio, pin 1 is the shield, pin 2 is positive polarity, and 
pin 3 is negative polarity. 

There are two major mfrs of XL connectors -- Neutrik, and Switchcraft. 
Both are widely distributed in North America. Both are first class 
companies, but Switchraft also makes some cheapies. The high quality 
cable-mounted 3-pin male is an A3M, a 4-pin is A4M. The cable mounted 
females are an A3F and A4F, respectively. The only difference is the 
inserts. AxM shells are identical, all AxF shells are identical. The 
difference is the inserts. 

One good place to buy them is Full Compass, in Madison, WI. 

73, Jim Brown K9YC