Performance of baluns.
Posted by
Geoffrey Mackenzie-Kennedy-2 on
Aug 06, 2004; 4:47pm
URL: http://elecraft.85.s1.nabble.com/Performance-of-baluns-tp455789.html
Hello all,
Have noticed over the recent years that current baluns are used in places where the load/source Z is not purely resistive (OK will allow a little reactance) , example - an incoming transmission line that looks like R +j (quite a lot) goes to a balun then the to an ATU then to the TX. I was brought up to understand that in such a case, outgoing transmitter power would NOT result in equal and 180 degrees out of phase currents on the transmision line wires. i.e. the antenna would see an "unbalanced source" I was always told to put the balun between the Tx and the ATU, and to make sure that the ATU presented the balun with a R +/- j0 load , or simply put was "tuned up". (Loved those swinging links).
I appreciate that there are a lot of "but ifs", but was Teacher right in the fundamentals? If so, it might go some way to explain why some antennas that are looking for a balanced feed are misbehaved.
73
Geoff GM4ESD
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