[TowerTalk] bip/bop, imho, etc

[Dennis OConnor]

 The point that keeps rattling around in my head when I read these discussions is the assumption of the bip-bop folks that inserting a half wave of coax to one feedline creates a 180 phase shift between the two antennas... Given that the two antennas are coupling which changes their impedence and reactance, and given the two antennas are different heights above ground which changes their impedence and reactance, I doubt that the resultant phase difference is the expected 180 degrees...  
While there will obviously be a difference in the pattern with the inserted coax on one line it is not likely to be the expected pattern...
Perhaps one of our bip-bop operators on this list could insert sampling transformers at the feedpoints and run the signals back to an oscilloscope and enlighten us with pictures...  Or, one of our resident electronic cognoscenti (roy, al, tom, etc.) could do the analysis... It may be that bip-bop patterns could be improved with a simple change in the length of the inserted delay line...

denny


		
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