[TenTec] "Tuning" antennas; baluns

[Ronald D Rossi]

>>>Chester Alderman said:
>...... 
> 
> Your correct. Reflections from the ground will change the resonant frequency >of the antenna wires, be it a dipole type antenna or a loop type antenna. >LESSON: Always try to raise your antenna to the height that your going to use >it, and then cut it to the resonant frequency that you want. If you can't >reach the antenna, when it's at the height that you are going to operate it, >you can cut the transmission line (either coax or open wire line) to a half >wave length (or multiple half wave lengths), connect the transmission line to >the antenna, and measure the resonant frequency of the antenna, down at the >input to the transmission line. The reason you can do this is because the >impedance seen at one end of a half wave length line exactly repeats at the >other end.

I am really enjoying this thread. A bit of myth and legend sprinkled in with 
fact and theory. Refreshingly off topic =:-) Anyway...

Won't the REFLECTIONs from ground change the pattern of the antenna, while the 
capacitive COUPLING to ground will detune the antenna by acting as a linear 
load of sorts?

-- 
73 de KK1L ex N1PBT...ron (rrossi@btv.ibm.com) <><
Ron Rossi H/P SRAM Engineering -- IBM Microelectronics
QTH: Swanton, Vermont



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