I want to build a J-Pole for 1090 MHz, but the small size and only 1/4 inch separation from the element to the stub is creating a rather difficult problem, as I was planning on using brass compression tee, and 3/8 copper tubing.
As I understand it, the J-pole is resonant on its designed frequency as well as its harmonic frequency (f*3).
Would it work to design one for 363 Mhz, which would be larger, and use it on the harmonic for 1090 Mhz?
Also, all the coax coils used to prevent the feedline from radiating in the diagrams are for 2M (5 loops). What would the formula be for 1090 MHz?
As I understand it, the J-pole is resonant on its designed frequency as well as its harmonic frequency (f*3).
Would it work to design one for 363 Mhz, which would be larger, and use it on the harmonic for 1090 Mhz?
Also, all the coax coils used to prevent the feedline from radiating in the diagrams are for 2M (5 loops). What would the formula be for 1090 MHz?
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