Isocoupler
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Please be aware that using an Iso-coupler or installing any antenna on an AM tower can change the impedance of the tower and trigger the need for a proof, especially if you're doing this on a tower that's part of a directional antenna system.? The Iso-coupler will add a shunt capacitance to the tower and the antenna can also change the base impedance and current distribution of a tower.??
An ISO-coil can add a shunt inductance and may need a parallel capacitor to detune it at the stations operating frequency. Be careful when fooling with AM towers. Burt, K6OQK |
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Amen to that Bruce....a single tower is usually pretty easy to work with using the ATU at the base...but in a Directional Array, it can be a nasty issue.... Stations at the low end of the band have taller towers than those at the high end of the band and are usually directional. The shorter towers are somewhat useless as you can find a higher communications tower.. More and more AM operators are looking at leasing out space on their towers to cell operators... But I doubt they would be open to allowing a ham or even commercial repeater on it. Not enough money ? Chris WB5ITT? On Sun, Nov 6, 2022, 8:49 AM Burt K6OQK <biwa@...> wrote: Please be aware that using an Iso-coupler or installing any antenna on an AM tower can change the impedance of the tower and trigger the need for a proof, especially if you're doing this on a tower that's part of a directional antenna system.? The Iso-coupler will add a shunt capacitance to the tower and the antenna can also change the base impedance and current distribution of a tower.?? |
Burt K6OQK
Chris Boone WB5ITT