Re: OT Radio antenna (John T)

Posted by Gerald J. on October 08, 2006 at 08:15:35 from (67.0.103.107):

In Reply to: OT Radio antenna (John T) posted by BUDD on October 08, 2006 at 07:02:24:

There used to be switches made for switching between cable and a live TV antenna and between a game box and cable or TV antenna. They worked in coax, had considerable shielding, and shorted the unused ports. IF you maintain the shielding between the switch and the radio AND the radio is shielded they can be effective.

Your wire leads to your switch are small antennas so you get pickup, worse, there is capacitance between those wire leads and in the open switch that at 100 MHz couples considerable signal. Especially the capacitance of the switch (probably as much as 10 picofarads) is comparable to the antenna coupling capacitor in the radio, so it doesn't cut the signal much.

Gerald J.

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