axolotl wrote:

john wrote:

Any bad metal to metal connection can act like a mixer diode and cause
intermodulation if other sources of rf are getting picked up by the
antenna.

Magnetic materials do not require an additional source of RF to generate
intermod because the material itself is nonlinear. A "rusty bolt" diode
doesn't need two sources of RF for the same reason.

Kevin Gallimore



The distortion and nonlinear problems occur when the iron is magneticly
saturated. This results in radiation of harmonics of the fundimental
frequency. When another signal is present you get intermod products.
The sum or difference of the two signals and of any modulation that in
on the signals. IF one signal is modulated by a 10kc. tone there wil be
a intermod product every 10kc. away from the fundimental signal at
diminishing powers.


John