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In stead of propagating inside the apparatus, most of the radiation leaks
outsides and then turn into interference through the antenna. In a situation
where the antenna is not connected, only relatively minor remnant response
would appear on the spectrum. And power source interference would not
appear. Consequently, the major method to lower the interference is
perfecting the isolation for the antenna.
(1) Prefer balanced antennas if possible. Non-balanced antennas could
possibly make the shell involved in the transmitting/receiving process,
consequently worsening the interference.
(2) Avoid the utilization of loaded antenna, especially those with
inductance at the root of the antenna. Loaded coil's extra sensitivity towards
magnetic field would worsen the interference. The effect reveals itself most
while using radial helical antennas (spring anatennas).
(3) DO NOT point the transmitting/receiving direction of the antenna
towards the apparatus. Instead, this direction should be paralleled to KC908,
or just keep a distance between the antenna and the apparatus. As the pics
shown below.
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