3
West Mountain Radio
Operating Manual
Radio Frequency Interference Considerations
All electronic circuits are susceptible to EMI (electromagnetic)
and RFI (radio frequency) interference. However, it is a matter
of to the degree, that such interference may be suppressed.
In severe cases, no electronic circuit can be expected to
work properly. The COMspkr system is inexpensive, but
has been designed to provide more than adequate rejection
from interference when operated near any radio frequency
transmitter.
With any electronic equipment, it is good practice to coil any
excess wiring. This makes the wire less like a good antenna
and the coil of wire becomes a choke. It is also good practice
to keep wires from running parallel to a wire that has RF energy
on it. If two wires must be near each other, it is best to have
them cross at right angles. All of this is true for any electronic
installations.
It is recommended to use a resonant antenna that does not
radiate from the feed line to insure proper operation of electronic
equipment in a radio station. If these speakers are used near
a feed line that is radiating, they may not work properly. If a
non-resonant antenna that is matched with a tuner must be
used, locate these speakers and the wires as far as possible
from the feed line and antenna tuner. Be sure to properly tune
the tuner and have the station properly grounded to a single
point ground. If the station ground and AC wiring ground are
in different locations, and both connected to the transmitter,
there will be a dangerous ground loop that may also cause
EMI problems.
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