T8A: RF carrier; harmonics and unwanted signals; equipment and adjustments to help reduce interference to others


The emission types in order from the narrowest bandwidth to the widest bandwidth are:

The name for emissions produced by switching a transmitter's output on and off is CW.

The usual bandwidth of a single-sideband amateur signal is between 2 and 3 kHz.

The usual bandwidth of a frequency-modulated amateur signal is between 10 and 20 kHz.


The term that describes the process of combining an information signal with a radio signal is modulation. An RF carrier is a radio frequency signal that is modulated to produce a radiotelephone signal.
The result of over deviation in an FM transmitter is out-of-channel emissions.

Splatter interference is caused by the overmodulation of a transmitter.

The frequency of a harmonic as compared to the desired transmitting frequency is exactly two, or three, or more times the desired frequency.

If you change your transceiver's microphone from a mobile type to a base station type you should make an on-the-air radio check to ensure the quality of your signal. (to make sure you are not creating splatter interference or overdeviating.)


Good station grounding is needed when connecting your computer to your transceiver to receive high-frequency data signals since good grounding will minimize stray noise on the receiver.