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tags: [radio, ham-study]
---

The term "calling CQ" means making contact with other amateur radio operators.
There is an established protocol for doing this. Below is the convention for 2m
communications (VHF):

1. Tune to the _calling frequency_ for the band. For VHF this is 145.500 MHz.
2. Check that the calling frequency is not currently in use.
3. If free, call for a specific call sign, or, for general contact call "CQ".
4. Once you have found someone, find _another_ free frequency (not the CQ
   frequency) and ask/check that it is not in use.
5. If it is free, return to the calling frequency and direct your contact to the
   new frequency.

> Each of the main frequencies on the band plan will specify a "center of
> activity". This is where to start listening of contacts for the frequency when
> establishing CQ.