In order for radio users to communicate with each other, their devices must be tuned to the same frequency. How this tuning is done depends on the design of the radios you are using.
Instructions
Step 1
First of all, make sure that the radios you are using are approved for use in the country where you live. In the Russian Federation, these are LPD stations with an output power of up to 0.01 watts and PMR with an output power of up to 0.5 watts. Recently (since November 2011), they have been supplemented by CBS standard radios with an output power of up to 10 watts. All these radios are easy enough to purchase, and you do not need to register them. Also in our country, you can use radio stations of the amateur bands, but only after a rather complicated procedure for obtaining a callsign and category.
Step 2
Before you tune a station to a particular frequency and operate on that frequency to transmit, make sure that this frequency is within the range in which it is allowed to operate. Stations with a fixed set of channels are usually designed in such a way that they simply cannot be tuned to an out-of-band frequency. But there are also exceptions. For example, some expensive CBS radios have some of the channels that cover the amateur 28 MHz band. It is prohibited to work on these channels for transmission without permits. If the station is an amateur, then it is usually rebuilt smoothly or in small steps, and the set of frequencies and powers in which you are allowed to work depends on the so-called category.
Step 3
This aspect is also important. If your station is a multi-band, and the antenna is designed only for a certain range, it is strongly not recommended to work on it for transmission in other bands, even if you have the right to do so. The radio can be damaged by the output stages of the transmitter.
Step 4
If the radio station has a smooth tuning along the band using the vernier, tune it to a frequency close to the one to which the other station is tuned. Let the owner convey something. At this time, while working on reception, tune your station more precisely according to the maximum signal (with amplitude modulation), no distortion (with frequency modulation) or natural sounding of the voice (with single sideband modulation). If you have a fine adjustment knob, be sure to use it as well.
Step 5
An analogue tuning station can be equipped with a so-called digital scale. If there is one, setting the operating frequency is greatly simplified: just get the indicator readings that correspond to this frequency. Equally convenient is the optical scale, which is almost as accurate as the digital one.
Step 6
Synthesizer stations usually allow this parameter to be entered in several ways. If you know the exact frequency, enter it directly using numbers from the keyboard. Or tune the station with the so-called knob - an electronic-mechanical emulator of the tuning knob. The frequency will be displayed on the screen.
Step 7
Tune a station with a fixed channel set using the arrow buttons. One of them decreases the channel number, the other increases. The instructions indicate which channel number corresponds to which frequency.
Step 8
If the station has a fixed tuning on one channel, communication between two such devices is possible only if these channels are the same. Some imported single-channel stations from the early nineties are designed to use replaceable quartz resonators. Be sure to turn off the walkie-talkie before changing them.
