The article deals with the use of two-way radios of the permitted range PMR 446 MHz, their characteristics, and their features. Demonstrated typical samples of walkie-talkies. Answers to the most frequently asked questions are provided:
What is meant by PMR446?
What are the PMR frequencies?
What is the power of PMR radios?
What is a Table (grid) of frequencies?
Why is a frequency grid required? Why can’t frequencies be used directly?
How to use the frequency table?
What are CTCSS and DCS encodings and what is it used for?
Are the PMR446 radios compatible with other civilian radios (CB radio)?
What is the typical range of walkie-talkies in the 433 MHz LPD or 446 MHz PMR band?
How can I increase the communication range in the LPD 433 MHz or PMR 446 MHz band?
Do walkie-talkies LPD 433 MHz and PMR 446 MHz work indoors?
Is it better to be indoors or outdoors to achieve maximum communication range?
Why can I read (listen to) others, but no one hears me?
Can PMR 446 MHz walkie-talkies be used as a base (dispatch, control room) radio?
Where can I buy high-quality and inexpensive walkie-talkies in the PMR446 range?
This article provides an overview of an inexpensive, simple and practical CB radio communication transceiver for installation in a car or truck to communicate with fellow travelers, work colleagues or hobbyist radio enthusiasts.
From the previous article, we know that the CB radio is the most affordable way of operational communication for personal, family, professional and other applications. Now we will look at one of the most interesting budget transceivers for installation in a car.
This article provides an overview of an inexpensive, simple, and practical CB radio kit for installation in a car or truck to communicate with fellow travelers, work colleagues, or hobbyist radio enthusiasts.
From the previous article, we know that the CB radio is the most affordable way of operational real-time communication for personal, family, professional, and other applications. Here we will look at one of the most popular kits for installation in a car, consisting of a two-way radio (transceiver) and a magnetic antenna.
CB (“Citizens Band”) radio is a section of the 27 MHz band, open for free use by anyone. In some countries, you still need to purchase a license for radio communications, but it is very simple and inexpensive. In any case, the CB mobile transceivers and walkie-talkie are the most affordable way to quickly communicate for personal, family, professional and other uses.
If we are talking about CB radio communication in the range of 27 MHz (Citizen Band), you can buy the most expensive radio and the most efficient antenna, but the practical work of this kit will depend on the correct and optimal installation in the car.
The power supply of the radio must be connected respecting mandatory compliance with polarity (usually the red wire – “+”, black – “-“). If the voltage exceeds 15V, the power supply to the radio should pass through the LINEAR converter. A pulse converter can be a source of interference and interfere with reception even if it is not connected to the radio. It is recommended to power [+] wire from the battery through a separate fuse and [-] wire – from the ground of the machine near the place of installation of the radio. If the [-] wire run from the battery, it must also be protected by its own fuse. The nominal value of the fuses must correspond to the design current of the radio. The radio must be placed in a convenient and accessible place, and the speaker must be open. The radio and antennas require periodic inspections and maintenance, so you need to install them so you can quickly remove them.
The antenna must match the radio frequency. If the antenna is installed higher and near the center of the machine, it works better (see diagram). Please note that installing any antenna in a bad place can result in a loss of more than 3 decibels of gain, which is equivalent to losing half the total power radiated by the radio transmitter. The antenna must be installed vertically. There should be no metal parts near the pin (whip). Mortise antenna designed for installation on a metal surface. If it is mounted on a bracket, it is necessary to ensure the contact of the antenna base with the ground of the machine: clean the paint on the antenna joints with the bracket and the bracket with the bodywork, and tighten the screws. Otherwise, the antenna will malfunction. If the antenna is good, properly installed, but does not work well for transmission, it may not be tuned by SWR on a specific channel. Verify, configure. If the metal surface of the installation has an insufficient area for the antenna or an irregular shape, tuning and proper functioning of the antenna may be impossible. Any damage, even minimal, to the antenna cable can break the connection and cause the radio to fail. The antenna’s threaded connections require periodic cleaning and the hidden cavities require drying.
It is normal to face spots with abnormal noise levels (for example, near the electric wires, office buildings (which have a lot of computers), etc. But if the noise level during the reception is too high everywhere, you should find and eliminate the source of interference within the car (it can be a pulse DC/DC or DC/AC converter, a led lamp, abnormal xenon, etc.)
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