Tuning the antenna, or rather adjusting its standing wave ratio (SWR), is a fairly simple process, but without it, the walkie-talkie will not work in principle. To perform the adjustment, you need a special device - a SWR meter. They differ in frequency ranges and for a 27 MHz radio, you need a device that works with just such a frequency. Also, almost all SWR meters are capable of showing the real output power of the walkie-talkie, and usually the real watts differ significantly from those indicated by the manufacturer.
Instructions
Step 1
Connect the SWR meter to the gap between the radio and the antenna. Put the arrow on it at the "0" mark, turn on and press the transfer button on the tangent or the radio. The arrow will immediately falter and show the true SWR. The lower it is, the better. The ideal score is 1.1, 1.2, sometimes 1.3. If the rate is higher, your transmission will suffer. Therefore, it is necessary to look for the cause either in the wire, or in the antenna itself, or in the transmitter of the walkie-talkie.
Step 2
Configure the radio. It is produced on a specific mesh (usually mesh C). So, for example, if you work with channels 15 and 19, it is better to tune in the middle - at the time of tuning, the radio should be on channel 17. It should be remembered that after tuning the channel, moving the magnetic base even a small distance can knock down all SWR, so select a place in advance, knowing that the antenna will be installed there.
Step 3
Adjust the antenna. To do this, you just need to loosen the screws at its base and lower or raise the pin inside the coil or vice versa, respectively, out of it. Some types of antennas are adjusted by "biting off" the extra length of the rod. However, it should be borne in mind that if you lift the antenna rod up too much, it can be pulled out by the headwind while driving. Advice for those who buy an antenna - if the pin is sold separately from the coil, and the seller claims that it is tuned - nothing like that. The antenna must be tuned with your walkie-talkie and directly on your car.
Step 4
When purchasing, be sure to ask for the SWR setting. An un-tuned antenna can destroy the radio station during transmission, and in the best case, you will lose the output signal power during transmission. If the pin is already in the coil, then, most likely, the antenna is tuned to grid C.
