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Many have walkie-talkies.Buy them can be in the store, however, such work often interfere with radios terrestrial obstacles.But you can self-assemble stationary radio with a small capacity and an extended-range.Consider how to make the radio with his own hands.This will require:
- Resistors - AC 47 ohms and 10 ohms
- transistor P416
- capacitor 0,022 mF (2 pcs.)
- Capacitors 4700 pF, 0.033 mF, 100 pF, 33 pF, 51 pF
- trimmer capacitor4-15 pF (2 pcs.)
- choke (L2) 20-60mkG
- telescopic antenna
- Carbon microphone
- copper wire cross-section of 0.5 mm (40 cm)
- battery (9-12)
- switch SA1
- piece Micarta
- power switch
- Textolite for mounting plate
- aluminum sheet
- Equipment wire
- Accessories for soldering
First, you need to make the chassis U-shaped aluminum sheet.It is necessary to position controls.This power supply unit must take a ready-made from the radio,
transceiver circuit coil has to be made of copper wire having a diameter of 1 mm.We need to take the bare wire, or even better - silvered.It is to be wound on a rod having a diameter of 12 mm.The coil should contain 4 turns with a tap in the middle.In this case an antenna coil placed over the loop coil and the coil contains 1-2 the same wire.Choke should be wound on the sun-resistance 0.25.They should contain a 0.5 m-0.15 PEL wires.Regarding
adjustment capacitor C, it can take a ceramic dielectric, however, it is better if it will have an air dielectric with a movable plate or with the two fixed plates.Transformer Tr1 should be taken from the TV or the receiver tube.It should be noted that the high resistance winding of the same transformer is used as Dr6 throttle.If you are thinking how to make a radio from the phone, and decided to apply the low-impedance speaker phone, you need to include them in the low-resistance winding of the transformer.Also note that if you want to use in the scheme of the phone as a walkie-talkie its use impossible.But it is necessary to take out the carbon microphone.As the switch "reception and transmission" is well suited wafer switches.
next stage - the creation and configuration of the antenna.Consider how to make the antenna for the radio.Thus, after the radio body is assembled, it is necessary to make the coil L1 for exactly 11 turns of wire is 0.5 mm thick.It uses a range of adjustment to the value of 27-30 MHz.If need accurate adjustment range, it is necessary to use at the data reception mode trim capacitors C1 and C2 - during transmission.Moreover, one should consider receive mode switch SA1.Adjust the range should be using a reference receiver factory production.You can simplify this task, taking the headphones, so the setting is much faster.
figure out how to make a radio, move on to the next stage - setting for the transmission mode.It is necessary to pre-set position of the switches to get the loud hiss of the speakers headphones.You need to get a constant stable signal used by the control transmitter.It is necessary to note that while you can not touch the coil L1.It is necessary to act in using the as-built capacitor C1.At concurrence of the carrier signal with a frequency setting supernova noise should disappear.During the switch to control the transmission of the radio must be clearly audible sound from the microphone.When the desired results are achieved, it will be necessary to move to the consolidation of special construction fasteners.
Fasten coupling coil and an antenna
Using a homemade antenna, kindly provide antenna power, because it is able to further increase the harm the device or simply spoil it.It should be noted that the position of the coil due to the antenna should be chosen so that when signal transmission power is a maximum, and reception - stable.Moreover, in can be configured to use as a pocket radio receiver and transmitter control.Scheme wavemeter to configure vibration transmitter and receiver circuits can be seen here:
It should be noted that a number of radio frequency bands in Russia is reserved for military use, so the work of amateur radio in the radio frequency range of data is prohibited.
Also, over time, can be carried out and some upgrades to your radio.For example, it is useful to set the battery and charger for it.It will be possible to add cooling radiators for transistors and make output for connecting an external microphone, headphones and an external antenna.With these additions, no shoplifting radio can not be compared to yours!