Homemade transceiver circuit for ham radio
Transceiver circuits are different in complexity. There are simple ones that do not require scarce radio components. Properly assembled, it requires minimal adjustment at the end.
Chokes, of which there are four in the circuit, can be taken the same and ready. Suitable factory, for example, PDM. If you want to do them yourself, then use ferrite rings with outer and inner diameters, heights of 7, 4 and 2 mm, respectively. For winding, a wire with a cross section of 0.2 mm, enclosed in silk insulation, is suitable, and ordinary PEV is also possible. The number of turns is 30.
Four out of five transformers are also made on the same ferrite rings. The wire is used 0.12; it is folded twice or three times and wound 12 turns. The circuit for the fifth transformer is taken from a radio receiver (for example, Chinese). It is desirable in larger sizes. The wire is used the same, the number of turns on the windings is 4, 12.
Band-pass filters can be made by yourself, but the best are ready-made ones, for example, from the friendship transceiver. The telegraph opornik turns out worthy if you use the scheme that is available in the Myasnikov transceiver. It is a single board universal path.
The frequency synthesizer for the transceiver can be taken from any of the available in any electronic devices. You can, if you have the skills to make circuits, do it yourself, relying on a circuit selected from the Internet.
After preparation, they combine all the details into a single whole according to the existing scheme. A simple transceiver is obtained, in which there are nodes operating both in transmission and in reception.
The written scheme is not the only simple one. There are others - you can easily find them on the Internet. For more advanced craftsmen who are versed in radio engineering, it is better to use schemes more complicated and more reliable.