This scheme of the transmitter is designed to transmit on a radio channel AUDIO and VIDEO signals. Actually the microwave generator is taken ready VCO MURATA manufacturing (or similar) at frequency 1GHz. In it have something to change, to raise the frequency ( by Paiania parallel inductance customizados contour cut silvered(required) wires so that the frequency podnyalas ~1.3 GHz) with slope control needs to be ~25-40MHz/V, otherwise 'll have to put the amplifier :(
To the control input of the VIDEO served through a trimmer, which sets the depth of FM. There are "injected" signal from the subcarrier generator of the sound. The subcarrier generator configurable ( elements L1, C1) at the frequency of 6.5 MHz. The AUDIO level should be set such that the frequency deviation has not prevyshala 75kHz. Trimmer set the level of the subcarrier such that it does not affect image quality. the selection of resistors in the bases of the MIND making consumption currents: for the first stage ~8mA, for the second ~15mA and for third ~45mA.
The whole scheme is collected bilateral the installation on Board Hm.
If you have no opportunity to enjoy three-layer charge do as I did: use two boards on the PCB, d=0.5 mm with double-sided metallization size Hm. One side remains untouched (it will serve as a separating screen, and the second is the scheme. On the first Board DC/DC Converter (I used MAX1674), the microphone amplifier (two stages) and generator 6.5 MHz. For a second all the microwave part (don't forget to follow the rules for microwave installation, high land, short routes, etc.). The fees add up on-screen the sides and fastened with copper rivets.
The entire construction (i.e., Board, CMOS camera and the container under AA-element) has dimensions of 125 mm length 18.5 mm diameter.
A small detail: the start power the Board through the choke L=80-120nH, and the microwave signal from the output stage of the DWP is fed through a blocking capacitor to the metal body container food serving antenna.
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