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Engineering
Electrical Engineering
How Do Microwave transmitters work without physical connections?
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[QUOTE="davenn, post: 6053463, member: 283516"] not sure which parts you are specifically referring to ? but here is an annotated version of your pic that I have done that explains different parts [ATTACH=full]230424[/ATTACH]OK, the core of this transceiver is the DRO Dielectric Resonator Oscillator …. this directly generates the required 10GHz frequency. The RF out goes down that stripline to that surface mount component most likely a capacitor. Then it is split to the left to the Transmit Antenna and to the right to a mixer device … possibly a dual gate GaAs-FET To the right of the mixer is the Receive Antenna. The incoming signal from the RX Ant. is mixed with a small amount of RF from the DRO and produced an IF (Intermediate Frequency) that goes to the rest of the receiver circuit. So the DRO is providing BOTH the transmit signal as well as the LO ( Local Oscillator ) signal. You will note I have also arrowed a number of small stripline matching stubs … these are for impedance matching so as to get maximum power transfer along the line Those 2 little fan shaped circuit tracks to the left of the DRO puck are RF chokes DRO's are found in every satellite LNA that sits up at the focus of the satellite dish. Some LNA's have 2 DRO's in there when they need to operate dual band I have taken a Satellite LNA where the DRO is operating at around 11.3 GHz and have added/glued small lumps of ceramic to the top of the DRO puck to lower its frequency down into the amateur (ham) radio 10.3 to 10.5 GHz bandA typical DRO layout/circuit example …. [ATTACH=full]230425[/ATTACH]cheers Dave [/QUOTE]
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How Do Microwave transmitters work without physical connections?
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