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Swr protection for 160m linear amplifier

时间:04-08 整理:3721RD 点击:
Hello. I have a mosfet's linear amplifier for 160m and i am looking for swr protection.
Do you have any idea/circuit to add at output to protect my linear? Thank you very much.

Generally any swr bridge will show the FW and REF power. Google for "Hamradio projects" or SWR meter for ample projects on the subject.
Cheers

the usual method is to use a directional coupler on the output circuitry of the final stage of the transmitter/amp. the detected RF is converted to DC by an appropriate diode detector and that changing DC voltage with increasing reflected power levels can be used to control a transistor that will supply the transmitter with its main DC voltage.
It is normal to control the DC volts to a driver stage rather than the final stage.

as reflected power increases, DC supply to driver decreases = lower TX power out.
simplicity at its best :)


Dave
VK2TDN

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