Swr protection for 160m linear amplifier

[mosfet80]

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.

 

[pranam77]

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

 

[davenn]

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