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Automatic SWR meter and semi-automatic tuning unit


This circuit, very useful when tuning an antenna, placed behind any "TOS meter" allows the ROS to be displayed directly, without the need for end calibration
post 13 Mar 2024
Automatic SWR meter and semi-automatic tuning unit

Swr Meter Links

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Rosmetro con accoppiatore a due toroidi
Costituito dai due trasformatori T1 e T2 , ognuno con una spira sui primari, costituita da cavo cossiale, e da N spiresui secondari opportunamente collegati

Setting the SWR of Your Antenna
SWR standing wave ratio, is a measurement of how efficiently your antenna system will radiate the power available from your radio

Simple 2.4 GHz SWR Meter
A simple 2.4 GHz SWR meter which is based around surplus microwave hardware which can be easily found

Simple RF Power
The board shown here has two separate detector circuits on it, and is the one I now use for monitoring both forward and reverse power with a dual directional coupler, and for providing an SWR trip signal


Take off angle of horizontal antenna

Take off angle of horizontal antenna For horizontal polarization, the electric field will move sideways on a horizontal plane, while for vertical polarization it will oscillate up and down on a vertical plane

Build a Three-Way Antenna Switch and Display

Build a Three-Way Antenna Switch and Displa To use a wireless relay to select one of two high current capacity power relays

5 element yagi antenna for 28.5 Mhz

5 element yagi antenna for 28.5 Mhz Gamma match will be made with a 1/2 "aluminum tube and a 75 cm coaxial piece of RG8 without sock and sheath inside the tube