Diy Rf Power Meter

The below is based on a very popular power meter by wz7oi w7pua described by in qst in june 2001 ref.

Diy rf power meter.

The fsm we are going to make is a very simple one that we will use to detect the relative rf power being transmit. Unfortunately accurate wideband models are fairly expensive and home constructed ones are generally not sufficiently sensitive and or are very temperature dependent. Diy inline rf power vswr meter. Two rf attenuator versions have been presented below.

How should rf power be measured. Here is yet another ad8307 based rf power meter which adds an opamp to produce a dc output voltage of 1mv dbm e g 0mv 0dbm 10mv 10dbm etc. It is possible to make high frequency rf power swr standing wave ratio meters using homebrew directional couplers and other easily available parts. 2 4 ghz rf power meter swr meter.

Let s turn our ordinary digital multimeter into an rf field strength meter fsm. Wes hayward w7zoi and bob larkin w7pua simple rf power measurement qst june 2001 pages 38 43. Attach the transmitter through the tap to a dummy load where the output voltage can be read directly using a di ode detector and dvm as shown in fig ure 6. To determine power we need independent measurements of voltage and current 5 4 2012.

Rf power swr meter with average and peak. Voltage reading is dependent upon load impedance at the point of measurement power meters on ameritron power amplifiers 2. Rf voltmeter connected at the output of the transmitter no. A power level of 1 to 2 w at 7 mhz is fine.

Hello scientists makers and people with free time. Pictures of a homebrew 2 4 ghz rf power meter swr meter. The detector output will then be about 9. 20db rf attenuator increases measurment range up to 20w while 40db rf attenuator increases measurment range up to 50w.

It is even possible to use the directional coupler and detector diodes from an old cellular phone. Overall this is an accurate meter fantastic for a meter under 20 good performance across the hf bands using fairly common parts and simple construction techniques. If the power output is 1 w the peak rf voltage will be 10 v. An diy rf decibel or power meter is an indispensable instrument in any radio workshop.

Power meter using a low power transmit ter. Rf meter for multimeter.