Diy Rf Power Meter

Average power and amplitude modulation index in line using a power tap or terminated metering.

Diy rf power meter. An diy rf decibel or power meter is an indispensable instrument in any radio workshop. The rf power in dbm can be read directly with a multimeter and i ve found it particularly useful for measuring rf filter response when combined with a sweep generator and an oscilloscope. The fsm we are going to make is a very simple one that we will use to detect the relative rf power being transmit. Pictures of a homebrew 2 4 ghz rf power meter swr meter.

Rf meter for multimeter. A power level of 1 to 2 w at 7 mhz is fine. Two rf attenuator versions have been presented below. 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.

Unfortunately accurate wideband models are fairly expensive and home constructed ones are generally not sufficiently sensitive and or are very temperature dependent. If the power output is 1 w the peak rf voltage will be 10 v. 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.

Rf voltmeter connected at the output of the transmitter no. Let s turn our ordinary digital multimeter into an rf field strength meter fsm. Hello scientists makers and people with free time. Power meter using a low power transmit ter.

Rf attenuator is a simple resistor divider that allows ad8307 rf power meter to measure higher rf power than 2w. Diy inline rf power vswr meter. It is even possible to use the directional coupler and detector diodes from an old cellular phone. Voltage reading is dependent upon load impedance at the point of measurement power meters on ameritron power amplifiers 2.

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. 20db rf attenuator increases measurment range up to 20w while 40db rf attenuator increases measurment range up to 50w. Rf power swr meter with average and peak. To determine power we need independent measurements of voltage and current 5 4 2012.

Wes hayward w7zoi and bob larkin w7pua simple rf power measurement qst june 2001 pages 38 43. The detector output will then be about 9.