rf power meter for 433/458 Mhz

These notes refer back to the antenna experiments I was doing a year or so ago. (See the main thread on openLRS for the details.

It turned out that the commercial/as supplied aerials actually work rather well and provide the best trade-off between performance and ease of use. Yagi aerials don't fit well  inside a submarine!

An RF power meter was a useful tool to measure relative power. Tim S has given details for a commercial meter on the main openLRS thread but I looked around for a cheaper alternative. And here one is - Thank you eBay!

The board is connected to a rubber ducky aerial and a 12v supply. I connected the output to a Digital Voltmeter on a 2v range. Very little soldering required.

The unit puts out 0.5v which rises to 0.6 to 0.7 volts on a signal. It seems to work well/repeatedly and avoids having to wander around town looking at your transmitter!

Some details:

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100--2500MHz RF power meter logarithmic detection power detection HF UHF Board
100--2500MHz RF power meter logarithmic detection power detection HF UHF Board
( 331792564238 )
   Features:

   can measure 88-108,300,433,915,2400MHz , etc. Frequency
   Supply voltage: 6-15V

   Operating Current: 15mA

   Working Impedance: 50 ohms

   Input frequency: 100-2500MHz (Extended mode can be used 10-3500MHz)

   Input power: -70dBm ~ 0dBm (up to 70dB dynamic range)

   Output slope: 18mV / dB