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*2021 AND SOME EVENTS ARE BEING PROPOSED. Keep them coming and let us know the details!

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(CANCELLED in 2020) Submarine, Boating & Sailing Weekend, Norwich MBC, Weekend of 25,26th July

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Bournville Sub Day. Sept 2021 is looking likely. More details TBA.

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Barrow in Furness Regatta and Sub day. Maybe in Sept 2021. Details TBA.

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» UHF radio control for submarines (openLRS, LoRa, FSK etc. on 458Mhz and 433Mhz )
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    rf power meter for 433/458 Mhz

    david f
    david f
    AMS Treasurer

    Posts : 2158
    Join date : 2010-11-10
    Age : 70
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    rf power meter for 433/458 Mhz Empty rf power meter for 433/458 Mhz

    Post  david f Sat Dec 30, 2017 11:29 am

    rf power meter for 433/458 Mhz 20160610


    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:

    ORDER TOTAL
    £13.98
    See description
    Order 100--2500MHz RF power meter logarithmic detection power detection HF UHF BoardView similar items
    View seller's other items
    More actions

    1 item sold by wishyou-happy
    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

      Current date/time is Sun May 09, 2021 4:43 am