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*STOP PRESS* Coronavirus. A lot of Clubs have already cancelled all activities. Check carefully before you plan any travel

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CANCELLED because of coronavirus. Papplewick Pumping Station, Nottingham, Sunday 12th & Monday 13th April
CANCELLED because of coronavirus. Bournville Sub Day, Sunday 10th May 2020

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

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Model Boat Convention, Haydock Park (Cancelled this year)

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CANCELLED. Bournville Sub Day, Sunday 13th September

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(CANCELLED) Club Submarine Regatta, Furness MBC, Barrow in Furness, Sunday 20th Sept 2020

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Latest topics

» openLRS and 2.4 Ghz and Submarines
rf power meter for 433/458 Mhz EmptyYesterday at 9:52 am by david f

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rf power meter for 433/458 Mhz EmptySat Sep 12, 2020 10:30 am by david f

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rf power meter for 433/458 Mhz EmptySat Sep 05, 2020 10:31 am by david f

» Simple telemetry system for openLRS (on 458Mhz)
rf power meter for 433/458 Mhz EmptySat Aug 29, 2020 1:53 pm by david f

» John Lambert Plans
rf power meter for 433/458 Mhz EmptyThu Aug 13, 2020 11:51 am by david f

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rf power meter for 433/458 Mhz EmptyThu Aug 06, 2020 9:17 am by david f

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rf power meter for 433/458 Mhz EmptyTue Jul 28, 2020 8:02 am by Deep Diver (Fred)

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rf power meter for 433/458 Mhz EmptySat Jul 11, 2020 9:34 pm by timgarrod

» PIC and Arduino microprocessors
rf power meter for 433/458 Mhz EmptyThu Jul 09, 2020 10:59 pm by timgarrod

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    rf power meter for 433/458 Mhz

    david f
    david f
    AMS Treasurer

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    rf power meter for 433/458 Mhz Empty rf power meter for 433/458 Mhz

    Post  david f on 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
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    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 Wed Sep 23, 2020 12:12 am