The Association of Model Submariners.

Would you like to react to this message? Create an account in a few clicks or log in to continue.

* THE FORUM FOR ALL THOSE INTERESTED IN BUILDING AND OPERATING MODEL SUBMARINES *



Join the AMS - Registered Forum users can become members of the AMS and it's free ...... To join send an email with your name , address and phone number to amstreasure@googlemail.com


For a guide to past events see the "Shows and Events" section.

....

Bournville Dive-In, Birmingham, Sunday 4th Sept 2022

Who is online?

In total there are 3 users online :: 0 Registered, 0 Hidden and 3 Guests :: 1 Bot

None


Most users ever online was 180 on Tue Nov 05, 2019 6:03 am

Latest topics

»  Submarine weekend, Sheringham, Norfolk,30th and 31st of July 2022
rf power meter for 433/458 Mhz EmptyToday at 7:57 am by david f

» WW2 mini sub build
rf power meter for 433/458 Mhz EmptyYesterday at 10:43 pm by SimonH

» Papplewick Pumping Station 2022
rf power meter for 433/458 Mhz EmptySat May 21, 2022 9:39 am by david f

» Akula 1/144 scratch build
rf power meter for 433/458 Mhz EmptyThu May 19, 2022 7:51 am by redboat219

» Darnell U class wanted
rf power meter for 433/458 Mhz EmptySat May 14, 2022 8:19 am by david f

» New modeller looking for U-Class to build
rf power meter for 433/458 Mhz EmptyFri May 13, 2022 3:35 pm by Paul Reilly

» K class plans
rf power meter for 433/458 Mhz EmptyFri May 13, 2022 10:18 am by david f

» Radio ideas -27Mhz
rf power meter for 433/458 Mhz EmptyWed May 11, 2022 12:29 pm by david f

» 915mhz / 868mhz as a viable frequency for submarines.
rf power meter for 433/458 Mhz EmptySat May 07, 2022 10:16 pm by tsenecal

Statistics

Our users have posted a total of 11689 messages in 1922 subjects

We have 952 registered users

The newest registered user is Confused

    rf power meter for 433/458 Mhz

    david f
    david f
    AMS Treasurer


    Posts : 2249
    Join date : 2010-11-10
    Age : 71
    Location : Cumbria

    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 Mon May 23, 2022 9:10 pm