* 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 register on the forum first then follow the forum link to our membership form which is on our website


For further details of any events shown here also see the "Shows and Events" section on the forum

Thanks for notification of events and keep 'em coming!

.

, Papplewick pumping station, Nottingham, 21,22 April
Bournville June 2nd 2019, 10am
.

. ,

,

Norwich MBC Submariners joint Model Boat weekend - 26/27th July
.
.Model Boat Convention (Exhibition), 24,25 August

.

. Bournville Dive-In (2) MBC, 15th September

,,,,

Barrow in Furness MBC regatta and submarine event, Sunday 22nd Sept 2019,10am

Who is online?

In total there is 0 user online :: 0 Registered, 0 Hidden and 0 Guests :: 1 Bot

None


Most users ever online was 37 on Sun Mar 13, 2011 11:27 am

Latest topics

Statistics

Our users have posted a total of 10783 messages in 1768 subjects

We have 797 registered users

The newest registered user is moorerob

    rf power meter for 433/458 Mhz

    Share
    david f
    david f
    AMS Treasurer

    Posts : 2014
    Join date : 2010-11-10
    Age : 68
    Location : Cumbria

    rf power meter for 433/458 Mhz

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




    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 Sat Feb 23, 2019 10:29 am