* 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

Let us know of your plans for 2018 and we will promote them on this Forum

.

,
.
.

. ,

,

.Norwich MBC Weekend 28,29 July 2018
.Model Boat Convention, Haydock Park, 25,26th August
.

.Bluewater, Dartford, Chantry Model Boat Club, Sunday 2nd September

. Bournville MBC, Birmingham, Sunday 2nd September

,The Model Show,Poynton, Stockport (with swimming pool) 15,16th September 2018

.Barrow in Furness MBC, Sub Day and Regatta,Sunday 23rd September 2018. (DATE CHANGE!)

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 37 on Sun Mar 13, 2011 11:27 am

Latest topics

» KRICK UBOOT DIVING PROCESS
Mon Jul 16, 2018 8:29 pm by tsenecal

» small diameter static-diving type SubDriver
Sun Jul 15, 2018 11:30 am by merriman

» Receiver aerial
Wed Jul 11, 2018 3:34 am by cgbillb

» Pinger 2 - Ultrasonic
Sun Jul 08, 2018 2:45 pm by david f

» Anchors - Norman Ough drawing
Sun Jul 08, 2018 2:34 pm by david f

» Model Boats magazine, August 2018
Sun Jul 08, 2018 2:23 pm by david f

» U44. Tinplate Clockwork Diving Submarine Made from a cereal tin a sandbag and a hammer.
Wed Jul 04, 2018 2:44 pm by david f

» The John P Holland Centre, Co Clare, Ireland
Fri Jun 29, 2018 2:06 pm by david f

» PCB Desgins
Tue Jun 26, 2018 10:10 pm by timgarrod

Statistics

Our users have posted a total of 10588 messages in 1738 subjects

We have 774 registered users

The newest registered user is KSIMODO


    rf power meter for 433/458 Mhz

    Share
    avatar
    david f
    AMS Treasurer

    Posts : 1966
    Join date : 2010-11-10
    Age : 67
    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 Jul 21, 2018 9:01 am