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
Today at 12:54 am by stig58
» Cheap Arduino Auto leveler
Sat May 11, 2024 6:53 pm by 17b
» No reverse on Brushless ESC
Tue May 07, 2024 3:26 pm by geofrancis
» Peral Submarine of 1888
Mon May 06, 2024 11:16 am by david f
» Newbie needs advice!
Fri Apr 26, 2024 1:58 pm by david f
» Modulated electric fields for submarine communication in a "heads up" from Harry!
Sun Apr 21, 2024 6:09 am by geofrancis
» 868/915 Mhz as a viable frequency for submarines.
Wed Apr 10, 2024 5:48 am by tsenecal
» Laser cut Robbe U47 conversion
Tue Apr 09, 2024 3:40 pm by david f
» ExpressLRS - 868/915 Mhz equipment
Tue Apr 02, 2024 3:27 pm by tsenecal