Embedded Files
First prototype Power and SWR meter powered by Teensy 3.2 and ILI9341 TFT display made in 2017
PCB with holes to attach ferrite cores to.
Some tiny components from the power and SWR meter
Power and SWR meter, see also https://www.youtube.com/watch?v=RvDgRj9UjFI
RadioStuff group Power and SWR meter
All components mounted
Teensy mounted on bottom site of PCB
My newest version January 2019, 10mW - 1.6 kW, the used coupler is a Sontheimer/Frederik-Koppler.
The display is a Newhaven slimline Oled character 4 x 20 display powered by a Teensy 3.2 a modified display library is needed.
Calibrated at 0dBm and 23 dBm.
TFT or character 4 x 20 Oled display
Device under test....
The VNA plot tells something about the meter.
Test the meter......
My first meter ..... tested by Rohde & Schwarz (not calibrated)
Here I measure the ouput of my radioberry.
The newest board V2.1( 2020), 2 x AD8307, 1 x AD7991, Teensy4 and a connector for a RA8875 with GSL1680 or FT5206 touch controller.
Gold plated and double thick copper layer.
The CPU board meant for a external coupler
Slots for the side bars
The RA8875 fits perfectly into the pockets many cnc steps are needed
8 mm thick Alu, pocket depth at 6 mm
Holes for ETH, USB. 4 x sma, power switch, user I/O DB9, and 8- 30VDC supply.
Back panel work in progress
Smallest as possible....for a 5" RA8875 display
Dimensions w=150 mm, d=100 mm, h=90 mm
Home made cabinet for LJ-2000M and LJC-2K, front and back panel not anodized.
From scratch designed cabinet wide 150 mm, deep 100 mm, height 90 mm. Front and back panel 8 mm anodized aluminium,
cover fingerprint free 1.0mm stainless steel.
Check my new home build Power and SWR meter.....
Panels black anodized
Inputs reflected and forward power, USB host, Ethernet, 9DBm for swr alarm etc, supply input from 7 -36VDC
Earth strips for SO239 connectors
New coupler (LJC-2K) 10 mWatt - 2 kWatt in a Hammond 1590BS enclosure.
Top plate engraved at 0.1 mm and painted, a small engraving mistake text LJC-2K to close to the mounting hole.
Text engraved at 0.18 mm, with a spiral engraving bit 0.1mm 30 degrees.
CPU board connected to external coupler, testing setup
A new cabinet is needed for this project.....
5.8 mm thick aluminum frontpanel, pocket made for the slim line Oled NHD display at 5mm depth
Dual coupler Final version V2.3
New firmware was needed.
Graphical interface rewriten 2021
This is a 3.5" version with ILI9488 tft touchscreen display, running on a 70MHz SPI bus, front panel CNC made. Must be anodized in black soon...
Layout changed and is now same as the 5" - 7" version and some bug fixes, April 9th 2022
My Power and SWR meter have now a wireless add-on with a ESP32 webserver, programmed in HTML, JavaScript, CSS and C++ about 3 months design time, June 11, 2023.
New colorful layout gives a modern style to the Power and SWR meter, both meters a dual coupler versions measuring range 10 uW - 2000W accurate from 1 till 30 MHz within 0.2 dBm.
We can use 6 calibration sets for two couplers and well : HF, 6 meter, 2M and 70cm.
A small module is mounted with a ESP32 used as webserver to read out the meter everywhere via a web browser.
Updated powermeter, new buttons, keyboard and much more, with new firmware ready for webserver.
For store and restore your 8 calibration sets I made a program in Lazarus pascal.
WiFi web interface with ESP32, reading values and change bands, coupler and PEP values.
Now also with your call name, name can set via Power and SWR meter menu.
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