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Lora Sensors

Sensor Network

Have been looking at deploying a sensor network for a while now.

Live on land here. My desire is to deploy basic sensors around the block reporting conditions (temp, humidity..) and also to activate relays (water system) or actuators (chicken house door). They will need to be watertight and low power. This is not a surveillance network. Its a sensor network spread across 4ha. The sensors will be distributed across the area with 200m being the longest path.

I have looked at deploying sensors using wireless or Bluetooth but neither were suitable. Either would work but range limited and high power requirements.

Whilst reading Glenn VK3YY’s blog describing LoRa tracker I recognised the opportunity LoRa presented.

LoRa stands for Long Range. This is a wireless Radio frequency technology introduced by a company called Semtech. This technology can be used to transmit bi-directional information to long distance without consuming much power. This is designed for remote sensors which have to transmit its data by just operating on a small battery. The LoRaWAN® specification is for a Low Power, Wide Area (LPWA) networking protocol designed to wireless connect battery operated ‘things’ to the internet in regional, national or global networks, and targets key Internet of Things (IoT) requirements such as bi-directional communication, end-to-end security, mobility and localization services.

Intend to use the (433MHz) LoRa transceiver modules based on SX1268 chips from Semtech Corporation and LoRa protocol for the network layer of my sensor network.

Use of 433MHz is legal to use in Australia without any form of licensing up to 25mW. Also included on Amateur 70cm band 420 – 450 MHz. Primary Service is  ‘RADIOLOCATION’ with Amateur as Secondary.

Difference between LoRa and LoRaWAN

  • LoRa is the modulation technique used in the physical layer of LoRaWAN network. It is basically CSS (Chirp Spread Spectrum) modulation used to provide different data rates using different spreading factors.
    • The basic principle is that information is encoded using chirp (a gradual increase or decrease in the frequency of the carrier wave over time).
    • Before sending a message, the LoRa transmitter will send out a chirp signal to check that the band is free to send the message.
    • Once the LoRa receiver has picked up the preamble chirp from the transmitter, the end of the preamble is signalled by the reverse chirp, which tells the LoRa transmitter that is it clear to begin transmission.
  • LoRa contains only the link layer protocol.
  • LoRaWAN includes the network layer RF, PHY, MAC and Application layer.
Lora the protocol will send what you tell it to. I will be using it to send information between the sensors and gateway (P2P communications) then the gateway will use HTTP over IP (WiFi) to send to application server.

High level view

Here is my proposed private IOT network.

Iot 12022020

Sensors, actuators, gateways and servers.

The network will consists of sensors, actuators, gateways and servers.

1. Sensors:

  • Sensors capture and transmit data to gateways over distances near and far, indoor and outdoor, with minimal power requirement.
  • Sensors will be based on Arduino devices
  • Sensors can be based on ESP32 devices.
  • End-nodes, or sensor devices will use LoRa Modulation (LoRa Technology) as the physical (PHY) silicon layer to create the long-range communication links
  • There is a wide range of input options
    • BME280 – temperature, humidity and atmospheric pressure sensor.
    • CC811 – CO2 and TVOC (total volatile organic compounds) sensor.
    • SDS011 – Dust sensor (particulate matter – PM 2.5 and PM 10).
    • MQ135 – Gas sensor. Has high sensitivity to Ammonia, Sulfide and Benze steam, also sensitive to smoke and other harmful gases.
    • AS3935 – Franklin lightning sensor (voltage divider)
    • https://create.arduino.cc/projecthub/projects/tags/sensor …..
  • Output will be relays or actuators depending on use. A relay can switch a water Solenoid whilst an actuator could close a chicken house door.

2. LoRa Gateway:

  • Gateways send information via Wi-Fi to devices on the TCP/IP Ethernet network.
  • Gateways will receive and send LoRa Technology
  • Arduino compatible device.

3. Application Servers & Cloud IoT Services:

Applications interpret the data collected by LoRa devices. Not sending into Cloud Services initially. Will send APRS WX from external sensors once sorted.

The application server in this case will be a device salvaged from a dumpster running Linux hosting a MySQL database displaying the information via Apache (LAMP Stack).

Devices

The sensor nodes will be based on Arduino,ESP32 and ASR605x (ASR6501, ASR6502) controllers.

Use LoRa Ra-02 module SX1278 (433Mhz) modules where not incorporated.
Use Audrino IDE for sketch development and uploading
FirstSketch bb

NewImage

The LoRa gateway will be based on Heltec micro controller.

This device is supported by Arduino GUI and has onboard OLED, WFIF and LoRa. There is also battery management abilities.

  • WiFi LoRa 32 (V2) from Heltec Automation
    • Microcontroller  ESP32 @ 240MHz
    • WiFi                  WIFI802.11 b/g/n/e/i
    • LoRa chip         SX1278
    • Bluetooth          BLE
    • Flash                8MB
    • RAM                 320KB
    • Display             0.96 inch 128*64 OLED

Highlights;

  • Fully supported by Arduino IDE
  • Lithium: Battery socket for Heltec boards is SH1.25-2 (JST 2P-1.25 (JST connector with 2 pins, separated each other by 1.25mm)
  • Vext 3.3V(500mA) output, for external devices (e.g. sensors) power supply, in deep sleep mode, Vext can be shut down via software
  • $30AUD delivered

Anyway so off I went.

Ordered some BME280 sensors and a couple of the CubeCell dev boards. The intent is to deploy outside. This setup will be able to run off a 18650 3.7V 1200mAH lithium polymer Battery.

Started to program with the devices and sensors I have here. Had all-ready ordered a WiFi LoRa 32. The built in Display, WiFI and Lora interfaces  for $20 was too hard to pass.

This data is not going to any cloud IoT services. Ultimately will expand to exploit select IOT cloud services but intent is to keep it internal.

I’ve used JSON ‘encoding’ for data being sent. There are a lot of reasons not to use JSON. Im using JSON to support device IDs.

LoRaWAN provides headers that support device identification. Had a go at Cayenne Low Power Payload (Cayenne LPP) encoding. Worked as described in the tutorials. It is used as payload for the TTN so a lot of material around. For now I did not want the overhead of LoRaWAN just for device ID so using JSON for the payload and adding own device control. Yes JSON is fat. Same data is 21 bytes using Cayenne whilst JSON comes in at 65 bytes.

When it comes time to send to IoT services it will be straight forward to pass the JSON to Cayenne then to via LoRaWAN to said service.

The use of JSON is also consistent with conditions of the Amateur licence. Not encrypted, clear text. No privacy concerns with clear text out here. Remote private network broadcasting current conditions in clear text. Dare say of little interest to Mr Potato Head.

Typical Data Packet;

 data={“id”:2,”t”:21.6,”h”:71,”b”:1007.5,”d”:0,”gps”:[-37.691,144.009]}

Also the size of the JSON data in bytes for the JSON string and RSSI from the gateways point of view are sent.

Decided not to use the Heltac library, not because it was not enticing but wanted to ensure compatibility across wider devices so open libraries used. Used the LoRa library from Sandeep Mistry. The Heltec library is identical

HTTP GET to PHP script on Centos server. Not happy with using GET. Again based on the Heltec examples as it worked.

PHP used for the script on the LAMP server to store the data in a MYSQL database.  Based on existing routines and works well. No presentation layer. Just working routines for now.

So currently (8 Mar 2020) Two sensors are sending data.

Here are the contents of two tables;

NewImage

So the basic functionality is present however, the gateway hangs after a couple of hours use. Suspect I have a buffer over run. Currently checking code as suspect its my error. I have Mega 2650 Mini available so will order another couple of SX1278 boards and create a gateway to see if its a hardware issue

I’ll go into detail of each step and link pages here;

So, more to come but initial efforts demonstrate a sensor network using Arduino and LoRa is more that achievable.
 
Allen
 

Libraries

Of Interest;

Notes:

Opportunistic Hardware Acquisition

or dumpster diving for computers.

I’ve noticed a trend. At the end of university terms the skip bins around student accommodation fill up with fridges, lounges and computers.

I’m putting this down to the the high cost for freight and low cost of technology.

Its not like I don’t have enough computers. In the shed there is an Apple IIe Clone, varies 8080 -> Pentium based devices (IBM XT & AT339)  and collection of RISC (ultra 2, SS2,10 & 20, HP and a dual CPU DEC Alpha) devices.

They all worked before being put away. Doubt they would boot up without addressing NVRAM issues and the odd wasp nest but they are going nowhere. Well that’s debatable as whilst the cases and boards may stay in my shed their souls will be reward in Silicon Heaven.

I use a Apple Mac for my desktop (the 27’ 5K iMac screen soothes old eyes) and for my personal notebook. There is a Dell notebook with Windows XP and a serial port for programming radios and everything else runs Linux. 

I rarely purchase new. The Macs come from Apple refurbished site and if I need components, eBay is the first port of call. Anyway I have recently acquired two computers by not being too ashamed to jump into a skip bin.

NewImage

i5 Workstation

MSI 7688v1.0(G52-76881X1)(P55A Fuzion). i5 CPU 760  @ 2.80GHz with 8GB memory.

Walking home down Collins St noticed a skip bin with the results of an office refurb. Hidden between the discarded partitions and lighting there were several computers cases, LCD screens and a printer. Seriously ? computers are considered office waste now ? Ok going in….

I was not alone and had to act fast. These computers had attracted the attention of another ‘recycler’ and we worked together. He took two boxes and a screen whilst I only grabbed a single box, did retrieved memory from one of the other boxes and just made it to the train heading home.

Knew it was a intel based device due to the sticker on the fan and assuming later then a Pentium based device as no ‘Intel inside stickers’. It was a long ride home wondering if I was bringing someone else’s rubbish home or had hit silicon jackpot. Michele is very tolerant but we don’t need another ancient device in the shed. Got home and ran it up to setup as no HDD. The case was low end and missing feet but did have a power supply. Also has a NVIDIA GT216 PCI-E video. The mother board supports Multi-GPU Computing. Ok that sounds cool so lets get another card tomorrow. Went back to the skip bin on the way to work on the next day armed with screwdrivers and pliers to retrieve more memory and a second video card but there was only had plaster and cables left. Too late.

Sourced a tower case and HDD. Installed Linux Fedora 29 and configured as a LAMP box so now it is hosting test instance of the ParksnPeaks website. This use to be hosted on the HP8100 but ran out of space and unable to add another drive.

NewImage

The HP 8100 was sourced second hand from eBay. It has a 2TB drive and runs Ubuntu 16.04.5 LTS hosting AppleTalk as it is the backup target for our Macs. The idea here is to pick it up one computer when leaving for fires so whilst you may loose hardware, will have data.

Dual Xeon Server

Intel® S5500BC Server. Dual Xeon(R) CPU E5506  @ 2.13GHz with 16GB memory.

Walking back from lunch recently I noticed a tower sitting next to a skip bin. It had empty slots where HDD carriers had been removed. You could see two heatsinks. This device caught my interest but I had to leave it as the case was too big to take back to work. I was receiving enough ribbing from by lunch buddies all-ready so stashed the case behind the bin to and took the ribbing whilst walking back to office. 

So once back at the office and out of sight of my ‘friends’  I grabbed a Phillips head and went back to see what was under the heat sinks.  Took off the heatsink and rubbed back the compound to find an Intel Xeon processor. Half the memory banks were filled. There where no hard disks nor a power supply so decided to take the board leaving the case in the bin.

NewImage

Got a case out of the shed and ran her up. She booted to setup no issues. I took a photo and sent to those who doubted it just to prove I’m not just a nutter, but a nutter with a dual Xeon server. Added a HDD and installed CentOS Linux. Setup up a search for ECC memory and picked up additional 16G from the US for $77 delivered. Now all the memory slots are filled, just need a decent case. The device is a SSI CEB form factor – 305 X 276mm slightly larger than a ATX 305 X 244 mm so a slight challenge as don’t want to buy (or pay for) a server case. Here she is running. Notice doing nothing.

JupiterLoad

NewImage

So what am I going to do with them ?

None of the devices are doing any real work. Need a box for testing and backup.

The inner accountant says should do nothing and keep using the HP8100 as backup and dev box. It requires no new hardware and uses the least energy.

The inner geek says not to listen to that idiot. If he had his way you would have been eating lunch at your desk not enjoying luksa and there would be a dual xeon server in land fill now.  

So have got my eye on a case for the Xeon. Will add a couple of drives for backup target and use it as the dev / test box going forward.

Want to add some devices outside for sensors and to automate garden activities. Glenn VK3YY raised the opportunities LoRaWAN present so intend to work out how to build a mesh of small devices reporting to the server using 70cm band. Will need a device to host a database and process all the data that will be generated and this would be a honourable task for such a device.

20082019 – K3NG Keyer

K3NG CW Keyer using the K5BCQ Board

Open source Arduino CW keyer

The board supports most but not all options available in the software. You can populate for the features you want or build in stages testing as you go.

High quality board visit K5BCQ to order a PCB  – https://www.qsl.net/k5bcq/Kits/Kits.html

NewImageI intend to install all options and headers where possible.

Already had a Mega 2560. The wrong type for this board.

WrongMega

You can see the differences here. The unit above will not match the board as it has additional pins to the top left (fro ground) and missing connections for references and reset bottom left.

NewImage

You could jumper around these but I jut ordered an new unit. Info – https://robotdyn.com/mega-2560-pro-embed-ch340g-atmega2560-16au.html

Keypad.

I sourced a 3X4 keypad. This keypad has 12 buttons, arranged in a 3X4 grid. It’s made of a thin, flexible membrane material with an adhesive backing

This only needs 7 pins (3-columns and 4-rows) whilst the board has 8 pins to support 3X4 or 4X4.

NewImage 

The difference between a 3X4 or 4X4 is the number of columns.  The PCB has 8 connectors so as to support both types. I will be using 7 but will install a 8 pin header so as to keep options open later. Info – http://www.circuitbasics.com/how-to-set-up-a-keypad-on-an-arduino/

Obtained a PS2 keyboard as a result of a site clean up at work. Put the word out to keep eyes open for one. After sending photos of a PS2 connector as considered ancient these days. 

P8160285

 

P8160289

These points are in the excellent instructions but to be sure,

Uncomment  #define HARDWARE_K5BCQ in keyer_hardware.h

  • keyer_features_and_options_k5bcq.h
  • keyer_settings_k5bcq.h
  • keyer_pin_settings_k5bcq.h

Note serial speed = 115200 defined in keyer_settings.h 

Compiled the software and loaded;

  • Sketch uses 57844 bytes (22%) of program storage space. Maximum is 253952 bytes.  
  • Global variables use 2324 bytes (28%) of dynamic memory, leaving 5868 bytes for local variables. Maximum is 8192 bytes.

Heaps of memory spare so believe they are using a MEGA 2560 due to the 54 digital I/O pins. 

Had failures with uploading the software as the Micro-USB connector cable I used only supported power. A quick look in the hardware bin at work secured a suitable cable off phone headset and away it went.  

So as it stands the board is up and running. Time to start playing with the device whilst considering options as to packaging.

Docs

K3NG Arduino CW Keyer Software – https://github.com/k3ng/k3ng_cw_keyer)

The K5BCQ PCB  – https://www.qsl.net/k5bcq/Kits/Kits.html

The W0ODJ documentation – https://github.com/muurtikaar/k3ngKeyer-K5bcqPCB-w0odjDoc/blob/master/doc/k5bcq_k3ng-V03.pdf

The softwares wiki – https://github.com/k3ng/k3ng_cw_keyer/wiki

07072019 – ATS4b Build

ATS4b

Recently acquired a unbuilt ATS4b kit.

Finished

This is a miniature 5 band CW radio. A KD1JV kit. It is small, lightweight, and fairly rugged HF QRP Radio. It uses very little current on receive and is efficient on transmit.

Features;

  • 80, 40, 30, 20 and 15/17 meter operation
  • LCD display with back lighting
  • DDS VFO for wide tuning range with crystal stability, 50 Hz tuning steps.
  • Single step or auto increment tuning
  • Sensitive, 0.2 uV receiver with very low internal noise for exceptional S/N ratio.
  • Selective CW filter with 4 crystal IF filter and audio band pass filter
  • 7 to 12 volt supply supporting;
    • 4.5 to 5 Watt transmitter output on all bands (with 12 volt supply)
    • 2.5 watts output typical with 9 volt supply
  • 50 ma no signal receive current
  • 680 ma maximum transmit current at 12 volts
  • Small size, 12.5cm wide, 6.8cm deep, 2.5cm tall
  • Light weight, 178G.

This is a SOTA radio.

This kit was released 2011 so lucky to get my hands on one (Thanks Tyler and Bill). You can purchase an assembled similar radio being a LNR MTR4B (80,40,30 & 20) at 400US$ + freight. Given the declining AUD (thanks mining why does the need for foreign owned enities to profit override my desire to play radio ?)  it really has not been high on my list to purchase one. I jumped at the kit. This device supports 80m.

Have a mate in the US (Thanks Jason) and he was happy to receive and send on to me so ended up landing here at around $400AUD inc freight.

This is a part of the quest to reduct weight so as to pickup some of the more challenging summits. Whilst are not a long walk they will be a big effort given the terrain and conditions. This device will keep the radio and antenna equipment well under 1Kg and support 5 bands be it CW only.

Reluctant to go out without 80m. For the chasers as much as to ensure enough contacts to qualify. Not having issues getting CW contacts these days.

Had spent the morning soldering copper tubing for fire sprinkler system. This is using the gas torch, liquid flux and 3mm solder. The afternoon was to be different. Once it started to rain (the geese were happy) I decided to come in and get out of the mud and cook up a radio.

StartDayOne

This kit contains SMD components. Previous build of SMD based device was a KD1JV MTR v2. This went well with the only real issue being as a result of losing a component and replacing with the wrong type.During the build, you have to choose between 17m or 15m. I will go for 15m.

Day One

Having read the manual and check the parts it was time to start assembly. This is not a task to rush into but rather progress in an orderly manner.

First step is to add the IC’s. Decided to hand solder these as a single task as the idea of placing all the semiconductors, capacitors and resistors then melting the solder in one sitting did not sound like a good idea.

At end of day one I had the IC’s on ready to inspect. Completed page 15 of the manual.

EndDayOne

Day Two. Testing the rework device.

Was not filled with desire to start heating up the board yesterday. Decided to verify the hot air soldering process before going forward. Using Solder Paste from Jaycar which has the Chemtools ID on it. Found the spec sheet on Chemtools website.

Yes using leaded solder. Have had trouble with using unleaded solder and think by now I have enough lead in my system given the paint used when a kid and the years of soldering not to get too worried about it.

SolderPasteSpecs

Didn’t trust the 852d+ soldering rework station so checked the temp and tested with an old board from the shed. Yes the display was out so experimented until in the range and able to take caps off the S3 board and solder them back on in a timely manner. All good.

ReworkDevice

So think I’ve procrastinated enough so time to commit to melting solder, tomorrow caps ….

Day Three. Check and Check again.

Zoomed in on some components with a 2MP USB microscope from eBay checking.

Upgraded the lights above the table but basically my eyes are not what they use to be so need such a tool. Not the absolute answer but these microscopes are worth the $A30.

CloseUp 001

Mixed results. The microscope stand had to be extended to get a good view. It did expose issues (surprising number of joints that were missed) and they were addressed. Once checked and addressed went back with magnifying glass and checked again. If this was left it would manifest as failure in the field so keen to fix now.

Day Four. Capacitors Bottom Side.

Image 005

Capacitors went on well. So will check the board again to be sure.

Day Five. Through Hole Components.

Not consecutive process as well work and we went Wuthering Saturday. Checkout the video, thats us in the red to the left !

The SMD parts went well. Very happy with the result. Working through the through hole components now.

Wet and windy weekend to was able to continue work on assembly Sunday. I have been following the instructions carefully as aware may not get such a kit again and that components may not be available should I loose or break some.

Adding the Low Pass filters (Page 20 in the assembly manual), which states that “These all go onto the Bottom Side of the board” whilst the picture on same page shows C73,C74 and C75 mounted from the top. I soldered C74 was per the instructions and whilst checking noted the discrepancy created by the picture. Removed C74 and placed in on the top of the board as per the picture. This caused conflict in my head and went checking out pictures on the web and which show them mounted on the the bottom.

See no reason to tempt fate de-soldering and moving C74 again so leaving as is on the top. Also have enlarged the hole to support a BNC connector for the antenna. Files the hole so it was slightly higher so as avoid the board. As you can from a dry run it will fit without causing grief.

EndDayFive

Working through the toroids now, again carefully and without time constrains.

Day Six. Final Assembly.

Well actually 10 days in total but have to go to work and other things….

After winding and installing the toroids its a case of assembling the hardware and connectors.

She did not come up on the first test and this was quickly traced back to a faulty 9V battery connection. Found another in my sons junk box and away it went.

From here it worked as described. The DDS came up on 10Mhz exactly.

Outputting 2w on the 40 – 15M 9V with 80M around half that. I took note of the torrid winding (loose for even and tight for odd) but there is not a lot of room to move for L12 & L14.

Connected to the home antenna and turned the receive to peak noise.

P7160244P7160246FirstTestJPG

The unit is operating so ready to take out onto a summit.

I see no value in disassembling and trying to refine the windings on 80M. Ok yes did chase this device for 80M but its a fall back frequency. Let’s get out on a summit and see how it works before playing with the number of turns.

QRPLabs QCX 5W CW single band transceiver

QRPLabs QCX 5W CW Single band transceiver

Another Arduino basd project, well not quite. The Arduino Uno is a microcontroller board based on the ATmega328P. This kit from QRPLabs also uses the ATmega328P. The software is not open source. Updates are provided as hex files.

This kit is extremely well documented. It is worth buying and assembling just for the documentation.

The assembly instructions are very clear and contain operation theory and alignment process.

Once assembled the device would not start. According to the excellent troubleshooting doc the processor had not been reset.

I had performed the modification for reliable microcontroller startup (repurposing inductor L5) during assembly so turned to the troubleshooting manual for direction. First was to go back and  check components then touched up the soldering around the processor and crystal and she started Ok.

QCXBuild

Next was to follow the assembly manual and align / tune then update the firmware. Again wth the excellent instructions there were no issue here.

Update Firmware from Mac;

I’m going to update the firmware from Mac using avrdude.

Purchased a USBAsp AVR programmer locally. It has a 10pin connector so get a 10 to 6 to match the ISP interface on the QCX or use dupont connectors like I did.

There are instructions on the QRPLabs site for win process for using  but No I want to use my Mac. Again Google is your friend. Given allready have XCode installed, I decided to just install avrdude and use the command line.

Install avrdude on Mac OSX.

Process is straight forward.

Open a terminal session and install Homebrew;

ruby -e “$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)” < /dev/null 2> /dev/null

Then install avrdude;

brew install avrdude

So the software is installed.

First Plug in the USBASP and verify the computer can see it (About->System Report) then check avrdude can see the QCX;

Allens-Air:QRPLabs allen$ avrdude -c usbasp -p atmega328p
avrdude: warning: cannot set sck period. please check for usbasp firmware update.avrdude: AVR device initialized and ready to accept instructions
Reading | ################################################## | 100% 0.00s
avrdude: Device signature = 0x1e950f (probably m328p)
avrdude: safemode: Fuses OK (E:FC, H:D1, L:F7)
avrdude done.  Thank you.

Noting the warning message. A quick Google revealed this is not an issue and there is a parameter you can pass to avrdude to skip skip the check so not worried, Ok then lets flash the device;

Allens-Air:QRPLabs allen$ avrdude  -c usbasp -p ATmega328P -U flash:w:T1.00f.hex
avrdude: warning: cannot set sck period. please check for usbasp firmware update.avrdude: AVR device initialized and ready to accept instructions
Reading | ################################################## | 100% 0.00s
avrdude: Device signature = 0x1e950f (probably m328p)avrdude: NOTE: “flash” memory has been specified, an erase cycle will be performed         To disable this feature, specify the -D option.avrdude: erasing chipavrdude: warning: cannot set sck period. please check for usbasp firmware update.avrdude: reading input file “T1.00f.hex”avrdude: input file T1.00f.hex auto detected as Intel Hexavrdude: writing flash (32076 bytes):
Writing | ################################################## | 100% 21.78s
avrdude: 32076 bytes of flash writtenavrdude: verifying flash memory against T1.00f.hex:avrdude: load data flash data from input file T1.00f.hex:avrdude: input file T1.00f.hex auto detected as Intel Hexavrdude: input file T1.00f.hex contains 32076 bytesavrdude: reading on-chip flash data:
Reading | ################################################## | 100% 16.32s
avrdude: verifying …avrdude: 32076 bytes of flash verified
avrdude: safemode: Fuses OK (E:FC, H:D1, L:F7)
avrdude done.  Thank you.

thats it done  ! Now running version 1.00f. 

From here I intend to go through the troubleshooting instructions with my new oscilloscope and explore the device.

W8TEE and K2ZIA Antenna Analyzer

Another Arduino based project. This time an W8TEE and K2ZIA Antenna Analyzer.

AABench

Purchased the PCB from https://qrpguys.com/w8tee-k2zia-antenna-analyzer

Not a kit so sourced the components. Easy to order from china off eBay. Took about 2 weeks for all the bits to come in.

Assembled and she started but the SWR for a 51ohm dummy load was off the scale.

The audrino and screen are ok. Checked and double checked solder joints so needed to verify the DDS and SWR bridge operations.

My old Dick Smith device is not cutting the mustard so borrowed an oscilloscope from Lacky VK3ALM. Traced the signal into the SWR bridge and nothing out. Checked the components and well my bad as the 51ohm resistors were in-fact 51K ohm. Bit of a difference. Replaced and off she went !

Downloaded the latest WA2FZW software from IOGroups – https://groups.io/g/SoftwareControlledHamRadio/files/Improved%20Analyzer%20Software

The documentation and a debugging guide are available from this group, essential information.

AAHoused

Use a case from radio parts (CB8808). Yes there is a pimple in the middle. No intention to remove as works fine.

So far have scanned all my antennas at home. I can recommend this device. Not a kit but the process to source and assemble was fun.

04082018 – VK3/VC-024

04082018 – VK3/VC-024  

Went to Mt Beckworth for the VK1 S2S Party.

Third attempt to activate Mt Beckworth this year, first failed as the KX3 battery was flat and didn’t take a spare up to the site, second was changed to Mt Bunnyioung as slept through the alarm. Made it this time

This is a good site for such activities as close and clear.

VerticalSetup

QRPGuys 20/30/40 vertical with an additional 6 ground wires making 9 in total.

It is hard to pick differences without actually running all the antenna up at the same time, but a much better response with the additional ground over the original 3 wires when deployed at Mt Bunnyioung recently.

Didn’t run the end fed out to gain 80m as comfortably qualified and the other sites ended on on these bands.

PackLoaded

This was also a run with the new ‘Compact heavy-duty 7 m mast from SOTABeams’. As you can see the mast nearly fits into my backpack.

This will be great as now will not be harassed when hiking through dense bush (still not returning to Hells Gate !) Bit heaver but figure I just need to get fitter.

Good activation with 15 S2S in the fog. Also 1mm rain but not complaining about that given the drought in NSW.

NewImage

anyway, great activation. Ready for VK JA ZL – EU S2S QSO Party Saturday 20 October 2018 – 06:30 UTC to 08:30 UTC  (Melbourne, Australia*AEDT (UTC +11) Sat, 20 Oct 2018 5:30 pm)