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To Whom It may Interest: I am working on a high altitude balloon tracking project using the firmware of this project. The mock-up of the circuitry includes the Arduino/SI5351 with a uBlox GPS receiver. To test the mock-up the SI5351 antenna output feeds to an RTL-SDR.com USB TV receiver at 20m/14MHz. GQRX is my SDR receiver software, feeding WSJTX. I believe my computer time is correct. When I connect the RTL-SDR to a rooftop antenna, I receive and decode WSPR from several locations, including Europe; I am near NYC. However, when I connect the RTL-SDR directly to my SI5351, I seem to receive the signal all the way through to WSJTX, but it doesn't get decoded. I'm not sure where to go from here, what to change, or what to test. Any help is appreciated. Some screenshots to settings and current results are attached. FWIW, Some of the things I have tried: - calibrating WSJTX to RTL-SDR: slope and intercept - GQRX Input Hardware AGC and LNA adjustments (off and 0 for direct to SI5351) - GQRX Audio Gain adjustments (-50dB, 0dB, 50dB) - GQRX Receiver AGC adjustments (fast and off) Thx, Jeff

Hi everyone. I have assembled several ICT trackers with standard firmware (using timing3). Did some tests using a 50 ohm resistor instead of an antenna - works great. Tell me how to find out which telemetry channel is free and which one I can use for tests with an antenna so as not to disturb anyone. Is this list still up to date? - http://hojoham.blogspot.com/2016/10/known-flight-ids.html. Are there any instructions for adding to habhub? Sorry for my english, I use google translate.

Truly *open source* High Altitude Balloon tracking using Arduino and SI5351 to transmit WSPR, JT9 and/or JT65 telemetry reports. Free for non-commercial use, so long as you keep modifications and derivatives of this code open source. There are existing projects out there on the web, but none from what I could find were open source. One of the more common options is the U3S or a modified variant of that particular firmware. This firmware is in it’s own class. I am not a programmer, so the code may not be perfect, but it works. Suggestions for improvements of the code are welcomed if you have the skillset. *Hardware Requirements:* - Arduino - GPS module (U-Blox 6,7, 8 or other high altitude capable device) - SI5352 module - battery and solar system to suit your needs - antenna (a simple 5 meter per leg dipole, supported with fishing line) *Features:* - sync system time to GPS time - dynamic QTH locator - dynamic telemetry including altitude, speed, temperature and battery voltage - transmission modes can include a combination of JT9, JT65 or WSPR - frequency coverage includes that covered by the SI5351 module - temperature is calculated from the internal thermistor of the Atmega chip on the Arduino *Overview: * 1) GPS is queried for time and system time is set with the function “setGPStime()”, if time is already set, this is ignored with the “timeStatus()” check At this point the GPS is placed into airborne mode (Ublox only) 2) Timing script is called, this script os only run if time has been set, which is critical WSPR, JT9 and JT65 to work. Depending on the timing needed, this can be configured to different intervals, modes and frequencies. Once a timing interval is triggered, a message type is generated by calling “genMessageX()” which in itself will call other functions to generate telemetry data and place it into the “message” string. The message string is then encoded for the specific mode type and transmitted with the SI5351 module * GPS is essential for all functions, timing, locator, altitude, speed, only voltage and temperature are independent, however without proper GPS timing, none of the above matters. *Flashing to your Arduino:* Make sure you change your configurations and flash to your Arduino prior to connecting the Arduino to the GPS module. *Hardware connections:* GPS connects to the Arduino “hard” serial ie “tx” and “rx” pins, don’t try to use soft-serial its very buggy for such a large program as this with so much going on. The SI5351 connects to A4 and A5 of the Arduino which are the I2C pins. Battery voltage monitor connects to pin A7

I am trying to find a BOM (list of parts) for the ICT WSPR tracker. I read the excellent PDF by yo9ict, but a few parts, such as the resonator and the 27MHz TcXO for the Xmiter are proving hard to track down. No part number is given and there are so many to choose from. Can anyone point me in the right direction? Thanks, -Dave

Good Morning! I would like to help to make the balloon balloon through habhub, I am not able to make the script go up the data.

I understand that you can get nice balloons from SBS, but I am looking for the best inexpensive alternative. What is the exact balloon on Alliexpress that is the best one to use for a pico balloon? If you use an aluminum coated balloon which is the best? Thanks Ken

Hi, I have made a pcb of the layout, check for errors, especially RX / TX lines. I cant upload them in the filesection so I have put them here http://www.filedropper.com/wspr if an admin would like to upload them. I have a similar pcb made for the qrp-labs u3s fw so I could probably make a working tracker with this ino file by cuttin two traces in the original pcb and solder in thin wires instead. Can a test board with just the 328 and the 5351 soldered in without the GPS work, or does the code stop if there is no responce from the gps? Toto on the pcb , make a couple of solder bridges so one can reprogram the board without lifting the gps. /Mikael

I have made some changes to the code I found in this group's file download section to do some testing. I am deciding whether I would need to increase the RF output of the SI5351 to ensure its reports are heard during a balloon mission. I am still waiting for parts to build the amplifier to get 200-500 milli-watts output to the antenna. In the mean time, I have been running a WSPR transmitter using a SI5351 module with the output at about 10 mW. I am in northwest Ohio, USA, and have received reception reports from Alaska to Germany to Brazil; over 1000 reports a day. So I'm not sure if spending the additional amperage would be worth it when sunshine and supercaps are all I have for a power supply. My antenna right now is longer than what I will have on the flight, but it's fun to check out the results. If interested, check out the W8AN TX reports at wspr.aprsinfo.com ( http://wspr.aprsinfo.com/ ) and wspr.vk7jj.com ( http://wspr.vk7jj.com/ ). The transmitter is just an Arduino Nano connected to a generic Si5351 module. There is a GoouuuTech GT-U7 GPS module attached for position and time information. My antenna is a 160 meter off-center-fed Windom up about 35 feet. I do have 5 low pass filters from QRP-labs ( https://qrp-labs.com/ ) that are switched in based on the band of transmission. Steve S