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Table of Contents
Related Manuals for QRP Labs U4B
Summary of Contents for QRP Labs U4B
- Page 1 U4B – Ultimate4 Balloon tracker Hardware manual U4B hardware Rev 1.00...
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Page 2: Table Of Contents
Please read this manual in conjunction with the operating manual and other documentation on the U4B product page http://qrp-labs.com/qdx Contents Contents..................................2 1. Introduction.................................3 2. SAFETY FIRST................................4 3. Know your U4B................................5 4. Parts list..................................6 5. Track layout.................................7 6. GPIO pins 8-18 pad locations............................7 7. -
Page 3: Introduction
Introduction The U4B tracker was developed over a period of 7 years from 2015 to 2022, in collaboration with Dave VE3KCL who has launched 83 test flights from Toronto, Canada. With flight duration from 2 hours to 305 days (10 months, almost 17 laps around planet Earth), they all taught us something and were great fun. -
Page 4: Safety First
U4B set up correctly! Once it’s left your hands, you’re very very unlikely to ever see it again. So you had better be sure it WORKS before you let go! This includes not breaking off the USB tab until the last moment –... -
Page 5: Know Your U4B
Know your U4B U4B is a 33.0 x 12.7mm PCB, using 0.6mm thick FR4 PCB for low weight. SMD components are mounted on both sides of the PCB. U4B hardware Rev 1.00... -
Page 6: Parts List
10x10mm SIM28M GPS STM32F103CBT6 TQFP-48 STM32 chip LM75 SOIC-8 I2C Temperature sensor IC 24M01 SOIC-8 128K I2C EEPROM IC RT9013-33 SOT23-5 3.3V LDO voltage regulator SI5351A MSOP-10 Si5351A Synthesizer MICRO-USB MICRO-USB MicroUSB XTAL 8MHz 3225 Crystal U4B hardware Rev 1.00... -
Page 7: Track Layout
Track layout GPIO pins 8-18 pad locations U4B hardware Rev 1.00... -
Page 8: Parts Layout, Top Side
Parts layout, top side Parts layout, bottom side U4B hardware Rev 1.00... -
Page 9: Schematic
Schematic U4B hardware Rev 1.00... -
Page 10: Circuit Explanation
BASIC commands, set to low or high power mode. There is no Low Pass Filter in the U4B, which has the advantage of allowing it to operate on any band; but the disadvantage that there is no harmonic attenuation; however given the very low power output this is not normally considered a problem. - Page 11 R8/R9. The U4B has 8 GPIO pins presented as pads along the lower edge of the PCB on the bottom side; these are known as pins 0 to 7 in the BASIC programming. They can be written and read as digital outputs or inputs (0V is “0”, +3.3V is “1”);...
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Page 12: Basic Flight Connections
A typical flight configuration has the top end of the top leg tied to the balloon, and the U4B payload suspended directly in the middle of the dipole. The GPS antenna can be made of simple #28 (0.3mm) enameled wire; a 1/4-wave at 1575Mhz is about 45mm. -
Page 13: Resources
The operating manual also explains how to update the U4B firmware (using a USB connection to a PC), and how to set up tracking on the QRP Labs website. For updates and tips relating to this kit please visit the QRP Labs QDX kit page http://qrp- ...
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