Home High School Projects Project 2

NASA CERN HARVARD THE NORTH POLE PROJECT PROJECT 2 PROJECT 3 PROJECT 4 EXPO CANADA

WSPR

DX UnO STANDALONE WSPR TRANSMITTER

DX UnO Standalone WSPR Transmitter is a QRPp, 300 mW RF power output WSPR transmitter that works on 10m/28.126100 Mhz WSPR amateur radio frequency.

DX UnO WSPR Transmitter is compliant with FCC harmonic specifica􀆟ons and Amateur Radio frequency band plan.

WSPR protocol is developed by K1JT, Joseph Taylor to work as a beacon to reach long distances with low power transmitters.

WSPR stands for WEAK SIGNAL PROPAGATION REPORTER which is extensively used by Amateur Radio Operators to check propagation conditions in relative to their locator grid.

Here is the link for WSPR information:

https://en.wikipedia.org/wiki/WSPR_(amateur_radio_software)

Block Diagram Of DX UnO Wspr Transmitter:

WSPR signals are received by other amateur radio operators around the world and automatically registered in WSPRNET data base site.

Here is the link for WSPRNET site:

https://www.wsprnet.org/drupal/wsprnet/map

All receivers picking up the particular transmitting callsign can be filtered and shown on a map.

Also, as a table consisting of receiving stations and their distance in relative to transmitting station and signal strength.

DX UnO Standalone WSPR Transmitter is a WSPR compliant transmi􀆩er that does not need a computer to generate and transmit WSPR messages. It has a built-in microcontroller(Arduino Uno) that controls the transmittier and prepares and transmits WSPR messages every 4 minutes.

DX UnO WSPR Transmitter consists of:

- A Microcontroller (ATMEGA328P – Arduino UNO MODULE)

- A PLL Oscillator(SI5351)

- A BUFFER/ RF Amplifier(74ACT244)

- A Low Pass Filter to filter out Transmit signal.(7 Pole Chebyshev FILTER)

- A GPS Receiver for Time base and Maiden Grid Locator information.

DX UnO WSPR Transmitter operating steps:

1- Acquire GPS time and coordinate

2- Calculate Maidenhead Grid Locator of transmit coordinate

3- Prepare WSPR Message

4- Wait for even minute to start 2-minute WSPR transmission sequence

5- Pause for 4 minutes after completion of WSPR message Transmission

6- Restart from step 1 after 4-minute pause delay.

DX UnO WSPR Transmitter Technical Specifications:

- RF Transmit Frequency: 28.126100 Mhz.

- RF Power output: 300 mW.

- 2nd Harmonic Suppression: -60dbm

- 3rd Harmonic Suppression: -65 dbm

- DC SUPPLY POWER Voltage is 5V/300 mA or 12V/300 mA

DX UnO WSPR TRANSMITTER can be powered with a standard 5V USB power supply similar to a USB wall charger or 12V/300 mA DC power source with 2.1 mm Barrel connector.