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2) Select "Save link as ...."
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Multifunction Project (QEX July/August 2020)
A Simple and Inexpensive Auto-Calibrating Multifunction Project (QEX July/August 2020) This is a menu driven multifunction project that includes a band switched two channel 110 kHz – 112.5 MHz VFO, band switched 6 – 2200 m WSPR source, 0 – 6.5 MHz frequency counter, and a clock that displays time, date, and temperature. Frequency and time accuracy are maintained by a highly accurate temperature compensated DS3231 real time clock (RTC) board.Download information:
W3PM Multifunction Project PDF - Updated
Auto-Calibrated GPS/RTC Si5351A FST4W and WSPR MEPT
This Manned Experimental Propagation Transmitter (MEPT) uses the very popular Arduino Nano and Si5351A clock generator board to generate LF – 10 meter FST4W or WSPR signals. Frequency and time accuracy are maintained by a highly accurate temperature compensated DS3231 real time clock (RTC) board or by using a GPS receiver.
Auto-Calibrated Si5351A Quadrature (IQ) VFO Project
This is a VFO using the very popular Si5351A clock generator board to generate 80 – 6 meter I/Q signals at outputs CLK 1 and CLK 2. Frequency and time accuracy are maintained by a highly accurate temperature compensated DS3231 real time clock (RTC) board.
GPS Display and Time/Gridsquare Synchronization Source
This inexpensive and easy to build small battery powered device will not only provide time synchronization for the W3PM WSPR project, but makes an ideal pocket sized travel companion.
Displayed GPS parameters include: • Time • Day of the week and date • Grid square • Number of satellites in view • Latitude and longitude • Speed (knots, kph, mph) • Altitude (meters and feet) • Distance to home or other selected location (km and miles) • Bearing to home or other selected location
Auto-Calibrated RTC GPS WSPR Si5351A Project
This is a full featured WSPR signal source using the very popular Si5351A clock generator board. Frequency and time accuracy are maintained by a highly accurate temperature compensated DS3231 real time clock (RTC) board. Extensive menu options allow the user to change all necessary parameters in addition to selecting a built in SWR bargraph indicator for antenna adjustments. Band switched WSPR bands cover 6 – 2200m.
A Small Portable SWR Indicator and Signal Source
This small battery powered microprocessor controlled device will help you rapidly tune your 630 – 10 meter antenna to resonance or serve as a 100 KHz – 112.5 MHz signal source.
Si5351 Arduino Controlled GPS Corrected VFO
(QEX July/August 2015)
Updated 24 Sept, 2016
Si5351 Arduino Controlled GPS Corrected VFO Article
New version with improved code to allow 9600 baud operation courtesy of Jan, PE1CID. (Requires change of line 260 for 9600 baud):
Link to new sketch by SQ1GU:
Eagle files for PCB production courtesy of Gary, KF9CM:
Basic Stand-Alone VFO Configuration
GPS Corrected VFO Configuration
WSPR Symbol Generation Utility For Compound Callsigns With 6 Digit Locator
This is a self-contained utility that, in one go, will generate a text file for use with PIC assemblers. The utility will generate either conventional callsign/4 digit locator or compound callsign/6 digit locator data. Compound callsign generation follows K1JT’s convention of a three or less letter/number combination prefix followed by a “/”. A one letter or two number suffix may be used preceded by a “/”.
A Simple Mobile/Portable WSPR Beacon Controller
This project provides a simple means of generating an audio WSPR signal using either an Arduino Nano or Arduino Uno to drive a SSB transmitter for mobile or portable WSPR beaconing.