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Saturday, 15 March 2014

Multi-function AD9850 MEPT with WSPR, QRSS & Sequential Multi-Tone Hellschreiber (GPS & ntp versions)

My QRSS and SMT-Hell signals received by the PA9QV grabber on 40m

Building on my Arduino & AD9850 powered WSPR transmitter I have extended the code to also transmit QRSS CW and Sequential Multi-tone Hellschreiber.

The three modes are transmitted in sequence, although WSPR takes precedence. The tx cycle is something like this:
- SMT-Hell

I have had a problem where my GPS was not getting a fix and so I was not able to get the correct time for the WSPR transmissions. Consequently, I have created two versions of the sketch. One uses a GPS for its time source and the other uses the Internet Network Time Protocol (ntp). The ntp version requires an Arduino Ethernet shield and Internet connection.

I have learnt a huge amount about Arduino programming while working on this. However, I am going to stop tinkering with the programming now and use it to test out some different antennas.

The enhanced GPS sketch can be downloaded from here and the ntp version from here.
Note: you will also need to download and install a few libraries:

The alphabet in Sequential Multi-tone Hellschreiber,
monitored on my receiver.

There are three places that variables need to be changed in the sketch. These are:

QRSS frequency:
//***************Adjust this frequency to position your signal in the band
#define QRSS_IDLE    10.139870e6

WSPR tones:
//*******************Create the WSPR tones for your callsign/qth/power using the instructions
//*******************on M1GEO's website http://www,
//HOME: G0FCU 24dbm (300mw 24dBm)
/* static byte WSPR_DATA_HOME[] = {3,3,2,0,0,0,2,2,1,2,0,0,1,1,1,2,2,2,1,2,2,3,0,3,

QRSS/SMT-Hell text:
//******************enter your callsign in the next two variables, replacing the 'xxxxx'
//******************The callsign_hell can contain '/' or space as well as a locator
char callsign[]="G0FCU"; //callsign to send in QRSS mode
char callsign_hell[]="G0FCU/IO91SE"; //text to send in SMT-Hell mode

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