I am not a programmer and have only just started with aurduino uno I have had a look at the sketch but cannot see where to change the frequency
The Arduino QRSS shield output frequency is controlled by the crystal on the shield board. To change the frequency you have to adjust the trimmer capacitor.?
if you are referring to the amount of shift between the key-up and the key-down frequencies: it's these two lines shown below:
#define FSK_HIGH 160 // Analog value for when FSK is high
#define FSK_LOW 100 // Analog value for when FSK is low
You can experiment with other values between 0 and 255. If the "height" of the FSK produced is too high, you can bring these numbers closer together. If the FSK is too small, you can make the two numbers further apart e.g. reduce the FSK_LOW number.?
It is unlikely, but if you find that the amount of FSK you observe is too big or small to be adjusted by FSK_LOW and FSK_HIGH, then you have to change the value (a.k.a. length) of the C3 "gimmick" capacitor.
the callsign was easy, I take it I can add stuff like 73 and my locator or is there a limit to the size?
You can add 73 and your locator. I am sure there is *some* limit to the size, but it's plenty more than you'll need!
