|Gadget Gangster in use as a 25mW WSPR/Opera beacon|
WSPR was the thing I originally wanted to try when I decided to get the Gadget Gangster: I hadn't even heard of OPERA at that time. But I was unsure whether I would be able to generate the FSK frequencies WSPR uses: four tones separated by about 1.48Hz. Jeff decided to shoot as near as he could and programmed for a 2Hz separation of tones, and found that the signal was decoded by K1JT's WSPR program. So no problem!
I measured the RF output from the Propeller board and it was somewhere in the region of 25 to 40mW, depending on which measurement method you believe. I also looked at the output using my oscilloscope.
|Output waveform from Parallax Propeller on 80m|
|WSPR spots for 25mW Propeller beacon|
An advantage of the OPERA mode is that it is not time synchronous so I can leave the beacon running in that mode with an arbitrary delay between transmissions. My first OPERA transmission also produced several spots, including reports from fellow bloggers PC4T and G4NKX.
|OPERA spots for 25mW Propeller beacon|