On 8/29/2014 9:50 PM, kd1yv@... [Raspberry_Pi_4-Ham_RADIO] wrote:
If there is a more appropriate forum for WSPRRY, kindly point me there.
Hi Jim,
I'm sure you're aware of the WSPR Forum, otherwise it seems this is the place.
I just installed WSPRRY on a model B. I connected it through a
commercially-made 20m band pass filter to a large loop antenna.
I have not seen any reception reports even after transmitting for
several hours on 14097000. I decided to monitor it on my HF receiver,
and can clearly hear when the transmission start and stop.
It sounds like you've got what it takes - but I've found the antenna to be all-important with R-Pi-level power (40mW). I don't know if you mean you're using a magnetic loop or a larger loop that is tuned to 20 meters, but I suspect either will work if resonated and fed with low-loss feedline. I have a mag loop halfway completed that I was going to try on WSPR but can't speak from personal experience (yet). .
But having put my WsprryPi beacon bask on the air again just yesterday I can report that I am getting between 2 and 6 spots from US reporters every transmission, using a 3 element SteppIR at 55 ft. In the past when I used my HyTower vertical antenna, the spot rate would be significantly lower but it was still heard. If you still get no spots, I'd try a simple 20 meter dipole, even if it's not very high, as this would provide a basis for comparison.
I expected to hear some varying tone, perhaps like those I hear when I
operate WSJT. What my untrained ear hears sounds more like a constant
carrier, with the tone not seeming to change. Does this mean
something is wrong?
Probably not, the frequency shifts are so small (around 1.5 Hz) that it's very difficult to detect them by ear.
I tried 2 different packages. The screen displays are different, but
the results seem to be the same.
"
and "git clone
Suggestions appreciated.
I use the JamesP6000 verision exclusively due to the brilliant self-calibration feature he created. It has eliminated the #1 source of frustration from my earlier attempts and I recommend it, otherwise you'll have to come up with the required frequency correction factor using one of the other methods described. WSPR requires a high degree of frequency accuracy and real time synchronization, and this version can do both automatically from the command line. I also like the "-o" or Offset feature, which changes your transmit frequency slightly to increase the odds of being heard.
It's amazing to know that an I/O pin on a computer can generate a signal that can be heard all around the world. Keep trying and I'll look for your call on the WSPR map soon!
73, Bob W9RAN
