I have just fixed up a bitx40 for a friend. I've loaded it with the firmware compiled from??and done all of the mods I can find for both that firmware and general rig stability. For LSB it works great! 10W, under legal limit for harmonics, IMD looks good. I'm happy! (I'm happy enough that I may want to go buy one for myself now..)
So, the four stupid questions I have:
* is it ok to run it from a solar setup? the friend in question has a solar setup that floats between 13 and 14.5v? Or will it get angry if you feed it above 13.8v?
* i needed to put that trim cap on the IF crystal to get it a little below the 11.995MHz it was sitting at - that and 12MHz didn't result in a good passband through the IF filter. Is that normal? I take it the 12MHz filter isn't always at 12MHz but it was quite off (like, could only get 1/2w out and was deaf as a brick before I tweaked it off)
* The VFO calibration is off by about 280ppm, and the USB offset for the above firmware was -1300ish Hz, rather than being /anywhere/ near the?+1500Hz it defaults to. Is that acceptable? That math feels a bit "off" somehow..
* .. and it's also quite a bit deafer on USB than LSB, even with the suggested two caps removed and max drive strength. I take it USB isn't the primary reason for this radio, but have others seen this?
