My BitX40 has been finished and mods for Ver 1.27 were installed. I wrote earlier that I had forgotten to install the 4.7K resistor when I connected the RXTX line. (History: the basic BitX before mods was working perfectly.) I put in the resistor, and re-flashed the Arduino (12 volt supply was off and both plugs to and from the BitX were disconnected) and then re-connected the two plugs and the power supply.
I tried to re-calibrate and the tuning was erratic. The lowest frequency seemed to be set at 7.010. I tried to set the lowest and highest frequencies but when I would bottom out the pot it would immediately stop. The frequency was going down so fast that it was difficult to slow it down to select a frequency. The same thing happened up on the high end of the pot. I ultimately was able to set the low frequency to a little under 7.000 mhz and continued on with the calibration. The tuning was very difficult and would only go up or down in 10 hz steps until I hit the bot tom or the top of the 100K pot. Then it would jump extremely fast.
When I was trying to calibrate the board right after the upgrade, I may have screwed up the LSB/USB settings as I was having difficulty in getting a zero beat while doing the USB calibration. Could I have screwed up the main oscillator setting? Also, I had read in one of the posts that re-flashing the Arduino with Ver 1.27 does NOT re-set the original values . Is that right? If so, how can I clear out the bad settings?
I’m about ready to pull the radiuno out and put in another that I have programmed with Ver 1.27 to see if that will work. I really don’t want to have to do that if someone here can give me some direction to re-set the Arduino.
BTW, the Bitx board seems to receive o.k. and will transmit 5+ watts. Please let me know if you have any suggestions as to how to get the board back to original settings and/or if you think I might have damaged it when I left out the 4.7 K resistor on the RxTx mod. Thanks for any suggestions. It’s greatly appreciated.
Keith - AGØH