JUMA Amateur Radio Forum

Finally had time to look at this again. Last time I tried to fix my RX-1, I had disconnected the DDS board altogether. I started by reconnecting it to the RX board, and lo and behold, it booted. I got the greeting, CW on earphones, and everything seems to work. So I assembled the thing, and it still ...

Got a PicKit-3 and a couple new microcontrollers. Programmed a microcontroller with the provided hex file and according to MPLAB IPE, everything went fine. Installed it into the socket, and still the same behaviour: display not booting up, no welcome beep on the speaker but just noise. So it has to ...

Hi! Meh, the oscilloscope I got to use has very low bandwidth, much less than the clock frequency. I could only confirm that pin 4 appeared to be at a more or less steady 5 V. But obviously I couldn't see the clock signal at pin 15 - at this bandwidth, I just got a seemingly stable 2.25 V. Which ...

Hi, and thanks for answering! actually check from the microprocessor's pins to the tracks on the printed circuit board to be certain that there are no open or short circuits here Yeah, I did precisely that. The processor is in its socket and I made the measurements from its pins to other parts of ...

Hi! I finally got around to solder together my Juma RX-1 kit I'd purchased a couple years before. Everything connected, I noticed that my 12 volt power source was broken, so tried to boot the radio up with a 9 volt battery. And it worked: I got the greeting CW on the speaker and welcome message ...