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qcx powers up, but no calibration tone
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Hi Tom You can do a factory reset with menu "7.8 Factory rst.".? Please do that then have another try. 73 Hans G0UPL On Mon, Jan 15, 2018 at 8:20 AM, Thomas Yarish <yarishwt@...> wrote: Just fired up QCX first time.? Got to initial calibration menu but there is no tone. |
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Just a thought - if you used sockets on the audio chips, verify that all I.C. pins in the audio chain before the bandpass filter are properly plugged into their socket pins. the bpf peaking test relies on looking at audio at the output of the I.C. chain of IC56, IC6, and IC7.? It is easy to have pins slip past the outside of the socket or bend underneath the chip. I had this very problem and discovered it after the "Peak BPF test" didn't work and I had a 2 amplitude with no effect on the position of the C1 trimmer cap. I didn't have headphones plugged in, or it would have alerted me to the problem sooner.? ?
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On Jan 15, 2018, at 4:34 AM, Steven Dick <sbdick@...> wrote: Just a thought - if you used sockets on the audio chips, verify that all I.C. pins in the audio chain before the bandpass filter are properly plugged into their socket pins. the bpf peaking test relies on looking at audio at the output of the I.C. chain of IC56, IC6, and IC7.? It is easy to have pins slip past the outside of the socket or bend underneath the chip. I had this very problem and discovered it after the "Peak BPF test" didn't work and I had a 2 amplitude with no effect on the position of the C1 trimmer cap. I didn't have headphones plugged in, or it would have alerted me to the problem sooner.? ?
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