Original QCX 40M

Ron Pearson All Messages By This Member #143260 The QCX was returned to me as "Not Working." I set it up on a 12vDC battery and dummy load. Then used a signal generator and found that the QCX was receiving a signal. Also, using another radio (FT-891) I transmitted and the 891 received the QCX signal. Next I put in on the osciliscope and found that the output was 1V peak to peak. At this point I checked Q1, Q2 and Q3. All were functioning properly. Here I began checking the IC's. The pins I did not list here are within specs. The ones listed were not. IC5 pin 5 (2.28 is actually showing 12v IC5 pin 8 11.67) is 2.55 IC6 pin 3 (1.63) is 2.66 IC6 pin 5 (1.55) is 11.67 IC6 pin 8 (11.67) is 2.66 IC7 pin 3 1.99) is 2.60 IC7 pin 5 (1.89) is 11.67 IC7 pin 8 (11.67) is 2.66 IC8 pin 3 (0.65) is 2.57 IC8 pin 5 (0.65) is 2.57 IC8 pin 8 (11.67) is 2.60 IC9 pin 3 (0.65) is 4.49 IC9 pin 5 (0.67) is 11.67 IC9 pin 8 (11.67) is 2.56 IC10 pin 5 (4.21) is 11.67 IC10 pin 6 (3.94) is 5.94 IC10 pin 8 (11.67) is 5.90 This is as far as I got. Sorry for the 1st email, Hans. I have torn the bicep in my left arm and probably took too many pain killer before I emailed.. Hi Hi Any help will be most appreciated... Thank You Ron Pearson KA5HZV
Ronald Taylor All Messages By This Member #143278 Ron, it looks like you might be counting the IC pins wrong. You show about 12 v on pin 5 and about 2.5v on pin 8. It should be the opposite. Looking down on the top of the IC with the notch or dot at the top, the top left pin is 1 and it counts counter clockwise around from there with pin 5 at the bottom right and pin 8 at the top right. Hope that makes sense.? Ron toggle quoted message Show quoted text On Tue, Apr 15, 2025 at 20:51 Ron Pearson via <ka5hzv=[email protected]> wrote: The QCX was returned to me as "Not Working." I set it up on a 12vDC battery and dummy load. Then used a signal generator and found that the QCX was receiving a signal. Also, using another radio (FT-891) I transmitted and the 891 received the QCX signal. Next I put in on the osciliscope and found that the output was 1V peak to peak. At this point I checked Q1, Q2 and Q3. All were functioning properly. Here I began checking the IC's. The pins I did not list here are within specs. The ones listed were not. IC5 pin 5 (2.28 is actually showing 12v IC5 pin 8 11.67) is 2.55 IC6 pin 3 (1.63) is 2.66 IC6 pin 5 (1.55) is 11.67 IC6 pin 8 (11.67) is 2.66 IC7 pin 3 1.99) is 2.60 IC7 pin 5 (1.89) is 11.67 IC7 pin 8 (11.67) is 2.66 IC8 pin 3 (0.65) is 2.57 IC8 pin 5 (0.65) is 2.57 IC8 pin 8 (11.67) is 2.60 IC9 pin 3 (0.65) is 4.49 IC9 pin 5 (0.67) is 11.67 IC9 pin 8 (11.67) is 2.56 IC10 pin 5 (4.21) is 11.67 IC10 pin 6 (3.94) is 5.94 IC10 pin 8 (11.67) is 5.90 This is as far as I got. Sorry for the 1st email, Hans. I have torn the bicep in my left arm and probably took too many pain killer before I emailed.. Hi Hi Any help will be most appreciated... Thank You Ron Pearson KA5HZV
Ron Pearson All Messages By This Member #143283 Ron... Tnx for the Heads up! You are correct. I'm scheduled for surgery this afternoon so I will be out of my shack for a while. I did re-check the IC's again and a couple ?are still questuinable. Thanks for your help... Ron ? toggle quoted message Show quoted text On Apr 16 2025, at 8:00 AM, Ronald Taylor via groups.io <wa7gil@...> wrote: Ron, it looks like you might be counting the IC pins wrong. You show about 12 v on pin 5 and about 2.5v on pin 8. It should be the opposite. Looking down on the top of the IC with the notch or dot at the top, the top left pin is 1 and it counts counter clockwise around from there with pin 5 at the bottom right and pin 8 at the top right. Hope that makes sense.? Ron On Tue, Apr 15, 2025 at 20:51 Ron Pearson via <ka5hzv=[email protected]> wrote: The QCX was returned to me as "Not Working." I set it up on a 12vDC battery and dummy load. Then used a signal generator and found that the QCX was receiving a signal. Also, using another radio (FT-891) I transmitted and the 891 received the QCX signal. Next I put in on the osciliscope and found that the output was 1V peak to peak. At this point I checked Q1, Q2 and Q3. All were functioning properly. Here I began checking the IC's. The pins I did not list here are within specs. The ones listed were not. IC5 pin 5 (2.28 is actually showing 12v IC5 pin 8 11.67) is 2.55 IC6 pin 3 (1.63) is 2.66 IC6 pin 5 (1.55) is 11.67 IC6 pin 8 (11.67) is 2.66 IC7 pin 3 1.99) is 2.60 IC7 pin 5 (1.89) is 11.67 IC7 pin 8 (11.67) is 2.66 IC8 pin 3 (0.65) is 2.57 IC8 pin 5 (0.65) is 2.57 IC8 pin 8 (11.67) is 2.60 IC9 pin 3 (0.65) is 4.49 IC9 pin 5 (0.67) is 11.67 IC9 pin 8 (11.67) is 2.56 IC10 pin 5 (4.21) is 11.67 IC10 pin 6 (3.94) is 5.94 IC10 pin 8 (11.67) is 5.90 This is as far as I got. Sorry for the 1st email, Hans. I have torn the bicep in my left arm and probably took too many pain killer before I emailed.. Hi Hi Any help will be most appreciated... Thank You Ron Pearson KA5HZV
Ron Pearson All Messages By This Member #143296 Ron... You are correct. Still have a couple IC's with questionable readings. On the way to get my torn bicep repaired so will continue later. Your help is much appreciated... Ron

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Original QCX 40M