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I measured the diodes 199 and 201 D197 AM = 8,21 v FM = 8,17 v USB = 0,13 v LSB = 0,03 v D198 AM = 8,20 v FM = 8,17 v USB = 0,12 v LSB =0,03 v I think the problem is here, in the red area

I measured the diodes 199 and 201 D199 AM = 0 v FM = 0 v USB = 8,15 v LSB = 8,15 v D201 AM = 0 v FM = 0 v USB = 8,14 v LSB = 8,14 v Does anyone know what is the equivalent of c111 ? Thank you

I measured the diodes 207,208,209 D209 measures cathode side AM = 4,64v FM = 4,62 v USB = 8,10 v LSB = 8,08 v measures anode side AM = 0v FM = 0 v USB = 8.9 v LSB = 0 v D208 measures cathode side (yellow marker) : AM = 4,63v FM = 4,61v USB = 8,11v LSB = 8,11v measures anode side : AM = 0v...

I made a check on pin 7 of ic4, in USB LSB AM FM I have the same voltage 7,87 volts Thanks again for the help

From scheme 207-208-209 are 1ss135

Handy Andy thanks for the explanation, I will check the voltage of pin 7 of ic4. I have a question the diodes 1ss135 (207-208-209) are varicap right ? Which equivalents can I use?

Sonoma do you have an e-mail address of the magnum ? Thank you

Thanks also to you sonoma

Robb this is the area ?

Hi Rob, thanks for answering me, can you tell me which diode following the wiring diagram ? Thank you

has anyone ever had this problem ? Thanks

I found a video with the same problem as mine. I think will be clearer

Hi everyone, This is the anomaly that occurs on my Magnum Delta Force: In AM and FM and LSB everything works correctly, when I switch to USB the s-meter rises almost to full scale and the radio becomes silent. If I turn off the radio switched to usb mode and after some time i turn on it works...