Hello Stan, Ludwig and Kevin,
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I did'nt give up!?I ordered a mid-band QMX kit and it works good (but produces little bit too much power (6+ W) on 60 and 15 meters).
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The QMX+ rev 3 does not start. With power button pressed, it takes 0.8 A current which slowly decreases to 0.5A.
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Vcc and Vdd are around 0.1 V.
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Testing diodes with a DMM: D108 shows 0.17V and 0.2V, D109 shows 0.11V and 0.12V.
meaning that both diodes are damaged. But as the diodes are in-circuit, these values are probably meaningless.
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Resistances:
Vdd - GND 184 ohm
Vcc - GND 2.4 kohm
Vdd - Vcc 9 kohm.
These were measured with the DMM black probe at GND or Vcc.?
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But when I swap the probes, the readings are
Vdd - GND 1.2 kohm
Vcc - GND 313 ohm
Vdd - Vcc 1 kohm.
Why?
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I also received some spare SMPS'es and installed those to the older QMX+ rev 1 which I broke by accidentally inserting faulty SPSM'es from another faulty QMX.
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Receiver works ok.
Diagnostics page is all OK except TX Voltage which is RED showing 10.4 volts (DC input is 12.2V)
Pressing "T" changes TX voltage to GREEN 9.8 volts, power 0.0W and random SWR values.
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Apparently something in the TX chain is destroyed.
I have no oscilloscope. Is there something that I could check with an ordinary DMM?
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73 Matti OH6BEX
