On Thu, Sep 26, 2024 at 05:59 AM, James wrote:
Do you have an idea why there's very little output om 60M-30M and too much on 20M & 17M?
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Also the swr on the diagnostic screen is higher than what my SWR/Power meter says. Like I mentioned before, my dummy load measures 49.7 OHMS.?
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James, there are more than one possible reason for the shown values (e.g. T507, LPF section, cables, dummy load). It would be helpful to have some additional values. Could you show for each band:
for RX - supply voltage and current
for TX into dummy - supply voltage and current, from Diagnostics screen PA voltage, output and SWR, from SWR/Power meter output and SWR
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Could you show some pictures,
- for T507 one from each end and one from the bottom side of the PCB,
- for T501 one from each end,
- the whole setup with QMX SWR/Power meter and dummy and
- the dummy?
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After the QMX gets warm, I can no longer power it down unless I unplug it. Do I also have a power supply problem?
Maybe.
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Sometimes the only way to turn it on is by shorting Q104 on the power supply board.
This points in the same direction.
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UpDate---Display is now working.?
How did you bring it to work?
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Am I mistaken, I think I was told that the SMPS status is only supposed to turn on when you press the "T" ?while running the diagnostics and should stay off when pressing the "P" key.?
If you mean the BIAS SMPS it should be ON for "P" and "T".
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73 Ludwig
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