Hello again,
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today my QMX went partly deaf again.
I checked the bias voltage at R401/402 and it was just 0.5V. Grabbing Chipquik and an fresh 74BT3253 solved the issue within 15 minutes.
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This is now the second time that I had to replace this IC and I searched a little bit in the forum. There are some comments that the MUX might be damaged in combination with the 50W PA, which I'm also using. Is there a confirmation for this? Are the both devices not compatible?
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I just would like to avoid to change the IC every second week and I'm also curious if and why this could be related (or what esle could be the reason).
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73
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Dirk? -? DK7CVD
Dirk