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Transmit unreadable on low freq - Microair

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Guido Lepore

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Microair 760 Comm. Go out flying and on the way back in I call tower on 118.1 and they say I am unreadable. I can receive just fine. Suspecting low voltage I check the battery voltage and I'm at 12.3-12.4v. I call them back on ground freq 124.3 and they can receive me fine. So I brown-nose my way into a landing clearance staying on their ground frequency. Taxiing in I give them one more try on 118.1 and they say whoever keeps calling is unreadable and garbled.

Any idea why I am unreadable on 118.1 but ok on 124.3? I was ok on 118.1 when I took off earlier, which is why I suspected a voltage drop, but 12.3 (measured with the Transponder) should still be lots of volts.
 

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