What ¡°mode¡± are you using when you see this?
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I think all Thor modes do send a string of characters ?to ¡°clear the buffer¡±
I hear it go fom low to high pitch tones like a trombone.
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Go to Psk31 and see if you still notice tones at the start and end
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Olivia also sends a string at the start of an Olivia mode from the lowest pitch tone to the highest pitch tone,
which sounds like ¡°boo-beep¡± twice
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de k3eui
barry
Philly
?
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K3EUI Barry