HB9AK: Back to normal 40 m operation: pactor modem QRV agn

Functionality of Pactor modem (DR-7400) could be reestablished. 40 m TRX now supports again modes PACTOR 1-4, VARA (500, 2300, 2750) and ARDOP 2000.
Same modes of course still available on all other bands (80, 30, 20, 17, 15 m). On 30m, also Robust Packet is available. For 10 m operation, please use HB9AK-1 or HB9AK-14.

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