HI Walt,
Rex VK7MO has used Q65-15C on 144 MHz with good result for Au contacts.
He said that he used Tx and Rx audio freq set to 700 to ensure that the
Q65 tones remained within the passband of the radios at both ends in the
presence of the Doppler shift/spread. Over a 2 hour period he had an
average Doppler offset of +300 Hz
I am sure that Rex would be interested in hearing from anyone who tries
this here in the States, and I am also sure he'd be delighted to offer
advice if asked.
Given the Doppler shift/spread present with Au and given the Doppler
shift tolerance of Q65-15C as shown in Fig 3 of the following reference
it is not surprising that Q65-15C works for this purpose:
https://w3sz.com/Q65AircraftScatterFinal.pdf
Rex's email address is rmoncur AT bigpond.net.au
Rex did some more testing with Q65-15C with today's Au event and sent me
some of his test results. I have posted them at :
https://w3sz.com/AuroralEvent23April2023.pdf
73,
Roger
W3SZ
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