On 06/04/2018 14:08, David Alloza wrote:
Dear developers,
I am wondering how we can decode FT8 message send by a frequency drift
transmitter .
Do we know from what level of frequency drift a message become impossible to
decode ?
Do you have any idea how the minimum SNR decoding level is impacted by a
frequency drift?
Regards,
David F4HTQ.
Hi David,
modes used for EME and other VHF and up propagation paths necessarily
have to deal with changing frequency. I don't believe FT8 has explicit
compensation. Given that, so long as the drift is no more than half the
tone spacing over a transmission I doubt there is much impact. So that
would be a drift rate of less than 12.5Hz/minute (50Hz ÷ 8 ÷ 2 = 3.125Hz
× 4 per minute), above that degradation will be rapid.
73
Bill
G4WJS.
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