sync162.f expanding the hunt for MEPT_JT sync signals

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WA3LTJ
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sync162.f expanding the hunt for MEPT_JT sync signals

WSPR requires a clock accuracy of +/- 1 sec. Nearly all WSPR stations on the air maintain this accuracy. Could a station used a modified version of WSPR to synchronize it's internal clock to an even minute, given no a priori time setting? This un-synchronized station would record 4 minutes of audio, then search for a best fit DT and DF across the entire 4 minute recording. The current sync162 imposes a narrow search. Is that necessary? Is there any reason a MEPT_JT sync signal cannot be extracted from a long record?

I expect that multiple candidate start frames will arise depending upon the SNR criterion. Each would be tested post hoc by attempting to decode those 110.59 s segments. The first segment with a valid report is kept.

Obviously, network or GPS time-keeping solutions have their advantages, but this question does addresses the rare circumstance where these are less convenient.