DT values always off??

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Joined: 2015/01/14 - 17:35
DT values always off??


I have a home made WSPR transmitter running. I am pretty sure its timing to the UTC minute is good - the 0th symbol is sent from the PLL for some ahead to get drift to settle, and the output stage is enabled at 1 second past the even minute. This also is 1 second past the minute on the receiving computer's clock. I don't think I have a +- 1 error shifting the transmit symbol buffer.

Never the less, DT shows as -1.9 to -2.1 in WSPR2.0.

- Does anybody else observe something similar?
- What are good DT values, zero?
- Is there WSPR rx software which can better diagnose bit errors (inspect for buffer shift errors in my case)?

73s de HB9FDK..