Hi Bill,
On 11/25/2015 11:56 AM, Bill Somerville wrote:
> On 25/11/2015 16:47, Joe Taylor wrote:
>> On a related matter: I note that the diaplayed DT values are lower by
>> 0.2 s than what I think they should be, based on the test files
>> generated by jt65sim. Right now, I don't know where this 0.2 s offset
>> is coming from. (It looks like half a symbol, maybe?)
> Not sure if this is relevant but I was just testing the latest
> development revision through an audio loop back and I see Rx DT as 0.0.
Thanks for reporting this result. In jt65sim, if you specify DT=0 the
Tx message starts exactly 12000 samples (= 1.0 s) into the file. The Tx
message generated by WSJT-X supposedly does the same thing.
However, in your audio loop back test you also have a latency on both
audio output and audio input channels. Possibly these amount to as much
as 0.2 s ?
I don't see this as a very big issue; I was just trying to understand
the details of what's happening.
-- Joe
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