Hi Bill,
As you noted, these latencies won't cancel out -- they'll be cumulative.
One reason why I don't see this as a very big issue is that whatever
these latencies (and additional ones from the receiver itself) may be,
they are *very* unlikely to be as large as the uncertainty we have
always allowed for in the computer clock and its movement through the OS
into the Tx and Rx software. That's why a range as large as -2 to +5 s
makes sense -- asymmetric to allow for the 2.5 s EME delay.
-- Joe
On 11/25/2015 12:46 PM, Bill Somerville wrote:
> On 25/11/2015 17:37, Joe Taylor wrote:
>> 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 ?
> Understood, but it was suspicious that I get exactly 0.0 unless we have
> fudge factors in place somewhere or the latencies exactly cancel. I can
> tweak the latency of the loop back itself but not the channels used by
> the two copies of WSJT-X and the channels they write/read.
>>
>> I don't see this as a very big issue; I was just trying to understand
>> the details of what's happening.
> Perhaps it is as simple as the latencies cancelling out and a
> synthesised sample stream needs to be adjusted to add in some recording
> latency. I have often wondered about the consequences of using a DSP Rx
> and he extra latency that would add to the Rx path.
>
> 73
> Bill
> G4WJS.
>
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