[hpsdr] Hermes - PTT and ssb latency

[Barry N1EU]

I've done some testing looking at transmitted audio waveforms recorded off
a second receiver and finding that the "Enable PTT Delay" control under
General-Options of PSDR is NOT functioning.  I've dialed in multiple
hundred msec delay and there is no change in the amount of audio being
truncated at the end of a xmsn.

Has anybody gotten this to work with Hermes or otherwise tested it?

73, Barry N1EU


On Mon, Oct 28, 2013 at 12:02 PM, Barry N1EU <n1eu.barry at gmail.com> wrote:

> Okay, I just found the "Enable PTT Delay" control in PowerSDR (duh).
>
> sorry for the bandwidth but perhaps other dummies can learn something
>
> 73, Barry N1EU
>
>
> On Mon, Oct 28, 2013 at 8:22 AM, Barry N1EU <n1eu.barry at gmail.com> wrote:
>
>> After participating in the CQ WW SSB contest this weekend with a Hermes
>> based SDR that has only recently come into the shack, I now realize the end
>> of every xmsn of mine was clipped off.  When I released PTT, the audio
>> stream hadn't yet completed due to latency (duh).  I received a comment to
>> this effect during the contest and when I review a few of the soundclips I
>> recorded, it's painfully evident.
>>
>> Assuming the latency is inherent in the Hermes architecture, I would
>> think there needs to be an option in the Hermes firmware to delay the break
>> (tail end or release) of PTT.  The option could be enabled by PowerSDR, as
>> well as setting the amount of delay either manually or automatically by
>> internal latency calculation.
>>
>> 73, Barry N1EU
>>
>
>
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