[hpsdr] Hermes - PTT and ssb latency

[Barry N1EU]

Thanks very much Bill for clearly explaining the existing feature which
could never fix the problem I brought up.

Speaking strictly of SSB, we have manually operated PTT along with spoken
audio and we have voice keyer PTT and audio.  In both cases, we will
experience truncation of the tail end of audio xmsn because PTT break
causes Hermes to end xmsn before the audio completes.  A feature is needed
that will add a delay between PTT break seen by Hermes and the ending of
xmsn by Hermes.

73, Barry N1EU


On Mon, Oct 28, 2013 at 10:01 PM, Bill Diaz <william.diaz at comcast.net>wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
>
>  Barry,
>     The  "Enable PTT Delay" check box actually functions exactly as
> described in the hint/tooltip of the check box: "Check this box to delay
> PTT OUT line after releasing PTT in".
>
>    Unfortunately for your application, it is referring to the "PTT OUT
> line", which is normally attached to an external device such as an
> amplifier.   "PTT OUT Line" is available via the RCA jack on the
> ANAN-100/ANAN-100D rear panel  and on  Accessory Port DB25-1.
>
>     I set my test delay to 1200ms and can confirm PTT OUT remains
> activated for about that time period after I release PTT IN.
> Unfortunately, as soon as I release PTT IN, mic audio/modulation is no
> longer applied to the SSB signal, as you observed.
>
> Bill KC9XG
> On 10/28/2013 4:27 PM, Barry N1EU wrote:
>
> ***** High Performance Software Defined Radio Discussion List *****
>
>
>
>
>  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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