[arm-allstar] Delay with Kenwood NXR710 and Hamvoip Node

[David McGough]

Hi Chris,

That sounds about typical, with RXAudioDelay set to 10 (200mS), using 
SimpleUSB.  With some performance tuning, you may be able to reduce the 
delay somewhat; the best currently possible is perhaps about 270mS, 
total.

The best way to obtain latency data is to generate a quick audio pulse
through the system, such as by quickly clapping your hands once.


73, David K4FXC


On Tue, 23 May 2023, Chris via ARM-allstar wrote:

> I'm unsure where to look first for a solution.
> 
>  
> 
> Problem:
> 
> With a single Kenwood NXR710 repeater using a connected Allstar node as
> controller, running Hamvoip, how much delay should I hear between what I'm
> saying into my HT and what I'm hearing come back from the repeater?
> 
> I imagine there is a slight delay in the repeater internally, plus some
> delay as audio passes to and from the node, but it shouldn't be this long,
> should it? That sounds like around half a second!
> 
>  
> 
> Here's an audio example recorded on my iPhone. It starts to feed back
> because the second radio is being picked up by the first, which gives a
> clearer idea of the timing here.
> 
> You'll also hear a little of my voice repeated when I quickly unkey.
> 
> https://www.dropbox.com/s/iiyjn87xx1yc88o/KenwoodNXR710_and_HamvoipDELAY.wav
> ?dl=1
> 
>  
> 
> What we are trying to do is have functions, ID and other timing handled by
> the Allstar node. We want the Kenwood to stay fairly dumb comparatively,
> handling RX and TX, CTCSS decode/encode etc.
> 
> Is there perhaps something in the Kenwood we forgot to turn off that is
> delaying everything? Or something I need to adjust in Hamvoip?
> 
>  
> 
> The only delay I've adjusted on the Hamvoip node really is RXAUDIODelay, to
> eliminate squelch tail from being broadcast, and I have it set to 10 or
> about 200 MS.
> 
>  
> 
> Ideas welcome.
> 
>  
> 
> Thanks
> 
>  
> 
> Chris
> 
>  
> 
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