[hpsdr] FFT latency

[John]

Hi Peter,

I use a Hermes SDR with a Penny Whistle PA and it works well using CW 
breakin.   I generally run at 20 -25 wpm and use the rig mostly on 6 
meters (my other rig runs more power on the HF bands so most of the 
time I use it).  In 55 years as a ham I still have not used VOX very 
much, but I don't operate much phone anyway.

If you think about it there are delays in non-SDR rigs, too.  For 
example, it takes a while for an envelope detector to charge up its 
filter capacitor (perhaps there is a better term for this component).

Best regards,

John,  WoGN



At 05:54 AM 4/5/2015, G3XJP wrote:
>***** High Performance Software Defined Radio Discussion List *****
>
>I need your collective wisdom!  Is it not an inescapable fact that 
>any serious FFT in the real-time path between your antenna and your 
>ears must introduce an inherent and inevitable delay that will 
>preclude a conversational VOX/QSK QSO?  I can see that it would not 
>preclude listening to a monologue - or to watching spectral pictures 
>on a display.  But anything more than about 1/5 sec is doomed to 
>feel like Skype on a bad day - where you often end up having to say 
>"over".  As a generality, am I missing something fundamental here?  Peter G3XJP
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