[hpsdr] about latency growth with HPSDR

[Riho B., ES7AAZ]

Thanks Phil,

As I see I need to upgrade my hardware. I'm still Ozy user since most
of the time I'm running my HPSDR @ 48 kHz, there's no need for
higher sampling rates for me.


Thanks again !

73's
Riho, ES7AAZ.


1.10.2011 10:14, Phil Harman kirjutas:
> Hi Riho,
> You may care to do some tests on you system using KISS Konsole since I 
> suspect you are dropping packets between the PC and HPSDR hardware.  
> If you are only losing the odd packet then you are not going to hear them.
> The Metis Ethernet code has a packet number included in each data 
> frame both to and from the PC. KK will indicate if a  packet is lost 
> and what the expected and received  packet numbers are.  Similarly 
> Metis will light a LED if it misses a packet.
> Using KK with Metis at 192ksps I have never seen a missed packet in 
> either direction - in fact I had to deliberately send incorrect packet 
> numbers to check the code was working!
> I'm also currently doing some work that involves time stamping the 
> data from Mercury via Metis - again no dropped packets.
> The PC has absolutely no idea what the sample rate is of the data it 
> is being sent. It's not acceptable that an SDR can't be used for DRM, 
> SSTV etc - this needs to be investigated and corrected.
> 73 Phil...VK6APH

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