[hpsdr] USB vs Ethernet

[George Byrkit]

Dear Luke,
So if your Magister card is working, as long as your system does not change, it should
continue to work the same.  Changing the base platform (computer board) or OS could
introduce a USB driver stack that is less performant, causing drop-outs either on receive
or transmit.  Some of these can be mitigated by playing around with buffer sizes and the
like, as mentioned on other emails on this forum.  The issue with CW break-in in PowerSDR
seems to be something that has been noted on this forum, I think.  It could have come in a
recent version due to code changes or firmware changes, possibly due to changes in
methodology to do CW.  Joe would have to speak to that.

Metis would offer the ability to move more data, for sure.  That might allow for more
timely (better) CW break-in operation.  But I'm not a CW guy, so I'm going on what I seem
to remember, which could be wrong (YMMV).

We are quite sure that the Ethernet stack is indeed more performant (less latency, able to
move lots of data better) than USB.  USB3 may make things better, but Ozy/Magister are USB
2 devices, so that won't help.  Also, not all USB3 ports/hubs are well implemented.

73,
George K9TRV

-----Original Message-----
From: Hpsdr [mailto:hpsdr-bounces at lists.openhpsdr.org] On Behalf Of List Mail
Sent: Friday, January 29, 2016 8:49 PM
To: hpsdr at lists.openhpsdr.org
Subject: [hpsdr] USB vs Ethernet

***** High Performance Software Defined Radio Discussion List *****

OpenHPSDR evolved from USB2 to Ethernet interface for good reasons, I'm 
sure, but will I gain any advantage to toss my Magister card and replace it 
with a Metis card?

My Atlas-based system works as I require it, apart from a CW T/R switching 
problem that appeared when I installed later versions of PowerSDR (which 
also crashes from time to time, but that could be any number of issues).

I use my HPSDR daily for working DX, mostly in CW. I like to use the second 
receiver instance to listen in the split, to target my calling frequency.

If I were to use Metis, might my CW T/R switching be resolved? What other 
improvements might I expect?

With the Aussie dollar being now worth about two bob, I have no desire to 
purchase a new transceiver.

73,
Luke VK3HJ 

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