[hpsdr] TeamSpeak audio 2009/Sep/19

[Phil Harman]

Hi Jeremy,

Thanks for the most informative feedback. As I mentioned on the TeamSpeak
session I'm making very good progress with the Ethernet based OzyII board.

I'll provide a more detailed report and update the Wiki shortly.

73's Phil...VK6APH




> ***** High Performance Software Defined Radio Discussion List *****
>
> Just a quick comment on the discussion Phil was having regarding the
> packet size on the PHY on OZY II.  You for sure don't want to be
> sending packets > 1500 bytes across the wire (mini-jumbos or jumbos)
> because much of the consumer grade switching equipment can't handle
> jumbo packets.  Honestly, jumbo support on enterprise and service
> provider equipment is spotty.  My Cisco 12000 series router has jumbo
> issues.  Either that, or you may want to think about having a switch
> to enable jumbos for users that know that they have networking
> equipment that will support it.
>
> The other consideration regarding this is that if you're running
> jumbos on IP, you're going to have people go into their network
> settings to change the MTU on their PC (or Mac's) Ethernet interface
> in order to transmit packets above the default of 1500 bytes.  This
> could cause some issues because you're going to have to have them
> change the MTU on their entire network to support this.  This could
> cause more headaches than you're willing to deal with.
>
> Just some thoughts.
>
> As far as performance of Mercury, which was discussed later.  I saw
> that there are some performance numbers on TAPR's Mercury page, I'm
> not sure if they're at all accurate or where they came from:
>
> 	• ADC overload: -12dBm (preamp on), +8dBm (preamp off)
> 	• MDS (500Hz), 160m - 6m: -138dBm (preamp on), -118dBm (preamp off)
> 	• IP3 equivalent (independent of spacing): +33dBm (preamp on), >
> +50dBm (preamp off)
> 	• BDR (5kHz, 1dB GC): -119dBm (ADC overload limited, not phase noise
> limited)
> 	• 122.88MHz clock phase noise: -149dBc/Hz at 1kHz spacing
>
> http://www.tapr.org/kits_merc.html
>
> --
> Jeremy McDermond (NH6Z)
> Xenotropic Systems
> mcdermj at xenotropic.com
>
>
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