<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">GiG-E. The location benefits themselves may be worth it. Imagine, Hermes on top of the tower...<div>Raj, N2RD</div><div><br><div><div>On Aug 4, 2010, at 10:26 PM, Ray Page wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">***** High Performance Software Defined Radio Discussion List *****<br><br>Gig-E<br><br>-Ray KF5HNK<br><br><br><br><div class="gmail_quote">On Wed, Aug 4, 2010 at 9:06 PM, Phil Harman <span dir="ltr"><<a href="mailto:phil@pharman.org">phil@pharman.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
***** High Performance Software Defined Radio Discussion List *****<br>
<br>
All,<br>
<br>
Having completed the Beta testing of Hermes we are now preparing to make<br>
the necessary changes to bring the board into a production ready state.<br>
<br>
There are quite a few changes which are mainly due to the fact we want to<br>
ensure the product lives up to the 'High Performance' name tag.<br>
<br>
One of the changes is to replace one of the high current linear regulators<br>
with a SMPSU. We are fortunate to have Kjell, LA2NI, on our design team.<br>
Kjell has designed a high frequency SMPSU that works well when<br>
incorporated on the Hermes PCB and does not introduce significant spurs.<br>
This substantially reduces the current drain and also the heat<br>
dissipation.<br>
<br>
The other potential change is this. I have this week build a prototype<br>
OzyII Gigabit Ethernet board. It works very well and I'm impressed with<br>
how rugged Ethernet appears to be in comparison to USB and Firewire.<br>
<br>
We therefore have the opportunity to replace the USB interface on Hermes<br>
with Ethernet. There are a number of advantages in doing this:<br>
<br>
- we overcome the USB driver issues when using different operating systems<br>
- we can 'network attach' Hermes<br>
- we will have a very high speed interface to the board for future features<br>
- we can use a much longer Ethernet cable than USB allows<br>
<br>
the disadvantages<br>
<br>
- it may need more that one spin of the PCB which will delay the delivery<br>
- we will use approximately 10% of the FPGA to implement the Ethernet<br>
interface.<br>
<br>
I'm not too concerned about using more of the FPGA since the device we are<br>
using is 70% larger than that used on Mercury.<br>
<br>
So "to USB or not to USB - that is the question"?<br>
<br>
73's Phil...VK6APH<br>
<br>
<br>
<br>
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