[hpsdr] Hermes

[Phil Harman]

Hi Rob,

I don't think we will have enough FPGA pins to have both options.

73's Phil...


> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi Phil,
>
> I vote for ethernet as well, but I'm wondering how much it would add to
> the complexity and cost to leave the USB interface on there as well.
>
> 73,
>
> Rob, KL7NA
>
> On 08/04/2010 07:18 PM, David McQuate wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> I vote for Ethernet.  (I believe I heard you had a way of loading the
>> FPGA over Ethernet. True?)
>> 73,
>> Dave
>>
>> Phil Harman wrote:
>>> ***** High Performance Software Defined Radio Discussion List *****
>>>
>>> All,
>>>
>>> Having completed the Beta testing of Hermes we are now preparing to
>>> make
>>> the necessary changes to bring the board into a production ready state.
>>>
>>> There are quite a few changes which are mainly due to the fact we
>>> want to
>>> ensure the product lives up to the 'High Performance' name tag.
>>>
>>> One of the changes is to replace one of the high current linear
>>> regulators
>>> with a SMPSU. We are fortunate to have Kjell, LA2NI,  on our design
>>> team.
>>> Kjell has designed a high frequency SMPSU that works well when
>>> incorporated on the Hermes PCB and does not introduce significant
>>> spurs. This substantially reduces the current drain and also the heat
>>> dissipation.
>>>
>>> The other potential change is this.  I have this week build a prototype
>>> OzyII Gigabit Ethernet board. It works very well and I'm impressed with
>>> how rugged Ethernet appears to be in comparison to USB and Firewire.
>>>
>>> We therefore have the opportunity to replace the USB interface on
>>> Hermes
>>> with Ethernet.  There are a number of advantages in doing this:
>>>
>>> - we overcome the USB driver issues when using different operating
>>> systems
>>> - we can 'network attach' Hermes
>>> - we will have a very high speed interface to the board for future
>>> features
>>> - we can use a much longer Ethernet cable than USB allows
>>>
>>> the disadvantages
>>>
>>> - it may need more that one spin of the PCB which will delay the
>>> delivery
>>> - we will use approximately 10% of the FPGA to implement the Ethernet
>>> interface.
>>>
>>> I'm not too concerned about using more of the FPGA since the device
>>> we are
>>> using is 70% larger than that used on Mercury.
>>>
>>> So "to USB or not to USB - that is the question"?
>>>
>>> 73's Phil...VK6APH
>>>
>>>
>>>
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>>
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> --
> Rob Frohne, Ph.D., P.E.
> E.F. Cross School of Engineering
> Walla Walla University
> 100 SW 4th Street
> College Place, WA 99324
> (509) 527-2075			 http://people.wallawalla.edu/~rob.frohne
>
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