[hpsdr] Hermes

[Rob Frohne]

Hi Phil,

Have you considered possibly having both circuits on the board, so that 
one or the other could be selected with a set of physical jumpers to 
connect the pins to the USB part or the ethernet part of the circuit?

73,

Rob

On 08/05/2010 08:20 PM, Phil Harman wrote:
> 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
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> HPSDR Discussion List
>>>> To post msg: hpsdr at openhpsdr.org
>>>> Subscription help:
>>>> http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
>>>> HPSDR web page: http://openhpsdr.org
>>>> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/
>>>>
>>>>
>>>>          
>>> _______________________________________________
>>> HPSDR Discussion List
>>> To post msg: hpsdr at openhpsdr.org
>>> Subscription help:
>>> http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
>>> HPSDR web page: http://openhpsdr.org
>>> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/
>>>        
>> --
>> 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
>>
>> _______________________________________________
>> HPSDR Discussion List
>> To post msg: hpsdr at openhpsdr.org
>> Subscription help:
>> http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
>> HPSDR web page: http://openhpsdr.org
>> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/
>>      
>
>    

-- 
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

-------------- next part --------------
A non-text attachment was scrubbed...
Name: rob_frohne.vcf
Type: text/x-vcard
Size: 298 bytes
Desc: not available
URL: <http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/attachments/20100810/9b6d23b6/attachment-0004.vcf>