[hpsdr] FW: Hermes
W2XJ
w2xj at nyc.rr.com
Wed Aug 11 09:27:30 PDT 2010
Sorry for the double post - email fine tuning issue.
On 8/11/10 12:23 PM, "W2XJ" <w2xj at nyc.rr.com> wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Subject: Re: [hpsdr] Hermes
>
> I think at this point USB is just an unnecessary bottleneck to
> experimentation with Hermes. Beyond the complexity of supporting two
> hardware interfaces, the ongoing issue of supporting two sets of drivers for
> software could be a problem. There is not much difference between a limited
> length USB cable between the radio and the computer and an Ethernet
> crossover cable of the same length. On the other hand, Ethernet permits
> wireless connections, fiber optic and wide area connection which will permit
> things previously extremely difficult for the experimenter.
>
>
> On 8/10/10 10:25 PM, "Rob Frohne" <rob.frohne at wallawalla.edu> wrote:
>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Hi Phil,
>>
>> That is more pins than I thought (without looking). I'm still in favor
>> of the Ethernet, but I was trying to make sure that there wasn't an easy
>> solution that would make everyone happy.
>>
>> 73,
>>
>> Rob
>>
>> On 08/10/2010 06:57 PM, Phil Harman wrote:
>>> Hi Rob,
>>>
>>> I will look at that since it would solve the problem of FPGA pins. One
>>> other advantage of the Ethernet solution is that a 125MHz clock is all we
>>> need for the entire board. We would need an additional 24MHz clock for
>>> the USB.
>>>
>>> Jumper selecting some 20+ pins could also be a problem particularly since
>>> the PHY data is at 250MHz.
>>>
>>> I've also had a chance to use the Ethernet connection to HPSDR for a few
>>> days. It is so much nicer than USB. No driver issues, at Gig-E I can
>>> unplug all the cables (with the PC and OyzII still connected) and plug
>>> then back in and it all starts automatically.
>>>
>>> 73's Phil...
>>>
>>>
>>>
>>>
>>>> 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
>>>>>>>>
>>>>>>>>
>>>>>>>>
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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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>>>>>>
>>>>>>
>>>>>
>>>>>
>>>> --
>>>> 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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