[hpsdr] wiki - HERMES

Kevin Wheatley m0khz at tiscali.co.uk
Mon May 25 08:21:45 PDT 2009


Hi Henry

On 25 May 2009, at 16:11, Henry Vredegoor wrote:

> Hi Richard, Kevin,
>
> Richard, I think you are doing a wonderful job for the Wiki pages.
> I read the Wiki page about Hermes and I think that collecting the  
> various
> comments and design decisions and keeping them at a single place is  
> a very
> good idea!
>
> Kevin, my thoughts on Hermes:
>
> Form factor / Casing:
>
> I think one of the aims of creating Hermes in the first place was to  
> have a
> kind of "stand-alone", compact, Penny/Mercury/Ozy setup?
> So not the Atlas-bus interface and -connector requirements/overhead.
>
Yes this is correct.

> Then why stick to the default form-factor of Atlas/HPSDR (Eurocard)  
> board
> size of 200 X 100 mm. ?
> For a stand alone and "mobile" use, maybe a different form factor  
> could be a
> better choice?
>
> What about a mini-ATX form-factor of 170 X 170 mm.?
> This could possibly make using (mobile/Car) mATX-PC casings and  
> 12(13.8)
> Volt PSU's etc. a nice and cheap(-er) option.
> This slightly bigger size could also provide some extra space  
> required for
> the small PA idea.
> A companion mATX-PC (e.g. An Intel Atom based mATX-PC board) in the  
> same
> type casing would make a nice set.
>

This idea of migrating to a 170x170 definitely has some merit, the  
extra space will be helpful.
I'll do some research while considering this idea.

> Mobile/remote use:
>
> It would be nice for mobile/remote use if the power supply input  
> voltage
> range could be extended to say from as low as 10-11 Volts and up to  
> 14-15
> Volts (typ. 12 Volts)
> This would require some voltage up-conversion for the +12 Volt  
> supply (if
> the input voltage is at its lowest spec voltage of 10-11 Volts)  
> since the +5
> V, +3,3V are probably regulated down from the higher supply input  
> voltage.
>
> Just my 2 cents....
>
>

73's
Kevin

>
> Henry.
>
>
>
>
>
>
>
>> -----Original Message-----
>> From: hpsdr-bounces at lists.openhpsdr.org
>> [mailto:hpsdr-bounces at lists.openhpsdr.org] On Behalf Of Richard Ames
>> Sent: zondag 24 mei 2009 6:34
>> To: Kevin Wheatley
>> Cc: HPSDR list
>> Subject: [hpsdr] wiki - HERMES
>>
>>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Kevin -
>>
>> I have taken the liberty of changing the HERMES wiki page
>> (quite a bit)
>> and moving the discussion to a separate page...  also put recent
>> comments into the discussion page.
>>
>> I hope it is useful....  when the discussion is over it becomes the
>> achieve of the design discussions and can be refered to as
>> history... at
>> the moment interested people are being asked to comment....
>>
>> see: http://openhpsdr.org/wiki/index.php?title=HERMES
>>
>> Regards,
>>
>> Richard.
>>
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>


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