[hpsdr] Alex update?

[Henry Vredegoor]

Hi Scotty, Graham, All,

I have a few technical questions about the changes for Alex; could you 
please explain a little bit more?

- I understand that the currently used cores are manufactured in China, 
a lower price beïng the main reason for doing so, but that they 
initially did not meet the quality standards of TAPR; where/why more 
exactly didn't they meet the spec?
- The circuits of the filters had to be changed to accommodate the China 
manufactured cores.
   Are the quality or spec's  of the filters on the Alex boards 
compromised by this change and if yes what are the resulting 
differences/new specs/consquences?
- Would it still be possible to use the original cores (for maybe better 
quality or  tighter specs) ?

I hope I am not bugging you too much with my questions, I highly 
appreciate the outstanding job you are doing for us all.
But "Ham-Radio minds" want to know.......................    :-)

73's,

Henry.



Scott Cowling schreef:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi Pete,
>
> You can probably put the screws back into your Pandora, but not for long.
>
> Here is the latest on Alex:
>
> Testing and qualification of the toroids has been completed. Thanks to 
> Graham KE9H, John N8UR and Tom N8ZM.
>
> The toroid manufacturing is now in progress. Thanks to Phil VK6APH for 
> helping move this along.
>
> Graham has done (and is still doing) lots of testing to arrive at the 
> final component values for the production boards. The artwork has been 
> changed slightly due to some circuit changes required by the toroid 
> core permeability changes from the original core material.
>
> When the manufactured toroids arrive, we will build a pilot board set 
> with all of the new component values and the new PCB. This board set 
> will be tested prior to the commencement of the build.
>
> The PCBs and any other long lead time items are in the procurement 
> phase. The remainder of the parts are just too expensive to purchase 
> in advance, but will be purchased as soon as we open the TAPR order page.
>
> So you see, we *are* going to build Alex!  But when?
>
> My original target was before Dayton. (OK, the *latest* target. :-)
>
> However, Dayton is only 10 weeks away, so I doubt that this will all 
> happen before May 14. But it won't be too much later than that.
>
> Due to the difficulty of getting correct toroids, we will not open the 
> order page until I have them in my hands and they have been tested. I 
> cannot give you a hard date for that event just yet. :-)  Once I have 
> them, the TAPR order page will be opened and I will have a firm 
> delivery schedule.
>
> I *really* would like to at least have the order page open before 
> Dayton on May 14, 2010. (Notice that I included the year, just in case 
> some people are skeptical.)
>
> Sorry that this has taken so long, but I think there is light at the 
> end of the tunnel. And hopefully it is not an oncoming train. :-)
>
> 73,
> Scotty WA2DFI
>
>
> At 17:25 2010-03-04 -0500, n3evl wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> It seems ages since there was any update on the status of Alex and 
>> the problematic toroids.  The web/wiki/hamsdr.com are all way out of 
>> date now.
>>
>> I'd really like to know if there's been any progress in resolving the 
>> issues and what the projected solution(s) and availability date might 
>> be.
>>
>> I'm not pushing for a hasty solution - I appreciate the work being 
>> done on this by the various volunteers - but a status report once in 
>> a while would be greatly appreciated.  I'd also like to factor 
>> potential availability dates into budgeting for other radio purchases 
>> and other important decisions like: should I put all the screws back 
>> in Pandora?
>>
>> Thanks and 73
>>
>> Pete, N3EVL
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