[hpsdr] Call for Comments and Discussion - CYCLOPS

[Graham / KE9H]

Bill:

I think the limitation on the bandwidth of the 1.6 MHz wide SAW filter 
is due to
a limited selection of off-the-shelf components.  I think Phil's 
original plan
was to scan the desired spectrum in 2 MHz steps by moving the High-LO
and doing the finer processing in software.  This filter will probably 
require
scanning in 1 MHz steps, or maybe 1.5 MHz steps.

--- Graham

==

Bill Tracey wrote:
> Cyclops diagram and schems looks good to me so far.    A question - at 
> the risk of confirming myself as more a software person than a radio 
> person.... why the relatively narrow 1.6 MHz filter in front of the 
> output on Cyclops?    Would it not be better to let a wider swath into 
> Mercury  - the FPGA code can always filter out what we don't want .. 
> seems in an SDR solution one would want to allow as wide a swath in as 
> you can and let the firmware/software filter where needed.
>
> Regards,
>
> Bill  (kd5tfd)
>
>
> At 04:54 PM 7/11/2009, Graham / KE9H wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> All:
>>
>> An information package has been posted to the Wiki on the
>> CYCLOPS page, under the "July 11 Update" heading, with
>> block diagram, schematics and a proposed PCB layout for
>> a prototype CYCLOPS spectrum analyzer card.
>>
>> The Tracking generator will likely be a separate card developed
>> after the main SA receiver card is running.
>>
>> Please review the package and direct questions, comments,
>> constructive criticism, etc to Phil, VK6APH or myself. Phil is the
>> project leader and designer.  I have been assisting Phil with
>> the PCB layout, bill of materials and sourcing.
>>
>> --- Graham / KE9H
>
>
>
>



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