[hpsdr] Cyclops project review

[Phil Harman]

Hi Mike,

Cyclops at present is intended to be board that plugs into the Atlas bus. 
To use it with Hermes it really depends on how many I/O pins are going to be 
needed. If we can reduce this to some from of serial bus (I2C or SPI) then 
its possible.

It could be used as a VHF/UHF down converter but would need suitable filters 
at the input to reduce any image signals.  With the highest IF of 55MHz the 
70cm filters would need to be quite well designed. The phase noise is not 
going to be as good as a well designed converter based on a crystal LO.

73 Phil...VK6APH


----- Original Message ----- 
From: "Mike" <coolgreenearth at gmail.com>
To: <hpsdr at lists.openhpsdr.org>
Sent: Sunday, January 08, 2012 12:39 AM
Subject: Re: [hpsdr] Cyclops project review


> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi Phil,
>
> Will Cyclops be compatible with Hermes?
> Can it be used as a VHF / UHF downconverter / receiver for Hermes?
> Thanks.
> -Mike
>
>
>
> On Jan 7, 2012, at 6:21 AM, Phil Harman wrote:
>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Whilst the prototype Cyclops 1GHz spectrum analyser boards are working 
>> quite well, over the Christmas break I undertook a review of the project 
>> to see if there were any new, or alternative, approaches we could take 
>> before committing to further development.
>>
>> I did some experiments that are documented on the Wiki and it would 
>> appear that there may be an alternative, simpler, architecture that has a 
>> number of advantages over the current design but also some potential 
>> dissadvantages.
>>
>> The write-up on the Wiki explains in some detail what is proposed. It's 
>> possible that others have already tried this approach and perhaps come 
>> across issues that I've not thought of so I'd appreciate comments from 
>> the membership.
>>
>> The Wiki write up is at 
>> http://openhpsdr.org/wiki/index.php?title=CYCLOPS
>>
>> Comments, feedback, suggestions etc. are most welcome.
>>
>> Thanks
>>
>> 73 Phil...VK6APH
>>
>>
>>
>>
>>
>>
>>
>>
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