[hpsdr] Mercury Workings

[Tim O'Rourke]

Graham
Could not agree with you more on FB, best receiver, best filtering rig I have ever encountered, and there are 30 or so in shack!
It seems that dynamic range will handle every thing I will incounter and then some.
The filtering is so good you forget you have a narrow band width, the lack of ringing is amazing.
Still learning more each day, tnx to everyone on team! Best Christmas present ever!
Tim W4YN

-----Original Message-----
>From: Graham / KE9H <KE9H at austin.rr.com>
>Sent: Dec 30, 2008 6:01 PM
>To: Tim O'Rourke <w4yn at arrl.net>
>Cc: hpsdr at lists.hpsdr.org
>Subject: Re: [hpsdr] Mercury Workings
>
>Tim:
>
>There are no "traditional" band pass filters in Mercury, in the sense
>lf LC or crystal filters.  The filtering is implemented in software as
>digital filters.  Both in the Mercury FPGA and the PowerSDR software in
>your PC.  Since they are virtual filters implemented as mathematics,
>the filter performance is likely better than anything you have ever used
>before, and better than you could afford to buy in a conventional filter.
>
>As long as the front end A->D converter is not in overload, the
>software filters can take care of everything else.  Overload will occur
>somewhere around 50 milliVolts input with the pre-amp turned on, and
>about 0.5 Volts with the preamp turned off.
>
>--- Graham
>
>
>
>Tim O'Rourke wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Just a general question if someone on list gets a free couple of minutes Hi Hi!
>> How does Mercury handle rejection of out of band signals? I noticed when tuning from ham bands to general coverage the signal level increases, right at edge of band. I am waiting for manual and just curious as I do not see traditional bp filters in block diagram. My guess it is all done with digital filtering. However it works it seems to working FB!
>> Keep the faith and tnx for all the work you do to keep us old geisers interest up! 
>> Tim W4YN
>>
>> Tim O'Rourke 
>> W4YN at ARRL.Net
>> Low Power Amateur Radio Rocks 
>> Member of Flying Pigs,ARCI,GQRP,RSGB,ARRL Life Member
>> NHRA Life Member
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>>   
>
>


Tim O'Rourke 
W4YN at ARRL.Net
Low Power Amateur Radio Rocks 
Member of Flying Pigs,ARCI,GQRP,RSGB,ARRL Life Member
NHRA Life Member

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