[Wormnet] filter design

[mIB]

... if you have multipple swepfilters?

And what was the easy carculation?  I like to know.


----- Original Message ----- 
From: "Peter Steen" <peter.steen at ing-steen.se>
To: "mIB" <marcel.bos at ing-steen.se>
Cc: <wormnet at polarhome.com>
Sent: Wednesday, November 30, 2005 9:31 PM
Subject: Re: [Wormnet] filter design


> Hello folks!
>
> Drop the bandpass fixation!
>
> We have to analyze several hundreds of megahertz in paralell, not sweep it 
> is
> way to slow process, you have to stay to long in each frequecy in order to
> detect carrier and such, at least 5 or ten radians. This way lower 
> frequencies
> is wery slow and higher frequencies faster and faster the higher you get. 
> It
> will take seconds or more to sweep the spectra in classic ways and you 
> will also
> miss all non fix carrier transmissions.
>
> Bit deep is exactly in correspondence with the weakest signal you want to 
> be
> able detect. Modern recievers can catch signals as low as -105 dBm and 
> still
> you recieve many megabits per second. It is easy to do a small calculation
> and see how many bits needed.
>
> Also how should sweeping filter design deal with hopping frequency 
> transmitters
> and direct sequency transmitters which become more and more popular.
>
> No, drop the sweep filters they will not work here.
>
> Regards //
>       //  Peter Steen
>
> Citerar mIB <marcel.bos at ing-steen.se>:
>
>>
>> I am still figuring on this sweaping filter for the digital spectrum
>> analyser.  I have found by mind that the bandpasfilter must be exact
>> one wavelength of the given frequency one listens to so that the data 
>> from
>> this given frequency can be sampled and stored.
>>
>> Whats unclear is the bit deep for the A/D converter for the best silent
>> sampling enviroument..
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
>
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