[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Discuss-gnuradio] Are microtune 4707's worth having?
From: |
Eric Blossom |
Subject: |
Re: [Discuss-gnuradio] Are microtune 4707's worth having? |
Date: |
Wed, 10 Nov 2004 10:54:05 -0800 |
User-agent: |
Mutt/1.5.6i |
On Wed, Nov 10, 2004 at 02:41:38AM -0500, Tom Huppi wrote:
>
> There are a box of 108pc on e-bay w/ no bids for $50.
>
> I'm sorry for my lack of knowledge. I see more IF info related to
> the 49xx pieces (on microtune's websiite), but one of the USRP
> modules seems to have a 4702.
I sent a message to the seller asking for a data sheet.
I'll let you know what I find out.
> Unrelated general question: If, while I wait for the USRP to
> become available, I work at modifying a cheap radio to provide
> 12khz IF output, will I be able to use the rig for anything of
> interest using currently written code? I've seen a couple of such
> mods seemingly aimed at DRM/soundcard experimenters.
Sound cards have relatively slow A/D's in them, so you're limited to
the bandwidth you handle. SSB or narrow band FM are possible.
> The link to the diagram for a simple downconversion device that I
> found on the GnuRadio website left this newbie with more questions
> than answers....and I can't figure out what a 'haxpertise' is or
> where to find info on it...google draws a blank (saved the
> GnuRadio website :)
I'd translate haxpertise as "hacker expertise" == cluefulness.
Feel free to edit the wiki for clarity ;-)
> Also I have not learned enough to understand
> the relationship between signal transmission frequencies (and
> various modulation types) and the AD sampling rate needed to do
> something usefull with them.
The Nyquist criterion specifies that your sampling rate needs to be at
least 2 times the bandwidth of interest. In reality, a number closer
to 2.5 works better.
If you haven't already, take at look at http://comsec.com/wiki?SuggestedReading
Lots of good sources of information there.
Eric