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Re: [Discuss-gnuradio] Re: usrp wfm problem

From: Marcus Leech
Subject: Re: [Discuss-gnuradio] Re: usrp wfm problem
Date: Wed, 16 Feb 2005 13:49:53 -0500
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4) Gecko/20030624 Netscape/7.1

It would be useful to have a function that returned the as-aliased frequency for
 any given input frequency (up to the maximum input frequency of the A/D).
 Trivial, I suppose, but less opportunity for brain farts that way.

Matt Ettus wrote:

Quoting mj <address@hidden>:

Am i missing something obvious?

Fixed it. the "freq1 = blah * 1e6" evaded me.

Still not sure on how to receive 433Mhz if anyone

As RF frequency rises from 0 to 32 MHz, the "digital" frequency goes from 0 to
32 MHz.  As RF frequency goes from 32 to 64, digital frequency goes back down
to 0.  It the repeats from there.

So you can receive 433.0 MHz at:

433 - (6*64) = 49 MHz.

433 appears where 49 would

49-32 = 17.

32 - 17 = 15 MHz

So tune to 15 MHz to hear 433.

This will all be much easier once there are proper RF sections available.


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