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Re: [Discuss-gnuradio] cable modem tuner now integrated

From: Steve Schear
Subject: Re: [Discuss-gnuradio] cable modem tuner now integrated
Date: Sun, 25 Nov 2001 17:21:27 -0800

At 03:25 PM 11/25/2001 -0800, you wrote:
Hi Folks,

I've now got a very nice cable modem tuner module (eval board) hooked
into GNU Radio.  From a hardware point of view it was a zero glue
operation.  Just a couple of cables and rigging up a power supply.

FYI, it's a Microtune 4937DI5 3x7702 module.  Tunes from 50M to 860M
and has about a 6MHz wide IF centered at 5.75M.  Very convenient for
our 20M sample A/D board.  Cables right up.  You control it by bit
banging it over the parallel port.  It has a I2C interface plus a few
additional bits.

I've attached some FFT graphs from various parts of the spectrum.
Lots of good stuff to work with.  The center of the IF is indicated at
5.75MHz.  The displayed frequency axis values don't currently take

Kudos!  A major step forward.

When I first came across these I had some reservations regarding their dynamic range. Have you or do you have plans to determine if this is likely to be a problem for the sorts of broadband signals of interest?


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