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Re: [Discuss-gnuradio] High noise level reading GSM spectrum.

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] High noise level reading GSM spectrum.
Date: Wed, 04 Feb 2009 16:54:25 -0500
User-agent: Thunderbird (X11/20081119)

Matt Ettus wrote:
> There is no low pass filter.  Assuming that you are setting the gain
> properly, then most likely problem is that you blew out the LNA in the
> front, U4.  Static or strong signals can do that.  You could try
> replacing U4, which is an MGA82563.
> Matt
Matt, I thought that there *was* an LPF on the I and Q channels on the
MAX2118, which is what set_bw() is all about.
  The MAX2118 has programmable lowpass filters on the I and Q outputs,
does it not?

Marcus Leech
Principal Investigator, Shirleys Bay Radio Astronomy Consortium

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