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Re: [Discuss-gnuradio] Re: Residual Frequency?

From: Johnathan Corgan
Subject: Re: [Discuss-gnuradio] Re: Residual Frequency?
Date: Mon, 21 Apr 2008 21:41:36 -0700

On Mon, Apr 21, 2008 at 5:06 PM, Brian Padalino <address@hidden> wrote:

>   a) Should the compression of the output stages really affect his
>  constant envelope GMSK signal?

Not directly.  However, by operating a normally linear amplifier in
gain compression, the third-order mixing products of the signal and
any spurs and noise will be disproportionately higher than if the
amplifier were run in its linear range.

>   b) Is there any future enhancement scheduled to feed the
>  daughterboard a normalized signal with a "backoff" in dB which will
>  try to ensure linearity?

Well, not this specifically.  It would be a matter of calibration
anyway, as the 1dB gain compression point of the output stages would
likely be different from board to board.

We're of course open to suggestions.

Johnathan Corgan
Corgan Enterprises LLC

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