GNU Radio 3.6.2 C++ API
fpll_btloop_coupling.h
Go to the documentation of this file.
1 /* -*- c++ -*- */
2 /*
3  * Copyright 2002 Free Software Foundation, Inc.
4  *
5  * This file is part of GNU Radio
6  *
7  * GNU Radio is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 3, or (at your option)
10  * any later version.
11  *
12  * GNU Radio is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with GNU Radio; see the file COPYING. If not, write to
19  * the Free Software Foundation, Inc., 51 Franklin Street,
20  * Boston, MA 02110-1301, USA.
21  */
22 #ifndef _FPLL_BTLOOP_COUPLING_H_
23 #define _FPLL_BTLOOP_COUPLING_H_
24 
25 /*!
26  * Magic coupling constant between GrAtscFPLL and GrAtscBitTimingLoop.
27  * Trust me, you don't want to mess with this.
28  *
29  * The agc block buried in the FPLL indirectly sets the level of the input
30  * to the bit timing loop. The bit timing loop's convergence properties
31  * depend on the the mean amplitude of it's input. This constant ties
32  * them together such that you can tweak the input level of the bit timing loop
33  * (somewhat) without screwing everything.
34  */
35 
36 static const float FPLL_BTLOOP_COUPLING_CONST = 3.125;
37 
38 #endif /* _FPLL_BTLOOP_COUPLING_H_ */