Shigeo Yamase, JA7UHV

**Summary:
One of the sixth order
PSN (Phase Shift Network)'s has been optimized.
It has the following characteristics: the 6th order, 90 plus minus 0.750
degrees, and fh/fl = 44.17766746. The fh/fl is a ratio of the highest to
the lowest in frequency where phase differece of the psn is maintained
within 90 plus minus 0.750 degrees. The undesired sideband suppression ratio is -43.7 dB at each
of the frequencies with the maximum phase deviation of 0.750 degrees from 90
degrees between fh and fl.
The average suppression of the undesired
sideband over the bandwidth of modulating frequencies between fh and fl is 6.4
dB better than the suppression at each of the above frequencies.**

Table 1

Nr |
Phase Deviationfrom 90 degrees |
Normalized Frequency |
Example 1.Frequency in Hz |

1 |
-0.750 |
fl = 0.1504522230 |
Fl = fl*F0 = 90.27 |

2 |
0.000 |
0.1646530906 |
98.79 |

3 |
+0.750 |
0.2099292534 |
126.0 |

4 |
0.000 |
0.2947908841 |
176.9 |

5 |
-0.750 |
0.4351162990 |
261.1 |

6 |
0.000 |
0.6568709219 |
394.1 |

7 |
+0.750 |
1.000000000 |
F0 = 600.0 |

8 |
0.000 |
1.522369109 |
913.4 |

9 |
-0.750 |
2.298236132 |
1379 |

10 |
0.000 |
3.392235153 |
2035 |

11 |
+0.750 |
4.763509535 |
2858 |

12 |
0.000 |
6.073375217 |
3644 |

13 |
-0.750 |
fh = 6.646628278 |
Fh = fh*F0 = 3988 |

Figure 1. Differential phase-shift characteristics of the network

The graph has a twofold symmetry, of which the axis is

on a normalized frequency of 1. So the left half of the graph

is the same as the right half with respect to the axis, as in a mirror.

Figure 1-2. Undesired Sideband Suppression Ratio Characteristic of the network

The graph has a twofold symmetry.

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Copyright (C) 2004 - 2016 @Shigeo Yamase JA7UHV

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