Telecommunications – Transmitter and receiver at same station – With tuning
Patent
1992-06-15
1995-04-18
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at same station
With tuning
455125, 4551932, 4551951, 333232, H03J 716, H03L 706
Patent
active
054086884
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method, in mobile telephone systems comprising base stations with a plurality of resonance modules (cavities), for separately adjusting each resonance module to its own frequency for receiving and expediting telephone signals on such frequency, a tuning means in each module being guided to its given resonance mode in relation to the frequency of the incoming signal. The invention also relates to apparatus for carrying out the method, as well as adjusting means for guiding the tuning means.
BACKGROUND OF THE INVENTION
In such mobile telephone systems it is already known to arrange a plurality of resonance modules at the base stations, each of these module being tunable to a specific frequency. In the past, the adjustment of the resonance modules was carried out manually, although systems for automatic adjustment are also known.
SUMMARY OF THE INVENTION
The present invention has the object of improving the automatic adjustment and, inter alia, to cause a part of the switching circuit to function as a selective amplitude detector, with the result that the apparatus will not be responsive to signals from neighboring channels. With the aid of the circuits and the electro-mechanical adjusting means, very rapid setting and fine adjustment of the resonance module is achieved. The rapidity of the setting means is in itself necessary in telephone systems, and was perhaps afforded by earlier known setting means as well, but the setting means in accordance with the present invention is much more reliable than the prior art setting means, and has a long life.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail and with reference to the accompanying drawings in which:
FIG. 1 is a block diagram of units included in the system for the adjustment of the resonance modules.
FIG. 2 is a terminal diagram of three detectors included in the system.
FIG. 3 is a graph of the phase setting.
FIG. 4 is a terminal diagram of the error amplifier.
FIG. 5 is a terminal diagram of the error amplifier signal paths when the transmitter is shut down.
FIG. 6 illustrates the signal paths for the error amplifier during searching.
FIG. 7 is a terminal diagram of the error amplifier signal paths when the system is locked.
FIG. 8 is a terminal diagram for switching logic.
FIG. 9 is a cross-section through a resonance module and adjusting means in accordance within the invention.
FIG. 10 schematically illustrates the system in accordance with the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The method of controlling the setting means for the resonance module in accordance with the invention will first be summarized without specific reference to the drawing figures.
A measuring signal is taken out of either side of the resonance module, one signal being taken out before the module and the other signal after it. Hereinafter the former signal will be designated as "reference signal" and the latter signal as "measuring signal". A first detector senses the signal and delivers a voltage. If the associated antenna is not given any reference signal, no such signal can be applied to the resonance module and there is thus no voltage either. If a reference signal comes to the resonance module, a measuring signal always occurs sooner or later on the other side of the module, and this signal is sent by a second detector. The detector has a control circuit, which is then switched to a search mode, signifying that the module tuning means performs a movement in the module, and an output signal is sent. When the reference signal and the measuring signal have the same phase angle, a maximum potential controlled by the second detector is obtained between two applied voltages. When there is no measuring signal, the applied voltage has no potential difference. A third detector is arranged for measuring the phase difference between the reference signal and the measuring signal, preferably such that either the reference signal or the measurement signal is phase s
REFERENCES:
patent: 3271684 (1966-09-01), Simon
patent: 3293572 (1966-12-01), Smith
patent: 3715690 (1973-02-01), Young et al.
patent: 4097823 (1978-06-01), Jerinic et al.
patent: 4726071 (1988-02-01), Jachowski
Allgon AB
Eisenzopf Reinhard J.
Le Thanh C.
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