Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1991-09-04
1994-05-24
Pascal, Leslie
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359114, 359125, 359191, 359121, H04B 1024, H04J 1402
Patent
active
053154258
ABSTRACT:
Frequency stabilizing in a, for instance star/branched-tree shaped, network can be well executed by locking the frequencies (f1) of the transmitters (T1) in the network center to a common reference frequency source (CFC) and, moreover, per duplex connection, locking (at a fixed frequency distance) the frequency (f2) of the subscriber's transmitter (T2) to the transmission signal (t1) as received from the network center's transmitter (T1). Per duplex connection only the subscriber's local oscillator (L2) has to be tuned so that the transmission signal from the network center is received optimally. If the subscriber's local oscillator is tuned thus and the subscriber transmitter's frequency has the right frequency offset to the tuned local oscillator frequency (f4), at the network center's side, signals from the subscriber's transmitter will be received optimally too if the local oscillator (L1) of the network center's receiver (R1) is set at a certain (predetermined) frequency offset to the signal transmitted to the subscriber's receiver.
Frequency setting, at the network center's side and at the subscriber's side, can be executed by means of auxiliary receivers (R1a,R2a) and AFC-units, generating the various frequency control signals, or by means of the receivers (R1,R2) already in use, provided with multiple pass filters and AFC-units. For achieving relative low IF frequencies, certain frequency orders are preferred.
REFERENCES:
patent: 4489413 (1984-12-01), Richmond
patent: 4685099 (1987-08-01), White
patent: 5077731 (1991-12-01), Omiya
Abstract of Japan, vol. 10, No. 104(E-397)[2161], Apr. 19, 1986; & JP-A-60 242 739 (Nippon Denki) Feb. 12, 1985.
Bekooij Johan P.
van Deventer Mattijs O.
Koninklijke PTT Nederland N.V.
Pascal Leslie
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