Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Patent
1979-03-23
1982-01-12
Ng, Jin F.
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
455 89, 455 90, H01B 138
Patent
active
043109233
ABSTRACT:
A two-way business-band transceiver for operation on an assigned FCC frequency includes a chassis housing a plurality of printed circuit boards which are surrounded by a three-part enclosure. This enclosure includes a main body portion having a top half and a bottom half and a control head portion which is separable from the main body portion. The transceiver circuitry which is arranged both within the main body portion as well as within the control head portion includes frequency synthesizing means which are selectable yet nonaccessible from the front of the control head portion. Frequency selection is accomplished by gaining access to a programming circuit portion which is located within the control head portion. This programming circuit portion includes a plurality of 10-position, rotary BCD switches which are arranged for channel 1 and channel 2 operation. By means of selective jumper placement, the transceiver may be arranged for either low-band operation or high-band operation and with each, an additional set of jumpers may be arranged for simplex operation or semi-duplex operation. The 100-MHz digit is preset at 1 and the 10-MHz digit is preset at 5 for each frequency setting, whether low band or high band, and for high-band operation, there is a 10.7-MHz offset factor which is effectively added to the switch setting for high-band operation. The frequency selection switches are not accessible by means of front panel controls and this prevents inadvertent frequency change yet the circuitry still provides the benefits of frequency synthesizing.
REFERENCES:
patent: 2731555 (1956-01-01), Beck
patent: 2935606 (1960-05-01), Harrison
patent: 3175191 (1965-03-01), Cohn
patent: 3487311 (1969-12-01), Luhowy
patent: 3970782 (1976-07-01), Fenne
patent: 3983484 (1976-09-01), Hodama
patent: 4027242 (1977-05-01), Yamanaka
patent: 4034164 (1977-07-01), Westmoland
patent: 4061973 (1977-12-01), Reimers et al.
patent: 4070626 (1978-01-01), Binder
patent: 4134070 (1979-01-01), Henderson et al.
CQ Reviews: The Kenwood TS-820 Transceiver, by H. Paul, CQ Radio, Feb., 1977, pp. 23-25 and 74, vol. 22, No. 2.
Chin Tommy P.
General Aviation Electronics, Inc.
Ng Jin F.
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