Two-way transceiver including frequency synthesizer
First Claim
1. A two-way business-band transceiver, comprising:
- a transceiver housing enclosing a transceiver circuit,a separable control head portion integral with the housing and containing controls including a channel-select switch with an external select knob for selecting one of a plural number of channels each having a plural digit frequency,a set of plural individually adjustable frequency selection elements for each channel frequency, each of which controls the value of a different digit of that frequency,the adjustable frequency selection elements being disposed within the control head portion of the housing and being inaccessible from outside the housing, the elements being positioned therein for convenient adjustment of their digit values to provide an internal adjustable multi-frequency changing capability for the external manual channel-select switch,the transceiver circuit including a high-band frequency offset circuit means for providing an incremental frequency change from a first frequency setting located in the low-band range to a setting in the high-band frequency range.
0 Assignments
0 Petitions
Accused Products
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.
39 Citations
10 Claims
-
1. A two-way business-band transceiver, comprising:
-
a transceiver housing enclosing a transceiver circuit, a separable control head portion integral with the housing and containing controls including a channel-select switch with an external select knob for selecting one of a plural number of channels each having a plural digit frequency, a set of plural individually adjustable frequency selection elements for each channel frequency, each of which controls the value of a different digit of that frequency, the adjustable frequency selection elements being disposed within the control head portion of the housing and being inaccessible from outside the housing, the elements being positioned therein for convenient adjustment of their digit values to provide an internal adjustable multi-frequency changing capability for the external manual channel-select switch, the transceiver circuit including a high-band frequency offset circuit means for providing an incremental frequency change from a first frequency setting located in the low-band range to a setting in the high-band frequency range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
Specification