H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/61
H04B 1/04 (2006.01) G01S 1/04 (2006.01) G01S 1/68 (2006.01) H01Q 1/24 (2006.01) H01Q 9/30 (2006.01) H01Q 9/32 (2006.01)
Patent
CA 2026341
ABSTRACT The invention relates to small low voltage transmitters for transmitting at single frequency, preferably in the VHF range, suitable for use in the location or tracking of birds, animals, vehicles, people or other objects where the transmitter is required to be small and light. The transmitter circuit includes an oscillator stage (61) based on a crystal oscillator XL1 having a predetermined nominal frequency, a frequency multiplying and amplifying circuit (62) arranged to double the nominal frequency and a pulsing circuit (60) designed to give a pulsed output at predetermined frequency, the pulsing stage (60) includes a pair of transistors TR11, TR12 having effective negative resistance, which transistors are separate from the transistor TR3 in the oscillating circuit and which are off during an Off Period and on during an On Period with the Off to On period in the ratio of at least 15 to 1. The oscillator circuit (61) includes a tuning means C3 by which the tolerances of the crystal frequency and other components of the oscillator stage can be compensated. The frequency multiplying and amplifying circuit (62) includes a distinct tuning means (66) by which the final desired frequency of the amplifyer stage can be tuned to compensate the component tolerances in the stage. The transmitter circuit together with batteries (30) are located in a casing (18, 20) all of which components weigh no more than 7 grams.
Hi-Trak Systems Limited
Ridout & Maybee Llp
Van Der Veen Albertus C.
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