US3854094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystal controlled, frequency modulated transmitter
Assignee: Relm Communications Inc
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Filing: 1972-11-01
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Granted: 1974-12-10
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Expires: 1992-11-01
Abstract
Abstract A frequency modulated transmitter for use at frequencies from 25 to 54 MHz is disclosed. The crystals in the transmitter oscillate at their fundamental frequency, and this frequency is divided by four to produce a lower frequency which is then modulated. This lower modulated carrier frequency is then multiplied by 24 to produce an output frequency in the desired range.
Inventors
- 👤 J Towler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:38
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/02; H03C3/06
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
153 words
A frequency modulated transmitter which comprises: a. oscillator means which includes: 1. a plurality of crystals having a fundamental frequency of oscillation between 5 to 20 MHz, 2. switch means for selecting any one of said crystals for use in controlling the output frequency of the transmitter, and 3. means for causing said selected crystal to oscillate and for produCing a first carrier at the fundamental frequency of the crystal; b. frequency dividing means to divide said first carrier by an integer greater than 1 to produce a second carrier; c. means for converting audible sounds into an electrical audio signal; d. modulation means for frequency modulating said second carrier in response to said audio signal whereby a first modulated carrier is produced; and e. frequency multiplying means for multiplying said first modulated carrier by an integer greater than 3 whereby a second modulated carrier is produced for the output of the transmitter.
Claim 2
Dependent Claim
153 words
A frequency modulated transmitter which comprises: a. oscillator means which includes: 1. a plurality of crystals having a fundamental frequency of oscillation between 5 to 20 MHz, 2. switch means for selecting any one of said crystals for use in controlling the output frequency of the transmitter, and 3. means for causing said selected crystal to oscillate and for produCing a first carrier at the fundamental frequency of the crystal; b. frequency dividing means to divide said first carrier by an integer greater than 1 to produce a second carrier; c. means for converting audible sounds into an electrical audio signal; d. modulation means for frequency modulating said second carrier in response to said audio signal whereby a first modulated carrier is produced; and e. frequency multiplying means for multiplying said first modulated carrier by an integer greater than 3 whereby a second modulated carrier is produced for the output of the transmitter.
Claim 3
Dependent Claim
125 words
switch means for selecting any one of said crystals for use in controlling the output frequency of the transmitter, and 3. means for causing said selected crystal to oscillate and for produCing a first carrier at the fundamental frequency of the crystal; b. frequency dividing means to divide said first carrier by an integer greater than 1 to produce a second carrier; c. means for converting audible sounds into an electrical audio signal; d. modulation means for frequency modulating said second carrier in response to said audio signal whereby a first modulated carrier is produced; and e. frequency multiplying means for multiplying said first modulated carrier by an integer greater than 3 whereby a second modulated carrier is produced for the output of the transmitter.
Claim 4
Dependent Claim
125 words
switch means for selecting any one of said crystals for use in controlling the output frequency of the transmitter, and 3. means for causing said selected crystal to oscillate and for produCing a first carrier at the fundamental frequency of the crystal; b. frequency dividing means to divide said first carrier by an integer greater than 1 to produce a second carrier; c. means for converting audible sounds into an electrical audio signal; d. modulation means for frequency modulating said second carrier in response to said audio signal whereby a first modulated carrier is produced; and e. frequency multiplying means for multiplying said first modulated carrier by an integer greater than 3 whereby a second modulated carrier is produced for the output of the transmitter.
Claim 5
Dependent Claim
18 words
The transmitter of claim 1 in which said frequency dividing means divides by an integer greater than 3.
Claim 6
Dependent Claim
20 words
switch means for selecting any one of said crystals for use in controlling the output frequency of the transmitter, and
Claim 7
Dependent Claim
20 words
switch means for selecting any one of said crystals for use in controlling the output frequency of the transmitter, and
Claim 8
Dependent Claim
115 words
means for causing said crystal to oscillate and for producing a first carrier at the fundamental frequency of the crystal; b. frequency dividing means to divide said first carrier by an integer greater than 1 to produce a second carrier; c. means for converting audible sounds into an electrical audio signal; d. modulation means for frequency modulating said second carrier in response to said audio signal whereby a first modulated carrier is produced; e. frequency multiplying means for multiplying said first modulated carrier by an integer greater than 3 whereby a second modulated carrier is produced; and f. an antenna connected to the output of said frequency multiplying means for radiatinG said second modulated carrier.
Claim 9
Dependent Claim
115 words
means for causing said crystal to oscillate and for producing a first carrier at the fundamental frequency of the crystal; b. frequency dividing means to divide said first carrier by an integer greater than 1 to produce a second carrier; c. means for converting audible sounds into an electrical audio signal; d. modulation means for frequency modulating said second carrier in response to said audio signal whereby a first modulated carrier is produced; e. frequency multiplying means for multiplying said first modulated carrier by an integer greater than 3 whereby a second modulated carrier is produced; and f. an antenna connected to the output of said frequency multiplying means for radiatinG said second modulated carrier.
Claim 10
Dependent Claim
105 words
means for causing said selected crystal to oscillate and for producing a first carrier at the fundamental frequency of the crystal; b. frequency dividing means to divide said first carrier by an integer greater than 1 to produce a second carrier; c. means for converting audible sounds into an electrical audio signal; d. modulation means for frequency modulating said second carrier in response to said audio signal whereby a first modulated carrier is produced; and e. frequency multiplying means for multiplying said first modulated carrier by an integer having a value which produces a second modulated carrier at a frequency from 25 to 54 MHz.
Claim 11
Dependent Claim
105 words
means for causing said selected crystal to oscillate and for producing a first carrier at the fundamental frequency of the crystal; b. frequency dividing means to divide said first carrier by an integer greater than 1 to produce a second carrier; c. means for converting audible sounds into an electrical audio signal; d. modulation means for frequency modulating said second carrier in response to said audio signal whereby a first modulated carrier is produced; and e. frequency multiplying means for multiplying said first modulated carrier by an integer having a value which produces a second modulated carrier at a frequency from 25 to 54 MHz.
Claim 12
Dependent Claim
14 words
The transmitter of claim 2 in which said frequency dividing means divided by four.
Claim 13
Dependent Claim
21 words
The transmitter of claim 1 in which said frequency dividing means includes a digital counting circuit to divide said first carrier.
Claim 14
Dependent Claim
15 words
The transmitter of claim 4 in which said digital counting circuit includes two flip-flop circuits.
Claim 15
Dependent Claim
18 words
The transmitter of claim 1 in which said frequency multiplying means multiples by an integer greater than 7.
Claim 16
Dependent Claim
14 words
The transmitter of claim 6 in which said frequency multiplying means multiplies by 24.
Claim 17
Dependent Claim
34 words
The transmitter of claim 1 in which said frequency multiplying means multiplies by an integer having a value which causes said second modulated carrier to be at a frequency from 25 to 54 MHz.
Claim 18
Dependent Claim
19 words
The transmitter of claim 1 in which said plurality of crystals have fundamental frequencies between 8 and 16 MHz.
Claim 19
Dependent Claim
22 words
A compact multi-frequency, frequency modulated transmitter for use at frequencies from 25 to 54 MHz which comprises: a. oscillator means which includes:
Claim 20
Dependent Claim
22 words
A compact multi-frequency, frequency modulated transmitter for use at frequencies from 25 to 54 MHz which comprises: a. oscillator means which includes:
Claim 21
Dependent Claim
21 words
The transmitter of claim 10 in which said frequency dividing means includes a digital counting circuit to divide said first carrier.
Claim 22
Dependent Claim
15 words
The transmitter of claim 11 in which said digital counting circuit includes two flip-flop circuits.
Claim 23
Dependent Claim
11 words
A frequency modulated transmitter which comprises: a. oscillator means which includes:
Claim 24
Dependent Claim
11 words
A frequency modulated transmitter which comprises: a. oscillator means which includes:
Claim 25
Dependent Claim
21 words
The transmitter of claim 13 in which said frequency dividing means includes a digital counting circuit to divide said first carrier.
Claim 26
Dependent Claim
15 words
The transmitter of claim 14 in which said digital counting circuit includes two flip-flop circuits.
Claim 27
Dependent Claim
15 words
The transmitter of claim 13 in which the crystal is between 8 and 16 MHz.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |