GB1307888A - Amplifying and repeating circuit for angle modulated signals - Google Patents
Amplifying and repeating circuit for angle modulated signalsInfo
- Publication number
- GB1307888A GB1307888A GB2309770A GB2309770A GB1307888A GB 1307888 A GB1307888 A GB 1307888A GB 2309770 A GB2309770 A GB 2309770A GB 2309770 A GB2309770 A GB 2309770A GB 1307888 A GB1307888 A GB 1307888A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- frequency
- oscillator
- control
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C3/00—Angle modulation
- H03C3/02—Details
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
- H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
- H03D3/24—Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits
- H03D3/241—Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits the oscillator being part of a phase locked loop
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/04—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers
- H03F1/06—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers to raise the efficiency of amplifying modulated radio frequency waves; to raise the efficiency of amplifiers acting also as modulators
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
- H03F1/345—Negative-feedback-circuit arrangements with or without positive feedback using hybrid or directional couplers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/165—Ground-based stations employing angle modulation
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
- Radio Relay Systems (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
1307888 Radio signalling; angle modulated signal repeaters TELETTRA LABORATORI DI TELEFONIA ELETTRONICA E RADIO SpA 13 May 1970 [23 May 1969] 23097/70 Headings H3A H3R and H4L A phase-locked loop is used as a repeater for an F.M. signal. A received F.M. signal s(t) is mixed with the output signal u 2 (t), derived from the constant power output of oscillator 3, in multiplier 1, to produce an error signal which is fed back to lock the oscillator frequency to that of the received signal. The output signal u 1 (t), which follows the frequency variations of the received signal is taken from power divider 4. The control signal may be applied to the oscillator over control paths 2<SP>1</SP>, 2<SP>11</SP> having different cut-off frequencies to provide separate control of the mean frequency. Alternatively, Fig. 4 (not shown), a second control for the oscillator may be provided from a power divider (9) in the received signal path. The loop control signal m(t) represents the demodulated signal. For use as a repeater where a different output frequency is required, a frequency changer (5, 6) is included between the mixer 1 and divider 4, Fig. 2 (not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT5196369 | 1969-05-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1307888A true GB1307888A (en) | 1973-02-21 |
Family
ID=11276093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2309770A Expired GB1307888A (en) | 1969-05-23 | 1970-05-13 | Amplifying and repeating circuit for angle modulated signals |
Country Status (6)
| Country | Link |
|---|---|
| AU (1) | AU1515870A (en) |
| DE (1) | DE2023809A1 (en) |
| ES (1) | ES379900A1 (en) |
| FR (1) | FR2053904A5 (en) |
| GB (1) | GB1307888A (en) |
| NL (1) | NL7007520A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2239996A (en) * | 1990-01-12 | 1991-07-17 | Technophone Ltd | Booster for a portable radio transmitter |
| EP0503416A1 (en) * | 1991-03-08 | 1992-09-16 | Alcatel Espace | Phase locked loop demodulator |
-
1970
- 1970-05-13 GB GB2309770A patent/GB1307888A/en not_active Expired
- 1970-05-15 AU AU15158/70A patent/AU1515870A/en not_active Expired
- 1970-05-15 DE DE19702023809 patent/DE2023809A1/en active Pending
- 1970-05-21 ES ES379900A patent/ES379900A1/en not_active Expired
- 1970-05-22 FR FR7018735A patent/FR2053904A5/fr not_active Expired
- 1970-05-25 NL NL7007520A patent/NL7007520A/xx unknown
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2239996A (en) * | 1990-01-12 | 1991-07-17 | Technophone Ltd | Booster for a portable radio transmitter |
| GB2239996B (en) * | 1990-01-12 | 1994-08-17 | Technophone Ltd | Booster for a portable radio telephone |
| EP0503416A1 (en) * | 1991-03-08 | 1992-09-16 | Alcatel Espace | Phase locked loop demodulator |
| US5204634A (en) * | 1991-03-08 | 1993-04-20 | Alcatel Espace | Phase-locked loop demodulator having loop filter controlled by lock detector |
Also Published As
| Publication number | Publication date |
|---|---|
| ES379900A1 (en) | 1973-04-16 |
| NL7007520A (en) | 1970-11-25 |
| DE2023809A1 (en) | 1971-01-07 |
| AU1515870A (en) | 1971-11-18 |
| FR2053904A5 (en) | 1971-04-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |