GB1507079A - Device for monitoring the quality of radio relay links - Google Patents
Device for monitoring the quality of radio relay linksInfo
- Publication number
- GB1507079A GB1507079A GB26750/75A GB2675075A GB1507079A GB 1507079 A GB1507079 A GB 1507079A GB 26750/75 A GB26750/75 A GB 26750/75A GB 2675075 A GB2675075 A GB 2675075A GB 1507079 A GB1507079 A GB 1507079A
- Authority
- GB
- United Kingdom
- Prior art keywords
- khz
- comparator
- square
- minute
- signal
- 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
- 238000012544 monitoring process Methods 0.000 title abstract 2
- 238000005259 measurement Methods 0.000 abstract 2
- 239000003990 capacitor Substances 0.000 abstract 1
- 238000005316 response function Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/15—Performance testing
- H04B17/18—Monitoring during normal operation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/101—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof
- H04B17/104—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof of other parameters, e.g. DC offset, delay or propagation times
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Measurement Of Current Or Voltage (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
1507079 Testing telecommunications system DE STAAT DER NEDERLANDEN TE DEZEN VERTEGENWOORDIGD DOOR DE DIRECTEURGENERAAL DER POSTERIJEN TELEGRAFIE EN TELEFONIE 24 June 1975 [17 July 1974] 26750/75 Heading G1U In monitoring the quality of a radio relay link, the average noise power/minute and average baseband load/minute are measured and compared to predetermined reference levels, the exceeding of which is signalled. For noise measurement, a filter 3 defines a 7 kHz band about the appropriate frequency (4765 kHz or 4830 kHz for 960 or 1800 channel systems respectively), this signal is mixed with an appropriate local oscillator 5 signal to provide a 65 kHz imput to an i.f. stage 6, providing variable gain (60-100 dB) and noise band width definition (3À1 kHz). To measure instantaneous noise power, integrated square-law generators 11, 12 are used. Since each of these has only 25 dB dynamic range, two alternate channels are provided. At low levels comparator 16 connects resistor 17 to the following integrator 13, such that an amplifier 15 (20 dB) is inserted into the measurement. At levels 20 dB above the minimum input, comparator 16 switches over to resistor 18, and square-law generator 12 is brought into operation. The values of the resistances 17, 18 are chosen such that their ratio equals the square of the amplifier gain, ensuring that the change-over provides a continuous response function over 45 dB of dynamic range. The integrators 13, 14 use two capacitors alternately. allowing the non-used one to discharge during the period of one minute in which the other is charging. A comparator 19 has a variable low level reference and drives a l.e.d. 36. The comparator 20 responds to a higher fixed reference. To measure the baseband load, a baseband filter 26 comprising highpass, low-pass and pre-emphasis filter 33-35 provides a signal to a thermocouple square-law generator 27, integrator 28 and comparators 29-32 having references at the nominal level, 3 dB and + 6 dB. All the comparator outputs drive l. e. d.'s and their outputs are fed to a buffer register 37 which is up-dated at the end of every one minute period. A divide by 3000 clock 25 derives timing signals for the register and integrators from the 50 Hz mains frequency.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL7409666.A NL166831C (en) | 1974-07-17 | 1974-07-17 | DEVICE FOR MONITORING THE QUALITY OF BEAMS. |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1507079A true GB1507079A (en) | 1978-04-12 |
Family
ID=19821776
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB26750/75A Expired GB1507079A (en) | 1974-07-17 | 1975-06-24 | Device for monitoring the quality of radio relay links |
Country Status (9)
Country | Link |
---|---|
JP (1) | JPS5815985B2 (en) |
DE (1) | DE2528016C2 (en) |
DK (1) | DK325375A (en) |
FR (1) | FR2279275A1 (en) |
GB (1) | GB1507079A (en) |
IT (1) | IT1040926B (en) |
NL (1) | NL166831C (en) |
NO (1) | NO139540C (en) |
SE (1) | SE399623B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1985005518A1 (en) * | 1984-05-15 | 1985-12-05 | Australian Telecommunications Commission | Characterisation of digital radio signals |
GB2167925A (en) * | 1984-05-15 | 1986-06-04 | Australian Telecomm | Characterisation of digital radio signals |
AU576245B2 (en) * | 1984-05-15 | 1988-08-18 | Telstra Corporation Limited | Radio signal quality monitor |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1126544B (en) * | 1979-12-07 | 1986-05-21 | Dobfar Spa | PROCEDURE FOR THE PREPARATION OF 7-AMINO-DESACETOXY CEPHALOSPORANIC ACID DERIVATIVES |
JPS62192668A (en) * | 1986-02-20 | 1987-08-24 | Kyoritsu:Kk | Wattmeter |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1281635A (en) * | 1970-05-05 | 1972-07-12 | Sec Dep For Defence London | Improvements in or relating to detectors of electric signals |
-
1974
- 1974-07-17 NL NL7409666.A patent/NL166831C/en not_active IP Right Cessation
-
1975
- 1975-06-24 DE DE2528016A patent/DE2528016C2/en not_active Expired
- 1975-06-24 GB GB26750/75A patent/GB1507079A/en not_active Expired
- 1975-06-30 NO NO752390A patent/NO139540C/en unknown
- 1975-07-02 FR FR7520826A patent/FR2279275A1/en active Granted
- 1975-07-10 JP JP50084035A patent/JPS5815985B2/en not_active Expired
- 1975-07-11 IT IT50496/75A patent/IT1040926B/en active
- 1975-07-15 SE SE7508099A patent/SE399623B/en unknown
- 1975-07-17 DK DK325375A patent/DK325375A/en unknown
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1985005518A1 (en) * | 1984-05-15 | 1985-12-05 | Australian Telecommunications Commission | Characterisation of digital radio signals |
GB2167925A (en) * | 1984-05-15 | 1986-06-04 | Australian Telecomm | Characterisation of digital radio signals |
AU576245B2 (en) * | 1984-05-15 | 1988-08-18 | Telstra Corporation Limited | Radio signal quality monitor |
US4766600A (en) * | 1984-05-15 | 1988-08-23 | Australian Telecommunications Commission | Characterization of digital radio signals |
US4920543A (en) * | 1984-05-15 | 1990-04-24 | Australian Telecommunication Corporation | Characterization of digital radio signals |
Also Published As
Publication number | Publication date |
---|---|
NL166831C (en) | 1981-09-15 |
JPS5815985B2 (en) | 1983-03-29 |
DE2528016A1 (en) | 1976-01-29 |
IT1040926B (en) | 1979-12-20 |
NO752390L (en) | 1976-01-20 |
NL7409666A (en) | 1976-01-20 |
JPS5133918A (en) | 1976-03-23 |
DK325375A (en) | 1976-01-18 |
NL166831B (en) | 1981-04-15 |
FR2279275A1 (en) | 1976-02-13 |
SE399623B (en) | 1978-02-20 |
NO139540B (en) | 1978-12-18 |
SE7508099L (en) | 1976-01-19 |
NO139540C (en) | 1979-03-28 |
FR2279275B1 (en) | 1977-07-08 |
DE2528016C2 (en) | 1983-01-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |