Radio Frequency Devices That [54 FR 17714, Apr
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47 CFR Ch. I (10–1–97 Edition) § 80.223
§ 80.223 47 CFR Ch. I (10±1±97 Edition) (3) The interval between successive able to be manually keyed. If provi- tones must not exceed 4 milliseconds; sions are made for automatically (4) The amplitude ratio of the tones transmitting the radiotelegraph alarm must be flat within 1.6 dB; signal or the radiotelegraph distress (5) The output of the device must be signal, such provisions must meet the sufficient to modulate the associated requirements in subpart F of this part. transmitter for H2B emission to at (d) Any EPIRB carried as part of a least 70 percent, and for J2B emission survival craft station must comply to within 3 dB of the rated peak enve- with the specific technical and per- lope power; formance requirements for its class (6) Light from the device must not contained in subpart V of this chapter. interfere with the safe navigation of the ship; [51 FR 31213, Sept. 2, 1986, as amended at 53 (7) After activation the device must FR 8905, Mar. 18, 1988; 53 FR 37308, Sept. 26, automatically generate the radio- 1988; 56 FR 11516, Mar. 19, 1991] telephone alarm signal for not less than 30 seconds and not more than 60 § 80.225 Requirements for selective seconds unless manually interrupted; calling equipment. (8) After generating the radio- This section specifies the require- telephone alarm signal or after manual ments for voluntary digital selective interruption the device must be imme- calling (DSC) equipment and selective diately ready to repeat the signal; calling equipment installed in ship and (9) The transmitter must be auto- coast stations. -
Radio Frequency Interference Analysis of Spectra from the Big Blade Antenna at the LWDA Site
Radio Frequency Interference Analysis of Spectra from the Big Blade Antenna at the LWDA Site Robert Duffin (GMU/NRL) and Paul S. Ray (NRL) March 23, 2007 Introduction The LWA analog receiver will be required to amplify and digitize RF signals over the full bandwidth of at least 20–80 MHz. This frequency range is populated with a number of strong sources of radio frequency interference (RFI), including several TV stations, HF broadcast transmissions, ham radio, and is adjacent to the FM band. Although filtering can be used to attenuate signals outside the band, the receiver must be designed with sufficient linearity and dynamic range to observe cosmic sources in the unoccupied regions between the, typically narrowband, RFI signals. A receiver of insufficient linearity will generate inter-modulation products at frequencies in the observing bands that will make it difficult or impossible to accomplish the science objectives. On the other hand, over-designing the receiver is undesirable because any excess cost or power usage will be multiplied by the 26,000 channels in the full design and may make the project unfeasible. Since the sky background is low level and broadband, the linearity requirements primarily depend on the RFI signals presented to the receiver. Consequently, a detailed study of the RFI environment at candidate LWA sites is essential. Often RFI surveys are done using antennas optimized for RFI detection such as discone antennas. However, such data are of limited usefulness for setting the receiver requirements because what is relevant is what signals are passed to the receiver when it is connected to the actual LWA antenna. -
Social Determinants of Unmet Hospitalisation
Nagulapalli, S 2013 Data from “Social determinants of unmet hospitalisation need amongst the poor in Andhra Pradesh, India: A cross-sectional study.” Journal of Open Public Health Data 1(1):e6, DOI: http://dx.doi.org/10.5334/jophd.af DATA PAPER Data from “Social determinants of unmet hospitalisation need amongst the poor in Andhra Pradesh, India: A cross- sectional study.” Srikant Nagulapalli1 2 1 Government of Andhra Pradesh, India 2 Collector and District Magistrate of Nellore, Andhra Pradesh, India The dataset is of a health survey amongst the 21.5 million poor families of the Indian state of Andhra Pradesh conducted during April and May 2013. The dataset captures individual characteristics and household characteristics of the past 365 days. Data was collected by 2022 trained field staff of Aarogyasri Health Care Trust (AHCT) of Government of Andhra Pradesh using a questionnaire mod- elled after that used for the health surveys by National Sample Survey Organisation of India. Keywords: health survey of Andhra Pradesh; Rajiv Aarogyasri; unmet hospitalisation need Funding statement The data is not the result of any funded project. (1) Overview (2) Methods Context Steps a) Design of questionnaire: National Sample Survey Spatial coverage Organisation (NSSO), Ministry of Statistics, Government Description: 23 districts Adilabad, Nizamabad, Karimna- of India conducts yearly consumer expenditure surveys as gar, Warangal, Hyderabad, Rangareddy, Medak, Mahbub- well as focussed surveys on health care. The health survey nagar, Nalgonda, Anantapur, Kurnool, Kadapa, Chittoor, questionnaire and the consumer expenditure question- Nellore, Prakasam, Guntur, Krishna, Khammam, West naire used for the 60th round (2004-05) of NSSO were Godavari, East Godavari, Visakhapatnam, Vizianagaram integrated by suitably abridging the consumer expendi- and Srikakulam of Andhra Pradesh state, India were cov- ture details and used for this survey. -
General Disclaimer One Or More of the Following Statements May Affect
General Disclaimer One or more of the Following Statements may affect this Document This document has been reproduced from the best copy furnished by the organizational source. It is being released in the interest of making available as much information as possible. This document may contain data, which exceeds the sheet parameters. It was furnished in this condition by the organizational source and is the best copy available. This document may contain tone-on-tone or color graphs, charts and/or pictures, which have been reproduced in black and white. This document is paginated as submitted by the original source. Portions of this document are not fully legible due to the historical nature of some of the material. However, it is the best reproduction available from the original submission. Produced by the NASA Center for Aerospace Information (CASI) . AE (NASA-TM-74770) SATELLITES FOR DISTRESS 77-28178 ALERTING AND LOCATING; REPORT BY TNTERAG .ENCY COMMITTEE FOR SEARCH AND RESCUE !^ !I"^ U U AD HOC WORKING GROUP Final Report. ( National. Unclas Aeronautics and Space Administration) 178 p G3 / 15 41346 0" INTERAGENCY COMMITTEE FOR SEARCH AND RESCUE AD HOC WORKING GROUP REPORT ON SATELLITES FOR DISTRESS ALERTING AND LOCATING FINAL REPORT OCTOBER 1976 r^> JUL 1977 RASA STI FACIUIV INPUT 3DNUH ^;w ^^^p^112 ^3 jq7 Lltl1V797, I - , ^1^ , - I t Y I FOREWORD L I^ This report was prepared to document the work initiated by the ad hoc working group on satellites for search and rescue (SAR). The ad hoc L working group on satellites for distress alerting and locating (DAL), formed 1 in November 1975 by agreement of the Interagency Committee on Search and Rescue (ICSAR), consisted of representatives from Maritime Administration, NASA Headquarters, Goddard Space Flight Center, U.S. -
The BPL Dilemma
Reprinted with permission from CQ VHF Magazine, Spring 2004 issue. Copyright CQ Communications 2004 The BPL Dilemma Hams claim Broadband over Power Lines will interfere with their on-the-air operations. The utility companies claim not. Read how they are both right . sort of. By Gary Pearce,* KN4AQ still academic. They haven’t encountered Because of the importance of the it yet. I will provide a quick tutorial. Broadband over Power Lines (BPL) The basics of BPL are simple. It is a issue, “FM” columnist Gary Pearce, method of delivering high-speed internet KN4AQ, devotes his space this time to the to homes and small businesses using the investigation of a BPL test site and the local power lines that crisscross neigh- surrounding area. He will be back in the borhoods either overhead or under- next issue of CQ VHF with his regular ground. This is a brilliantly obvious idea column material. —N6CL (“the wires are already there!”) that was delayed because the AC power grid is a really noisy, crappy signal-delivery ince last fall, I’ve been up to my medium for anything above 60 Hz. The eyeballs in BPL—Broadband over march of technology, however, is mak- Power Lines—and its effect on ing it feasible. It is the third method of Samateur radio. If you’re up on current TV doing that, following DSL (Digital culture, you can call it “HF Eye for the FM Subscriber Line) on the phone lines and Guy.” Our area has been “lucky” enough cable TV (nobody’s come up with a cute to host one of the few BPL trials, courtesy name or acronym for broadband over of my local power company, Progress cable TV; they just call it “cable”). -
ABBREVIATIONS EBU Technical Review
ABBREVIATIONS EBU Technical Review AbbreviationsLast updated: January 2012 720i 720 lines, interlaced scan ACATS Advisory Committee on Advanced Television 720p/50 High-definition progressively-scanned TV format Systems (USA) of 1280 x 720 pixels at 50 frames per second ACELP (MPEG-4) A Code-Excited Linear Prediction 1080i/25 High-definition interlaced TV format of ACK ACKnowledgement 1920 x 1080 pixels at 25 frames per second, i.e. ACLR Adjacent Channel Leakage Ratio 50 fields (half frames) every second ACM Adaptive Coding and Modulation 1080p/25 High-definition progressively-scanned TV format ACS Adjacent Channel Selectivity of 1920 x 1080 pixels at 25 frames per second ACT Association of Commercial Television in 1080p/50 High-definition progressively-scanned TV format Europe of 1920 x 1080 pixels at 50 frames per second http://www.acte.be 1080p/60 High-definition progressively-scanned TV format ACTS Advanced Communications Technologies and of 1920 x 1080 pixels at 60 frames per second Services AD Analogue-to-Digital AD Anno Domini (after the birth of Jesus of Nazareth) 21CN BT’s 21st Century Network AD Approved Document 2k COFDM transmission mode with around 2000 AD Audio Description carriers ADC Analogue-to-Digital Converter 3DTV 3-Dimension Television ADIP ADress In Pre-groove 3G 3rd Generation mobile communications ADM (ATM) Add/Drop Multiplexer 4G 4th Generation mobile communications ADPCM Adaptive Differential Pulse Code Modulation 3GPP 3rd Generation Partnership Project ADR Automatic Dialogue Replacement 3GPP2 3rd Generation Partnership -
The 630 Meter Band
The 630 Meter Band Introduction The 630 meter Amateur Radio band is a frequency band allocated by the International Telecommunication Union (ITU) to the Amateur Service, and ranges from 472 to 479 kHz, or equivalently 625.9 to 635.1 meters wavelength. It was formally allocated to the Amateur Service as part of the Final Acts of the 2012 World Radiocommunication Conference (WRC-12). Once approved by the appropriate national regulatory authority, the band is available on a secondary basis to countries in all ITU regions with the limitation that Amateur stations have a maximum radiated power of 1 Watt effective isotropic radiated power (EIRP). Stations more than 800 km from certain countries (listed below) may be permitted to use 5 Watts EIRP however. The ITU Final Acts took effect 1 January 2013 and after public consultation on all of the ITU allocation changes contained it, the 630 meter band was added to the Canada Table of Frequencies in 2014. Several countries had previously allocated the WRC-12 band to Amateurs domestically. Several other countries had also already authorized temporary allocations or experimental operations on nearby frequencies. The band is in the Medium Frequency (MF) region, within the greater 415–526.5 kHz maritime band. The first International Wireless Telegraph Convention, held in Berlin on November 3, 1906, designated 500 kHz as the maritime international distress frequency. For nearly 100 years, the “600-meter band” (495 to 510 kHz) served as the primary calling and distress frequency for maritime communication, first using spark transmissions, and later CW. In the 1980s a transition began to the Global Maritime Distress Signaling System (GMDSS), which uses UHF communication via satellite. -
En 300 720 V2.1.0 (2015-12)
Draft ETSI EN 300 720 V2.1.0 (2015-12) HARMONISED EUROPEAN STANDARD Ultra-High Frequency (UHF) on-board vessels communications systems and equipment; Harmonised Standard covering the essential requirements of article 3.2 of the Directive 2014/53/EU 2 Draft ETSI EN 300 720 V2.1.0 (2015-12) Reference REN/ERM-TG26-136 Keywords Harmonised Standard, maritime, radio, UHF ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N° 348 623 562 00017 - NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N° 7803/88 Important notice The present document can be downloaded from: http://www.etsi.org/standards-search The present document may be made available in electronic versions and/or in print. The content of any electronic and/or print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at http://portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: https://portal.etsi.org/People/CommiteeSupportStaff.aspx Copyright Notification No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm except as authorized by written permission of ETSI. -
The Following Part 15 Regulations Contain All Updates and Changes Adopted and Released by the Commission As of July 10, 2008
The following Part 15 regulations contain all updates and changes adopted and released by the Commission as of July 10, 2008. However, changes to the rules do not become effective until at least 30 days after they are published in the Federal Register. It is possible that recent changes to these rules may not have been published in the Federal Register and may not yet be effective. In addition, this version contains some directional notes, not themselves contained in the regulations. These directional notes are enclosed by brackets ([]). PART 15 - RADIO FREQUENCY DEVICES Subpart A - General Section 15.1 Scope of this Part. Section 15.3 Definitions. Section 15.5 General conditions of operation. Section 15.9 Prohibition against eavesdropping. Section 15.11 Cross reference. Section 15.13 Incidental radiators. Section 15.15 General technical requirements. Section 15.17 Susceptibility to interference. Section 15.19 Labelling requirements. Section 15.21 Information to user. Section 15.23 Home-built devices. Section 15.25 Kits. Section 15.27 Special accessories. Section 15.29 Inspection by the Commission. Section 15.31 Measurement standards. Section 15.32 Test procedures for CPU boards and computer power supplies. Section 15.33 Frequency range of radiated measurements. Section 15.35 Measurement detector functions and bandwidths. Section 15.37 Transition provisions for compliance with the rules. Section 15.38 Incorporations by reference. Subpart B - Unintentional Radiators Section 15.101 Equipment authorization of unintentional radiators. Section 15.102 CPU boards and power supplies used in personal computers. Section 15.103 Exempted devices. Section 15.105 Information to the user. -
Data-Over-Cable Service Interface Specifications DOCSIS 1.0 Radio
This version is superseded by the ANSI/SCTE 22-1 standard available here: http://www.scte.org/standards/Standards_Available.aspx Data-Over-Cable Service Interface Specifications DOCSIS 1.0 Radio Frequency Interface Specification SP-RFI-C01-011119 Notice This document is a cooperative effort undertaken at the direction of Cable Television Laboratories, Inc. (CableLabs®) for the benefit of the cable industry in general. Neither CableLabs, nor any other entity participating in the creation of this document, is responsible for any liability of any nature whatsoever resulting from or arising out of use or reliance upon this document by any party. This document is furnished on an AS-IS basis and neither CableLabs, nor other participating entity, provides any representation or warranty, express or implied, regarding its accuracy, completeness, or fitness for a particular purpose. Copyright 1997-2001 Cable Television Laboratories, Inc. All rights reserved. SP-RFI-C01-011119 Data-Over-Cable Service Interface Specifications 1.0 Document Status Sheet Document Control Number: SP-RFI-C01-011119 Document Title: Radio Frequency Interface Specification Revision History: I01 – First Release, March 26, 1997 I02 – Second Issued Release, October 8, 1997 I03 – Third Issued Release, February 2, 1998 I04 – Fourth Issued Release, July 24, 1998 I05 – Fifth Issued Release, November 5, 1999 I06 – Sixth Issued Release, August 29, 2001 C01 – Closed, November 19, 2001 Date: November 19, 2001 Status: Work in Draft Issued Closed Progress Distribution Restrictions: Author CL/Member CL/ Public Only Member/ Vendor Key to Document Status Codes: Work in An incomplete document designed to guide discussion and generate Progress feedback that may include several alternative requirements for consideration. -
Section 9 Summary of Results 9.1 Introduction 9.2
SECTION 9 SUMMARY OF RESULTS 9.1 INTRODUCTION Section 9.2 summarizes the results of NTIA’s preliminary investigations (Sections 2 – 5). These investigations helped refine the scope and approach of NTIA’s analyses and established certain technical assumptions. Section 9.3 summarizes the results of NTIA’s Phase 1 analyses of interference risks (Section 6), measurement procedures (Section 7) and techniques for prevention and mitigation of interference (Section 8). Section 9.4 summarizes matters requiring further study. 9.2 PRELIMINARY INVESTIGATIONS 9.2.1 Descriptions of BPL Systems NTIA identified three architectures for access BPL networks (Section 2): (1) BPL systems using different frequencies on medium- and low-voltage power lines for networking within a neighborhood and extensions to users’ premises, respectively; (2) BPL use of only medium voltage lines for networking within a neighborhood, with other technologies being used for network extensions to users’ premises; and (3) BPL use of the same frequencies on medium- and low-voltage power lines for networking in a neighborhood and extensions to users’ premises. Responses of BPL manufacturers and operators to the FCC’s BPL NOI generally indicate that BPL systems will operate at or near the Part 15 field strength limits in order to achieve maximum throughput and distance separation between BPL devices. NTIA addressed simple BPL deployment models in the Phase 1 interference risk analyses (Section 6). Specifically, a single BPL device and associated power lines were considered for cases of potential interference to ground-based radio receivers and several co-frequency BPL devices were assumed to be deployed throughout the area covered by an aircraft receiver antenna. -
G3/0'4 18909 I
TECHNICAL MEMORANDUM (NASA) 91 A MICRO-COMPUTER BASED SYSTEM TO COMPUTE MAGNETIC VARIATION A microcomputer-based implementation of a magnetic variation model for the continental United States is presented. The implementation computes magnetic variation as a function of latitude and longitude for general aviation receivers such as Loran-C. by Rajan Kaul Avionics Engineering Center Department of Electrical and Computer Engineering Ohio University Athens, Ohio 45701 March 1984 Prepared for National Aeronautics and Space Administration Langley Research Center Hampton, Virginia 23665 Grant No. NOR 36-009-017 (NASA-CR-1713376) A MICRO-COMPUTER BASED B84-20506 SYSTEM TO COMPUTE MAGNETIC VARIATION (Ohio Univ,) 26 p HC A03/IF A01 CSCL 17G Unclas G3/0'4 18909 I. INTRODUCTION A Mathematical model of magnetic variation in the continental United States (COT48) has been implemented in the Ohio University Loran-C receiv er. The model is based on a least squares fit of a polynomial function. The implementation on the micro-processor based Loran-C receiver is pos sible with the help of a math chip, Am9511 manufactured by Advanced Micro Devices, which performs 32 bit floating point mathematical operations. A Peripheral Interface Adapter (M6520) is used to communicate between the 6502 based micro-computer and the 9511 math chip. The implementation pro vides magnetic variation data to the pilot as a function of latitude and longitude. This report briefly describes the model and the real time implementation in the receiver. II. THE MATHEMATICAL MODEL The model was developed at the United States Geological Survey (USGS) by Fabiano et al. [11, by performing least squares analysis on more than 34,000 data measurements taken between 1900 and 1974.