IEC 60244-15:1999 pdf download – Methods of measurement for radio transmitters一 Part 15: Amplitude-modulated transmitters for sound broadcasting

IEC 60244-15:1999 pdf download – Methods of measurement for radio transmitters一 Part 15: Amplitude-modulated transmitters for sound broadcasting.
This part of lEG 60244 contains the methods of measurement to assess (he performance characteristics of amplitude-modulated transmitters for sound broadcasting in the LF, MF and HF bands.
This standard is intended to be used for type tests and acceptance or factory tests,
Fewer or additional measurements may be carried out by agreement between customer and manufacturer. Any additional measurements should preferably be in accordance with relevant standards published by the IEC or by other international bodies.
This part of IEC 60244 does not specify limiting values for acceptable performance as these are usually given in the equipment specification or in requirements laid down by the responsible regulating bodies. However, some values are quoted, where appropriate, for guidance in the presentation of the results.
2 Normative references
The following normative documents contain provisions which, through reference in this text. constitute provisions of this part of IEC 60244. For dated references, subsequent amendments to, or revisions 01. any of these publications do not apply. However, parties to agreements based on this part of IEC 60244 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IEC and ISO maintain registers of currently valid International Standards.
IEC 60244-1,— Methods of measurement for radio transmitters — Part 1: General characteristicS for broadcast transmitters If
ITIJ•R Recommendation 326, Oetermnaton and measurement of the power of radio transmitters
ITU-R Recommendation 559-1, Interference protection evaluation model for the radionavigation-satellite service in the 1 559-1 610 MHz band
ITU-R Recommendation 640, Single sideband (SSB) system for HF broadcasting
ITU-R Report 458, Characteristics of system in LF, MF and HF broadcasting
ITIJ-R Report 1059, Characteristics of s,ngle-sideband system in HF broadcasting
3.1
amplltude-.modulated Sound transmitter
radio transmitting equipment whose primary purpose is to convert audiofrequency signals into amplitude-modulated radiofrequency transmission
This detimlion covers double-sideband (DSB) transmitters with lull carrier. Including dynamic carrier-controlled systems (DCC), and single-sideband (SSB) transmitters with or without C-artier reduction.
NOTE Pa,llcular examDies of dynamic carnef-controlled systems include tynamlc amplitude modulation DAM1 and AM ooinpars*ng lAUd. S.. tigur.s 5 and 6 for id.at sp.clra for DS8, DCC and SS8 transmissions.
3.2
description of the transmission system for AM sound broadcasting
Relevant inlormalion concerning transmission systems tot AM Sound broadcasting is given In ITU-R Recommendations 326 and 640, and in ITU-R Reports 456 and 1059,
3.3
definitions of performance characteristics
For convenience, the definitions of particular performance characteristics are included in clause 6 describing the method of measurement.
4 General conditions of operation
Any device for the suppression of unwanted signals, irrespective of whether or not the device is located inside the transmitter, shall be considered as a part of the transmitter br the purpose of this standard.
Unless otherwise specified, the measurements shall be made under normal operating conditions and at rated output power. It required, they shall be repeated under extreme environmental conditions, In accordance with the equipment specification.
The transmitting mode and the measured output power of the transmitter under test shall be stated.
The mains supply and the environmental conditions shall be slated with the measurement results.
The transmitter shall be connected to a test load having a VSWR, relative to the nominal load impedance of the transmitter, not greater than
— 1,2:1 at frequencies within the designated broadcasting band:
— 1,5:1 at frequencies of any measured unwanted frequency up to ten times the highest frequency of the designated broadcastinU band.