| Where can I get the specifications for short-range communication devices (SRD)? |
| Abstract: Although the use of short-range communication devices (SRD) does not require a license, each country has different laws and regulations for these devices. These devices are under the jurisdiction of different regulatory agencies. This article aims to give an overview of these regulations and tell the reader how to find this information on the Internet. This article also includes an overview of FCC Part 15 and ETSI EN 300-220. Although the use of short-range (SRD) devices does not require a license, each country has different laws and regulations for these devices. These devices are under the jurisdiction of different regulatory agencies. This article aims to give an overview of these regulations and tell the reader how to find this information on the Internet. In the United States, the Federal Communications Commission (FCC) is responsible for managing all radio frequency (RF) equipment. Any product that performs unlicensed work must comply with Article 47, Part 15 of the Federal Regulations. Part 15 can be obtained from the following address: http: //. [15.231 covers the 260MHz to 470MHz band, and 15.249 covers the 902MHz to 928MHz band. The following is a summary of 15.231 and 15.249. Section 15.231 According to section 15.231 (Sections a to d), a device is allowed to transmit: control or command signal ID codeword wireless control signal in case of emergency However, the device is not allowed to: transmit voice or video control toys transmit continuous data if the transmitter To be manually activated, transmission must stop within 5 seconds after the switch is released. If the transmission is automatic, then it must stop within 5 seconds of activation. Periodic transmission at regular predetermined intervals is not allowed unless the transmission period of each transmitter does not exceed 1 second per hour, such as periodic query or monitoring of transmitters in safety applications. The maximum field strength of the fundamental frequency (260MHz to 470MHz) increases linearly from 3750µV / m to 12500µV / m. The distance targeted by these limits is 3 meters. The clutter signal will be attenuated to 20dB below the fundamental frequency signal. The bandwidth cannot exceed 0.25% of the center frequency. The bandwidth is determined by the modulated carrier attenuation at 20dB. The device can be used for any type of work (segment e), as long as the output power is halved, the maximum transmission time is limited to 1 second and the interval between transmissions is 30 times the transmission duration (but not less than 10 seconds). All other provisions in paragraphs b to d are still valid. Section 15.249 Equipment operating in the 902MHz to 928MHz frequency band must comply with 15.249, and the allowed field strength is up to 50mV / m (distance 3m). Harmonics are limited to 500µV / m, while other clutter signals are limited to 50dBc. There are no restrictions on the content and duration of the launch. In Europe, the European Post and Telecommunications Authority (CEPT) is responsible for managing frequency band allocation and output power. The European Radio Administration (ERO) is the permanent office of the CEPT Telecommunications Commission (ECC) and is responsible for issuing the recommendations in ERC REC 70-03. The following is an overview of the 433MHz and 868MHz bands. The complete documentation can be obtained from the following address: http: //.
The European Telecommunications Standards Institute (ETSI) is responsible for the development of testing and verification standards. The standards for SRD equipment are in EN 300 220: http://pda.etsi.org/pda/home.asp?wki_id=9343 (EN 300 220-1) http://pda.etsi.org/pda/home.asp?wki_id=8804 (EN 300 220-2) http://pda.etsi.org/pda/home.asp?wki_id=6474 (EN 300 220-3) The following is a brief summary: Frequency error (Section 8.1) Frequency error or drift should not exceed the value under nominal or extreme conditions.
Note: (b) = fixed base station; (m) = mobile base station; (p) = portable base station carrier power (feed) (Section 8.2) applies to devices with fixed external antenna connectors. The carrier output power should not exceed the given power level.
The measurement of clutter signal emission (Section 8.7) shall be carried out without modulation. For transmitters operating below 470MHz, measurements must be made from 9kHz to 4GHz. For devices operating above 470MHz, the upper frequency limit is 12.75GHz. The power of any clutter emission, conducted or radiated, shall not exceed the following values:
Receiver clutter radiation (Section 9.4) Receiver clutter radiation comes from equipment and antennas. For receivers operating below 470MHz, measurements must be made from 9kHz to 4GHz. For devices operating above 470MHz, the upper frequency limit is 12.75GHz. The power of any clutter emission, conduction or radiation shall not exceed the following values:
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Swivel Disk socket circular design, compact and simple. Power Strip Round 360 ° distribution socket, large spacing, multiple plugs at the same time.
Double break switch + Overload Protection.
Fireproof ABS Plastic, PVC copper cable, Use standard plug. Easy and safe to use for elderly and children.
Qualified Power Cord allowing you extend the outlet 6ft (2 meters) away from the wall or even further.
Extension Cord Round,Swivel Disc Socket,Power Strip Round,Electric Plug Portable Socket
ZhongShan JITONGLONG Plastic Hardware Co. Ltd. , https://www.toukoo-electronics.com