RSS-247 Testing of Digital Transmission, Frequency Hopping Systems, and Licence-Exempt Local Area Network Devices

As a leader in RF wireless product testing, Keystone Compliance recognizes the requirements needed for wireless radio manufacturers. Meeting the ETSI, FCC, and other wireless testing specifications can be challenging. Not only do we understand the challenges, but we help guide companies through the process. Keystone Compliance actively engages in the TCB Council, ANSI C63 Main Committee, and ANSI C63 wireless working groups.

Keystone Compliance’s accurate test reports are delivered quickly using our “four-eyes” approach. Meaning that multiple technicians review each report, ensuring that all the information required is present. Regarded as a leader in wireless testing, Keystone Compliance assists companies in RF testing on a daily basis. From concept through compliance, we tailor each test plan to individual customer needs minimizing unnecessary costs and over-testing. 

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Summary of RSS-247 Intentional Radiator Requirements and RF Compliance Information

This Radio Standard Specification (RSS) explains the requirements for radio equipment operating in the bands ranging from 902 – 928 MHz, 2400 – 2483.5 MHz, and 5725 – 5850 MHz. These radios must also employ frequency hopping, digital modulation, or a combination of both.

RSS-247 includes Licence-Exempt Local Area Network (LE LAN) devices. These devices operate in the bands 5150 – 5250 MHz, 5250 – 5350 MHz, 5470 – 5725 MHz, and 5725 – 5850 MHz.

Equipment covered by this standard is classified as category I equipment. Either a technical acceptance certificate or certificate issued by a certification body is required.

In addition to the requirements in RSS-Gen and the requirements stated in the testing of wireless devices, the method for measuring Digital Transmission System (DTS) devices is provided in ANSI C63.10. However, the test report is commonly prepared in accordance with RSS-Gen.

Scope of Frequency Hopping, Digital Transmission, and Hybrid Systems

Frequency Hopping Systems (FHS) employ multiple different spectrum technologies. These are in which the carrier is modulated with coded information in a conventional manner, causing a conventional spreading of the RF energy around the carrier frequency. The carrier frequency is not fixed. However, it changes at fixed intervals under the direction of coding sequences.

FHS is not required to employ all available hopping frequencies during each transmission. In addition, systems employing short transmission bursts must comply with frequency hopping equipment. These systems must distribute their transmissions over the minimum number of hopping channels specified.

Digital Transmission Systems (DTS) include systems that employ digital modulation techniques. These systems result in spectral characteristics similar to direct sequence systems. A minimum of 6 dB bandwidth is required to be 500 kHz between the bands of 902 – 928 MHz and 2400 – 2483.5 MHz. The transmitter power spectral density conducted from the transmitter can not be greater than 8 dBm in any 3 kHz band. This includes during any time interval of continuous transmission.

Hybrid systems use both frequency hopping and digital transmission techniques. These systems must comply with an average time of occupancy on any frequency not exceeding 0.4 seconds within a specified duration.

Lastly, in any 100 kHz bandwidth outside the frequency band in which a device is operating, the RF power that is produced must be at least 20 dB below that in the 100kHz bandwidth. This is based on either an RF conducted or a radiated measurement provided that the transmitter demonstrates compliance with peak conducted power limits. Attenuation below the general field strength limits specified in RSS-Gen is not required.

Expert RSS-247 Wireless and RF Testing Service

Keystone has a full lab of test equipment which permits us to provide short lead times on scheduling. Our RF testing lab strives to give our customers more time and energy on product development instead of testing. In addition to RSS-247 RF device testing, Keystone has a full scope of expertise including licensed radios, simultaneous transmitters, and pre-approved radio modules. 

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