Semtech E28-2G4T27SX User Manual page 19

9. The modular transmitter has been fully tested by the module grantee on the required number of channels,modulation types, and modes, it
should not be necessary for the host installer to re-test all the available transmitter modes or settings. It is recommended that the host
product manufacturer, installing the modular transmitter,perform some investigative measurements to confirm that the resulting composite
system does not exceed the spurious emissions limits or band edge limits (e.g., where a different antenna may be causing additional
emissions).
10. The testing should check for emissions that may occur due to the intermixing of emissions with the other transmitters, digital circuitry, or due
to physical properties of the host product (enclosure). This investigation is especially important when integrating multiple modular
transmitters where the certification is based on testing each of them in a stand-alone configuration. It is important to note that host product
manufacturers should not assume that because the modular transmitter is certified that they do not have any responsibility for final product
compliance.
11. If the investigation indicates a compliance concern the host product manufacturer is obligated to mitigate the issue. Host products using a
modular transmitter are subject to all the applicable individual technical rules as well as to the general conditions of operation in Sections 15.5,
15.15, and 15.29 to not cause interference. The operator of the host product will be obligated to stop operating the device until the
interference have been corrected .
12. Additional testing, Part 15 Sub part B disclaimer The final host / module combination need to be evaluated against the FCC Part 15B criteria for
unintentional radiators in order to be properly authorized for operation as a Part 15 digital device.
The host integrator installing this module into their product must ensure that the final composite product complies with the FCC requirements
by a technical assessment or evaluation to the FCC rules, including the transmitter operation and should refer to guidance in KDB 996369. For
host products with certified modular transmitter, the frequency range of investigation of the composite system is specified by rule in Sections
15.33(a)(1) through (a)(3), or the range applicable to the digital device, as shown in Section 15.33(b)(1), whichever is the higher frequency
range of investigation When testing the host product, all the transmitters must be operating. The transmitters can be enabled by using
publicly-available drivers and turned on, so the transmitters are active. In certain conditions it might be appropriate to use a
technology-specific call box (test set) where accessory 50 devices or drivers are not available. When testing for emissions from the
unintentional radiator, the transmitter shall be placed in the receive mode or idle mode, if possible. If receive mode only is not possible then,
the radio shall be passive (preferred) and/or active scanning. In these cases, this would need to enable activity on the communication BUS (i.e.,
PCIe, SDIO, USB) to ensure the unintentional radiator circuitry is enabled. Testing laboratories may need to add attenuation or filters
depending on the signal strength of any active beacons (if applicable) from the enabled radio(s). See ANSI C63.4, ANSI C63.10 and ANSI
C63.26 for further general testing details.
The product under test is set into a link/association with a partnering device, as per the normal intended use of the product. To ease testing,
the product under test is set to transmit at a high duty cycle, such as by sending a file or streaming some media content.
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