HMG1 Multi-feature transceiver radio Cover Letter June 1, 2010 Wren Associates, LTD.

Wren Associates, LTD. Multi-feature transceiver radio

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February 19, 2019
TCB
Applications Examiner
RE: Modular Approval for Wren Associates, Ltd FCC ID: 2ARTD-HMG1
Dear Application Examiner:
Regarding Part 15 Unlicensed Modular Transmitter Approval, the following requirements called
out in FCC Public Notice DA 00-1407 are observed:
1) The modular transmitter must have its own RF shielding. This is intended to ensure that the
module does not have to rely upon the shielding provided by the device into which it is installed in
order for all modular transmitter emissions to comply with Part 15 limits. It is also intended to
prevent coupling between the RF circuitry of the module and any wires or circuits in the device
into which the module is installed. Such coupling may result in non-compliant operation.
The Wren Associates, Ltd model HMG1 MODULE is a completely self contained radio
which has its own RF shielding on the RF section. No other RF shielding is required or
implemented.
2) The modular transmitter must have buffered modulation/data inputs (if such inputs are
provided) to ensure that the module will comply with Part 15 requirements under conditions of
excessive data rates or overmodulation.
The Wren Associates, Ltd model HMG1 MODULE controls the data flow to the transmitter
section compliant with Part 15 requirements.
3) The modular transmitter must have its own power supply regulation. This is intended to ensure
that the module will comply with Part 15 requirements regardless of the design of the power
supplying circuitry in the device into which the module is installed.
The module itself has a self-contained power regulator. It will supply only the required
voltage to the Wren Associates, Ltd model HMG1 MODULE when installed in host device.
4) The modular transmitter must comply with the antenna requirements of Section 15.203 and
15.204(c). The antenna must either be permanently attached or employ a “unique” antenna
coupler (at all connections between the module and the antenna, including the cable). Any
antenna used with the module must be approved with the module, either at the time of initial
authorization or through a Class II permissive change. The “professional installation” provision of
Section 15.203 may not be applied to modules.
For this application the Wren Associates, Ltd model HMG1 MODULE employs a unique
antenna connector design to allow only the approved antennas to be operated with the
device.
5) The modular transmitter must be tested in a stand-alone configuration, i.e., the module must
not be inside another device during testing. This is intended to demonstrate that the module is
capable of complying with Part 15 emission limits regardless of the device into which it is
eventually installed. Unless the transmitter module will be battery powered, it must comply with
the AC line conducted requirements found in Section 15.207. AC or DC power lines and data
input/output lines connected to the module must not contain ferrites, unless they will be marketed
with the module (see Section 15.27(a)). The length of these lines shall be length typical of actual
use or, if that length is unknown, at least 10 centimeters to insure that there is no coupling
between the case of the module and supporting equipment. Any accessories, peripherals, or
support equipment connected to the module during testing shall be unmodified or commercially
available (see Section 15.31(i)).
The module itself was tested while connected to an evaluation board. The evaluation
board was provided as a means to communicate with the radio through the serial
connection. Nothing on the evaluation board contributes to the performance of the radio,
therefore the radio is considered to have been tested in a standalone configuration.
6) The modular transmitter must be labeled with its own FCC ID number, and, if the FCC ID is not
visible when the module is installed inside another device, then the outside of the device into
which the module is installed must also display a label referring to the enclosed module. This
exterior label can use wording such as the following: “Contains Transmitter Module FCC ID:
XYZMODEL1” or “Contains FCC ID: XYZMODEL1.”
Any similar wording that expresses the same meaning may be used. The Grantee may either
provide such a label, an example of which must be included in the application for equipment
authorization, or, must provide adequate instructions along with the module which explain this
requirement. In the latter case, a copy of these instructions must be included in the application for
equipment authorization.
The Wren Associates, Ltd model HMG1 MODULE consists of a printed circuit board
module, which is labeled with the FCC identification number. This PCB module can be
mounted in a host of devices and each device that contains this PCB module will have a
label on the exterior of the device visible to the end user which shall make the FCC ID
number visible to the consumer.
7) The modular transmitter must comply with any specific rule or operating requirements
applicable to the transmitter and the manufacturer must provide adequate instructions along with
the module to explain any such requirements. A copy of these instructions must be included in
the application for equipment authorization. For example, there are very strict operational and
timing requirements that must be met before a transmitter is authorized for operation under
Section 15.231. For instance, data transmission is prohibited, except for operation under Section
15.231(e), in which case there are separate field strength level and timing requirements.
Compliance with these requirements must be assured.
The Wren Associates, Ltd model HMG1 MODULE comes equipped with embedded
firmware that controls these parameters.
8) The modular transmitter must comply with any applicable RF exposure requirements. For
example, FCC Rules in Sections 2.1091, 2.1093 and specific Sections of Part 15, including
15.319(i), 15.407(f), 15.253(f) and 15.255(g), require that Unlicensed PCS, UNII and millimeter
wave devices perform routine environmental evaluation for RF Exposure to demonstrate
compliance. In addition, spread spectrum transmitters operating under Section 15.247 are
required to address RF Exposure compliance in accordance with Section 15.247(b)(4). Modular
transmitters approved under other Sections of Part 15, when necessary, may also need to
address certain RF Exposure concerns, typically by providing specific installation and operating
instructions for users, installers and other interested parties to ensure compliance.
The Wren Associates, Ltd model HMG1 MODULE complies with RF exposure requirements
for Mobile Equipment.
Regards,
Sandi McEnery
Agent for Wren Associates, Ltd
Download: HMG1 Multi-feature transceiver radio Cover Letter June 1, 2010 Wren Associates, LTD.
Mirror Download [FCC.gov]HMG1 Multi-feature transceiver radio Cover Letter June 1, 2010 Wren Associates, LTD.
Document ID4186605
Application IDy3GKJ6H8KMZmLXEuZztjgg==
Document DescriptionModular Approval Letter
Short Term ConfidentialNo
Permanent ConfidentialNo
SupercedeNo
Document TypeCover Letter(s)
Display FormatAdobe Acrobat PDF - pdf
Filesize10.67kB (133327 bits)
Date Submitted2019-03-01 00:00:00
Date Available2019-03-01 00:00:00
Creation Date2019-02-19 21:58:06
Producing SoftwareMicrosoft® Office Word 2007
Document Lastmod2019-02-19 21:58:06
Document TitleJune 1, 2010
Document CreatorMicrosoft® Office Word 2007
Document Author: George Yang

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Title                           : June 1, 2010
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