Ademco T8665C Users Manual
HS9-T8665C
Test Report
DUT: Thermostat with RF Tranceiver
Model T8665C
Test Date: 13-July-2001
Manufacturer: Honeywell, Inc.
Home and Building Controls
1985 Douglas Drive
(763) 954-4972
Conducted by: Control Design & Testing, Inc.
6010 Red Fox Drive
Spotsylvania, VA 22553
(540) 582-2826
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HS9-T8665C
CD&T FCC ID: HS9-T8665C
A. DEVICE UNDER TEST
The product submitted for test is a thermostat used to control heating and air
conditioning systems. The product incorporates a radio tranceiver circuit to relay data
and control commands with other devices as part of an energy management system.
The product is designed to operate under the provisions of Part 15.249 of the FCC
rules.
The transmit and receive frequencies are 916.500 MHz. nominal. The modulation
mode is on/off keying using a proprietary protocol at 19.2 K bits/second. The device is
powered from an internal 4.5 VDC source consisting of three standard “AA” alkaline
batteries, connected in series. The tranceiver circuitry is regulated at 3 volts.
The rf section consists of an RF Monolithics TR1000L transceiver hybrid, a two element
antenna matching network and a 3.1 inch, #18AWG, solid wire antenna. The antenna
is soldered directly to the printed circuit board. There is no provision to connect an
external antenna.
B. MEASUREMENT PROCEDURE: RADIATED EMISSIONS
Testing of this device was conducted at the Hyak Laboratory test facility located in
Spotsylvania, Virginia.
Transmitter field strength measurements were conducted according to the procedures
set forth in ANSI C63.4 (1992). ). Testing was conducted with fresh batteries and
monitored periodically to insure that the battery voltage (under load) was maintained at
95% of nominal or greater.
The device under test was placed on a rotating turntable 0.8 meters high, centered 3
meters distant from the measurement antenna. The device was placed in the center of
the turntable and tested in the two positions shown in the test setup photographs.
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