Ademco T8665C Wireless Thermostat User Manual A

Honeywell International Inc Wireless Thermostat A

users manual

HS9-T8665C 1 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
HS9-T8665C 2 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.
HS9-T8665C 3 For transmitted radiated emission measurements, the sample was programmed to continuously transmit a typical data. This mode was also used to capture the occupied bandwidth plot shown below. Plot 1 The field strength measurements were taken using an HP8596E spectrum analyzer, an EMCO 3121C dipole set, an EMCO 3115 double ridge guide horn and an Avantek UJ210 preamp. The device was scanned in both transmit and receive modes from 30MHz. to 10GHz. and all emissions within 30 dB. of the limits were noted. The receiver in this device is a pulse sequenced TRF, clocked at approximately 1.54 MHz. and has no local oscillator. An effort was made to detect emissions that would be harmonically related to the sequencer clock but none were found.
HS9-T8665C 4 The controller circuit has clock oscillators at 32 kHz. , 500kHz. and 8 MHz. These frequencies and related harmonics were also investigated. Two frequencies related to the 8 MHz. clock (32.00 MHz. and 40.00 MHz.) were detected but were greater than 30dB below the limit and are not recorded in the table. At each detected emission frequency, the device was measured by rotating the turntable and adjusting the antenna height over a range of 1 to 4 meters to obtain the maximum output level. This procedure was performed with both horizontal and vertical antenna polarizations for both of the setup positions shown in the test setup photos. The peak reading for each frequency was recorded in the fourth column in Table 1 below. CLIENT: HONEYWELL FCC ID: HS9-T8665CEUT: DATA TRANSMITTERPART 15.249 TEST DATE: 05-DEC-01Ant. Polar. H/V916.431 V 30.5 -44.14 46559 500001832.862 V 30.2 -91.17 200 5002749.293 V 33.4 -93.66 217 5003665.724 H 35.7 -97.21 188 5004582.155 V 36.6 -100.83 138 5005498.586 H 38.6 -104.54 113 5006415.016 H 39.1 -111.06 56 5007331.446 V 40.8 -117.52 33 500Table 1RADIATED EMISSIONS DATAFrequency In MHz.Peak Power uV/m@3mPeak reading dBmAnt. Factor dBANTENNA: DIPOLES/DRG HORNDuty Cycle -dBFCC Limit uV/m@3mCorrected Power uV/m@3m Measurements taken for weak emissions were performed by reducing the distance from the measurement antenna to 1 meter and factoring –9.54dB into the calculation. This method was used for the 7th and 8th harmonics. C. OCCUPIED BANDWIDTH AND DUTY CYCLE The occupied bandwidth measurement was made using an HP8596E spectrum analyzer and plotted with an HP7475A pen plotter. The duty cycle correction factor for this device is approximately –4dB, but since the peak readings for all detected harmonics were below the limits, the duty cycle correction factor was not applied to the calculations.

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