Ademco T8665C Wireless Thermostat User Manual A

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Document ID	183905
Application ID	wvbommtgDYo1q++A1L+KJg==
Document Description	users manual
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Permanent Confidential	No
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Document Type	User Manual
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Date Submitted	2001-12-17 00:00:00
Date Available	2001-12-17 00:00:00
Creation Date	2001-12-09 20:43:37
Producing Software	Acrobat Distiller 4.0 for Windows
Document Lastmod	2001-12-09 20:44:30
Document Title	A
Document Creator	Microsoft Word 10.0
Document Author:	Thomas W. Roche

HS9-T8665C
Test Report
DUT:
Model
Test Date:
Thermostat with RF Tranceiver
T8665C
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
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
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
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.
Table 1
RADIATED EMISSIONS DATA
CLIENT: HONEYWELL
ANTENNA: DIPOLES/DRG HORN
PART 15.249
Frequency
In
MHz.
916.431
1832.862
2749.293
3665.724
4582.155
5498.586
6415.016
7331.446
Ant.
Ant.
Polar. Factor
H/V
dB
30.5
30.2
33.4
35.7
36.6
38.6
39.1
40.8
FCC ID: HS9-T8665C
EUT: DATA TRANSMITTER
TEST DATE: 05-DEC-01
Peak
reading
dBm
-44.14
-91.17
-93.66
-97.21
-100.83
-104.54
-111.06
-117.52
Duty
Cycle
-dB
Peak
Power
Corrected
Power
FCC
Limit
uV/m@3m uV/m@3m uV/m@3m
46559
200
217
188
138
113
56
33
50000
500
500
500
500
500
500
500
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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Author                          : Thomas W. Roche
Title                           : A
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