Honeywell International Inc. T8665C Manuale Utente
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-T8665C
EUT: DATA TRANSMITTER
EUT: DATA TRANSMITTER
PART 15.249
TEST DATE: 05-DEC-01
Ant.
Polar.
H/V
916.431
V
30.5
-44.14
46559
50000
1832.862
V
30.2
-91.17
200
500
2749.293
V
33.4
-93.66
217
500
3665.724
H
35.7
-97.21
188
500
4582.155
V
36.6
-100.83
138
500
5498.586
H
38.6
-104.54
113
500
6415.016
H
39.1
-111.06
56
500
7331.446
V
40.8
-117.52
33
500
Table 1
RADIATED EMISSIONS DATA
Frequency
In
MHz.
Peak
Power
uV/m@3m
Peak
reading
dBm
Ant.
Factor
dB
ANTENNA: DIPOLES/DRG HORN
Duty
Cycle
-dB
FCC
Limit
uV/m@3m
Corrected
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 7
th
and 8
th
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.