Test Report Cont

FCC ID: JF6-8702-8W

Test Report

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FCCID_599223

2.1053 FIELD OF SPURIOUS RADIATION

The spectrum emissions of the equipment were measured in an anechoic chamber
at a distance of 3 meters. Measurements were made with the receiving antenna
mounted both horizontally and vertically.

Considering the transmitter as a dipole radiator, the field intensity for a given
power at a given distance can be expressed as:

E = 10 log ( ( P x 30 x G)/R2 )

Where: E = field intensity in dBV/m
P = transmitter mean output power (+32 dBm = 2 watts)
G = dipole antenna gain (1.64)
R = radius (3 meters)

E = 10 log ( ( 2 x 30 x 1.64)/9 ) = 10.5 dBv/m = 130.5 dBuV/m

Part 27.53 specifies that emissions below 2300 MHz and above 2370 MHz must
be attenuated from the transmitter power by:

A = 70 + 10 LOG (p) = 70 + 10 LOG (2) = 73 dB

Therefore, the maximum allowable spurious emissions at 3 meters are:

E = 130.5 dBuV/m – 73 dB = 57.5 dBuV/m

Measurements were made using a 1 MHz resolution bandwidth and the levels of
significant (greater than 35 dBuV/m) spurious emissions were recorded.

The significant spurious emissions found are as follows:

Horizontial
Freq dBc
72.85 95.8
121 102.1
145.4 95.5
148.23 94.5
169.6 87.7
218.2 87.4
266.9 97
274.9 89
290.85 95.2
296.4 86
315.1 93.6
336.07 89.7
339.175 85.9
345.675 80
363.875 84.2
395.2 83.1
411.95 86.3
436.32 90.8
509.12 90.8
592.33 85.2
630.7 91.4
655 85.8
825 85.5
2036 81.35

No significant spurious emissions were found above 2.37 GHz with the antenna mounted
horizontally.

No significant spurious emissions were found with the antenna mounted vertically.

2.1055 FREQUENCY STABILITY

The transmit source that is used is a crystal oscillator operating in the 125 MHz
range and multiplied up to the operating frequency.

Two sources were tested over a temperature range of -30 to + 50 degrees C and
the largest deviation over the specified temperature range was +/- 1.5 PPM, which
is adequate to maintain the transmit spectrum within the desired band of operation
as per FCC Part 27.54.

Crystal Oscilator Temperature Data

4
3
Parts Per Million

2
1
0
-1
-2
-3
-4
-30 -20 -10 0 10 20 30 40 50 60 70

Temperature (Degress C)

The sources were also tested over the range of the DC input voltage (+/- 15%) and
no significant variation in the frequency was observed.

Document Created: 2005-11-04 13:48:54
Document Modified: 2005-11-04 13:48:54

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