11
25A1090 (Rev.3)
FREQUENCY RESPONSE TEST
1. Set the audio generator as follows:
•
Frequency = 1 kHz
• Amplitude = -20 dBu
• Filters = 30 kHz LPF
2. With the audio analyzer, probe TPA2 (top side), it should read -3.4dBu ± 0.5dB. Record this level
using the Ratio button. This level will be used as your reference level for the following test.
3. Change the generator's frequency to 100Hz and measure the level at TPA2 to be -2.2dB ± 0.2dB
relative to the 1kHz reference level.
4. Change the generator's frequency to 10kHz and measure the level at TPA2 to be +2.3dB ± 0.2dB
relative to the 1kHz reference level.
5. Disengage the Ratio button.
DISTORTION TEST
1. Set the audio generator frequency to 1kHz with an amplitude of -20.0dBu.
2. Activate the 30kHz LPF on the audio generator.
3. Measure the total harmonic distortion and noise (THD+N) at TPA2 to be less than 0.7%.
RADIATED RF OUTPUT POWER AND FREQUENCY STABILITY TEST
1. Choose any group and channel free of interference. Using a spectrum analyzer with the appropri-
ate-band UA820 antenna, measure the approximate near field radiated power as follows:
• SPAN=100 MHz
• REF LVL=10dBm
• FREQUENCY=(Look at tables on pages 18 thru 23)
2. Extend the UA820 away from the analyzer into the horizontal plane (straight out). Align the SLX2
antenna parallel to the UA820 as close as possible. Move the unit along the UA820 antenna until
you find a maximum peak.
3. Do a peak search and measure the power to be at least 2 dBm for H5, J3, L4, and P4 bands and at
least 0 dBm for Q4, R5, JB, and S6 bands.
4. Set SPAN to 200 KHz. Measure the frequency to be within +/- 3 kHz of the nominal frequency you
are testing. (See frequency tables on pages 19 to 24).
TONE KEY LEVEL TEST
1. Set Power Supply to 3.0VDC
2. Find transmitting carrier on the spectrum analyzer with a span of 200 kHz. Use the "Peak Search,
Marker Delta, Next Peak" soft-keys on the analyzer.
3. Measure the 32.768 kHz tone key level to be -21 dBc ± 1.5 dB.
4. Set Power Supply to 2.1 V (1 segment on LCD battery icon).
5. Measure the 32.768 kHz tone key level to be -14 dBc ± 1.5 dB.
OCCUPIED BANDWIDTH TEST (JB model only)
1. Set transmitter gain to maximum.
2. Set up the HP-8591E spectrum analyzer to measure Occupied Bandwidth with the following set-
tings:
• Percentage Power = 99.5%
• Channel Spacing = 250 kHz
• Bandwidth = 110 kHz
3. Connect the audio generator to TQG connector CON90. Use a 1 kHz tone with a level that gives -
23.47 dBu (52mV) at TPA3.
4. Increase the audio level by 36dB.
5. Measure Occupied Bandwidth to be less than 110 kHz.
ADJACENT CHANNEL POWER TEST (JB model only)
1. Set the spectrum analyzer, and audio input level to the same settings as stated in “Radiated RF
Output Power and Frequency Stability” and “Distortion Test”.
2. Measure Extended Adjacent Channel Power to be less than -60 dB.
IF ALL TEST PASSED, THIS MEANS THE UNIT IS PROPERLY FUNCTIONING, AND
NO ALIGNMENT IS REQUIRED.
To Next Page
Loading...
