Genex GX-80 User manual

GX-80 / GX-90 Alignment
The GX-80/90 has been carefully aligned at the factory for the specified performance across the
frequency range specified for each version. Re-alignment should therefore not be necessary
except in the event of component failure, or altering version type. All component replacement
and service should only be performed by an authorized GENEX TELECOM representative, or
the warranty policy may be void.
Required Test Equipment
zRF Signal Generator with calibrated output level at 1 GHz(or RADIO COMMUNITION TEST
SET)
zDeviation Meter (Liner Detector)
zAC Voltmeter
zSINAD Meter
zIn-Line Wattmeter with 5% accuracy at 500 MHz
zRegulated DC Power Supply adjustable from 4 to 10V, 3A
z50ΩNon-reactive Dummy Load: 10W at 500MHz
zFrequency Counter: ±0.2 ppm accuracy at 500MHz
zAF Signal Generator
zDC Voltmeter: High impedance
GX-80
Low Band Edge (Channel 1): 136.000MHz
Band Center (Channel 2): 155.000MHz
High Band Edge (Channel 3): 174.000MHz
GX-90
Low Band Edge (Channel 1): 430.000MHz
Band Center (Channel 2): 450.000MHz
High Band Edge (Channel 3): 470.000MHz
Note:
Signal levels in dB referred in the alignment procedure are based on 0 dBµ = 0.5.
PLL & Transmitter
Set up the test equipment as shown for transmitter alignment. Adjust the supply voltage to 7.4V
for all steps where not specified otherwise.

PLL VCV (Varactor Control Voltage)
zConnect the DC voltmeter between TP1 on the Main Unit and Ground.
zSet the transceiver to CH1 (low band edge), and adjust TC301 on the Main Unit for 1.0V ±
0.1V on the DC voltmeter, while receiving.
zSet the transceiver to CH1 (low band edge), and adjust TC302 on the Main Unit for 1.0V ±
0,1V on the DC Voltmeter, while transmitting.
zSet the transceiver to CH3 (high band edge), and confirm the high-end VCV is lower then
12.0V while receiving, and low than 12.0V while transmitting.
PLL Reference
zSet the transceiver to CH1 (low band edge), and adjust trimmer of the VCXO on the Main
Unit for band center frequency ±100Hz .
Transmitter Output Power
zSet the transceiver to CH1 (low band edge), and adjust RV2 on the Main Unit for that the
power meter reading is 5W. Confirm that the current consumption is 2.0A or below.
zSet the transceiver to CH1 (low band edge), and adjust RV3 on the Main Unit for that the
power meter reading is 1W. Confirm that the current consumption is 1.0A or below.
Modulation Level
Max Deviation: (VCO Modulation)
zSet the transceiver to CH2 (band center).
zInject a 1KHz tone at 100mVrms to the MIC jack.
zAdjust RV501 on the Main Unit for the deviation meter reading is ±4.2KHz(for 25KHz
steps) or ±2.1KHz(for 12.5KHz steps) deviation.
MIC Sensitivity
zSet the transceiver to CH2 (band center)
zInject a 1KHz tone at 100mVrms to the MIC jack.
zAdjust tone level so that the deviation meter reading is ±3.0KHz (for 25KHz steps) or ±
1.5KHz (for 12.5KHz steps) deviation.
CTCSS Deviation
zSet the transceiver to CH2 (band center).

zCheck the deviation meter reading is ±0.7KHz (for 25KHz steps) or ±0.35KHz (for 12.5KHz
steps) deviation.
CDCSS Deviation
zCheck the deviation meter reading is ±0.7KHz (for 25KHz steps) or ±0.3KHz (for 12.5KHz
steps) deviation.
Receiver
Set up the test equipment as shown for receiver alignment.
Sensitivity
zSet the transceiver to CH3 (high band edge)
zTurn the RF signal generator to the same frequency of the transceiver, than set the
generator output level to 40dB with ±3.0KHz deviation @ 1KHz tone modulation.
1) Adjust SSG RF Level and confirm if 12dB Sinad is below –119dBm.
2) Adjust RV2 to open Audio at 12dB Sinad.
3) Set tone frequency to SSG when there is channel set with CTCSS, DCS and
then set deviation to 10% Peak Dev. Then check if ORANGE LED is on.
4) Repeat the above in other channels.