Vertex Standard VX-5500V Service Manual page 25

Alignment
r Key the transmitter and adjust "MAX Dev ( Nar-
row ) " for maximum deviation of 2.2 kHz ± 0.2 kHz
as indicated on the deviation meter.
CTCSS Modulation Level
r Select the "low" power output level.
r Select the band center frequency channel (CH7),
with 151.4 Hz CTCSS encode, and reduce the AF
generator injection to zero.
r Key the transmitter and adjust "CTCSS Dev ( wide ) "
for CTCSS deviation of 0.9 kHz ± 0.1 kHz as indi-
cated on the deviation meter.
r Select the band center frequency channel (CH9),
with 151.4 Hz CTCSS encode, and reduce the AF
generator injection to zero.
r Key the transmitter and adjust "CTCSS Dev ( Nar-
row ) " for CTCSS deviation of 0.45 kHz ± 0.1 kHz
as indicated on the deviation meter.
DCS Modulation Level
r Select the "low" power output level.
r Select the band center frequency channel (CH8),
with 023 DCS code, and reduce the AF generator
injection to zero.
r Key the transmitter and adjust "DCS Dev ( wide ) "
for DCS deviation of 0.8 kHz ± 0.1 kHz as indi-
cated on the deviation meter.
r Select the band center frequency channel (CH10),
with 023 DCS code, and reduce the AF generator
injection to zero.
r Key the transmitter and adjust "DCS Dev ( Nar-
row ) " for CTCSS deviation of 0.4 kHz ± 0.1 kHz
as indicated on the deviation meter.
5-4
Receiver
The sensitivity parameters can be adjusted from
the computer by utilizing the Alignment Software.
Refer to the onboard help of the Alignment Software
Manual for details.
r Set up the test equipment as shown for receiver
alignment, and install the audio test adapter.
50-Ohm
Dummy Load
Inline
Wattmeter
RF Sampling
Deviation
Meter Coupler
Frequency
CT-71
Counter
Connection
Cable
AC Volt
Meter
r With the transceiver set to the band center fre-
quency channel (CH2), and with the RF signal
generator tuned to the same frequency, set the
generator for ±3.0 kHz deviation with 1 kHz tone
modulation, and set the output level for –5.0 dBµ
at the antenna jack.
r Adjust "Rx TUNE" the receiver front-end tuning
for optimum SINAD, reducing signal generator
output level as necessary for proper meter de-
flection.
r After the previous step, the final signal genera-
tor level should be less than –5.0 dBµ for 12dB
SINAD.
RF Signal
Generator
Power Supply
13.6 13.8V DC
AF Test
Transceiver
Adapter
AF Generator
SINAD
Meter