Vertex Standard VX-6000U Service Manual page 25

Alignment
Adjustdjust the AF generator for 50mV (–30dBm)
output at 1 kHz, as applied to the microphone
jack.
Key the transmitter and adjust "MAX Dev ( Nar-
row ) " for maxi-mum deviation of ±2.2 kHz (± 0
kHz) as indicated on the deviation meter.
CTCSS Modulation Level
Select the "low" power output level.
Select the band center frequency channel (CH7),
with 151.4 Hz CTCSS encode, and reduce the AF
generator injection to zero.
Key the transmitter and adjust "CTCSS Dev ( wide ) "
for CTCSS deviation of ±0.75 kHz (± 0.1 kHz) as
indicated on the deviation meter.
Select the band center frequency channel (CH9),
with 151.4 Hz CTCSS encode, and reduce the AF
generator injection to zero.
Key the transmitter and adjust "CTCSS Dev ( Nar-
row ) " for CTCSS deviation of ±0.35 kHz (± 0.1
kHz) as indicated on the deviation meter.
DCS Modulation Level
Select the "low" power output level.
Select the band center frequency channel (CH8),
with 023 DCS code, and reduce the AF generator
injection to zero.
Key the transmitter and adjust "DCS Dev ( wide ) "
for DCS deviation of ±0.75 kHz (± 0.1 kHz) as in-
dicated on the deviation meter.
Select the band center frequency channel (CH10),
with 023 DCS code, and reduce the AF generator
injection to zero.
Key the transmitter and adjust "DCS Dev ( Nar-
row ) " for CTCSS deviation of ±0.35 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.
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
Coupler
Meter
Frequency
CT-71
Counter
Connection
Cable
AC Volt
Meter
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 –6.0 dBµ
at the antenna jack.
Adjust "Rx TUNE" the receiver front-end tuning
for optimum SINAD, reducing signal generator
output level as necessary for proper meter de-
flection.
After the previous step, the final signal genera-
tor level should be less than –6 dBµ for 12dB
SINAD.
With the transceiver set to the band center fre-
quency channel (CH5), and with the RF signal
generator tuned to the same frequency, set the
generator for ±1.5 kHz deviation with 1 kHz tone
modulation, and set the output level for –4.0 dBµ
at the antenna jack.
After the previous step, and confirm the final sig-
nal generator level should be less than –4 dBµ
for 12dB SINAD.
RF Signal
Generator
Power Supply
13.8V DC
AF Test
Transceiver
Adapter
AF Generator
SINAD
Meter