Vertex Standard VX-900 Service Manual page 23

• Use the [t] or [u] key to select the "MID" fre-
quency channel in the alignment range.
• Disable any subaudible tone signaling on this
channel, if present.
• Press the [space] key on the computer keyboard
to start alignment. This activates the transmitter,
and injects a 1 kHz test tone.
• Press the [p] or [q] key, as needed, to set the
deviation to the desired value (typically 3.9 ~ 4.2
kHz, or 2.0 ~ 2.3 kHz for "narrow band" channels).
• When the desired deviation level is attained, press
[ENTER] to lock in the new value.
- [6] MIC G
AIN
This parameter is used to align MIC Gain level.
From the "(0) Common Tx" section, press [6] to
activate this alignment sequence.
• Use the [t] or [u] key to select the channel on which
you wish to adjust the MIC Gain.
• Press the [space] key on the computer keyboard
to start alignment. This activates the transmitter,
and injects a subaudible test tone.
• Use the [p] or [q] key to find the desired MIC
Gain level is achieved.
• Press the [ENTER] key on the computer keyboard
to lock in the new MIC Gain level.
- [7] S A D
UB UDIO EVIATION
This section adjusts the transmitter's subaudible
tone deviation level. From the "(0) Common Tx"
section, select [7] to enter this alignment sequence.
• After setting the Maximum Deviation in the pre-
vious section, it is now time to align the subaudi-
ble signaling deviation level.
• Use the [t] or [u] key to select the channel on
which you wish to adjust the Subaudible Devia-
tion.
• Press the [space] key on the computer keyboard
to start alignment. This activates the transmitter,
and injects a subaudible test tone.
• Press the [p] or [q] key, as needed, to set the
deviation to the desired value (typically 0.6±0.1
kHz, or 0.4±0.1 kHz for "narrow band" channels).
• When the desired deviation level is attained, press
[ENTER] to lock in the new value.
(1) Common RX :
- [0] T N S
IGHT OISE QUELCH
This parameter is used to align the "Tight Noise
Squelch" level. From the "(1) Common Rx" sec-
tion, select [0] to enter this alignment sequence.
• Set the signal generator output level to –0dBµ
EMF (0.5 µV).
• Press the [ENTER] key on your computer key-
board to set the "Tight" squelch level.
- [1] T N S
HRESHOLD OISE QUELCH
This parameter is used to align the squelch thresh-
old level. From the "(1) Common Rx" select [1]
to enter this alignment sequence.
• Set the signal generator output level to –10 dBµ
EMF (0.16 µV).
• Press the [ENTER] key on your computer key-
board to set the squelch "Threshold" level.
- [2] RSSI (R S
ECEIVED
S
QUELCH
This section allows adjustment of the RSSI level.
From the "(1) Common Rx" section, press [2] to
enter this alignment sequence.
• Set the signal generator output level to +3.0 dBµ
EMF ( 0.7 µV ).
• Press the [ENTER] key on the computer keyboard
to set the RSSI squelch level.
- [3] T S
X AVE
This section allows adjustment of the Tx Save ac-
tivation threshold (reducing the transmitter pow-
er in strong-signal environments). From the "(1)
Common Rx" section, press [3] to enter this align-
ment sequence.
• Set the Signal Generator output level to +15 dBµ
EMF ( 2.8 µV).
• Press the [ENTER] key on the computer keyboard
to lock in the TX Battery Saver threshold level.
Alignment
S I
IGNAL TRENGTH NDICATOR
)
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