ADJUSTMENT PROCEDURE
5-6
December 1997
Part No. 001-7500-001
b. Press the F9 key and all filters are automatically
adjusted for peak levels.
Automatic Adjustment Method 2
(Adjusts only one filter at a time)
a. Select “BPF T1” and press F8 to automatically
adjust it for a peak level.
b. Repeat for the other three filters.
Manual Adjustment
a. Select “BPF T1” and press the adjust keys (
←
/
→,
PgUp/PgDn, or spacebar/backspace) to obtain
minimum distortion.
b. Repeat for the other three filters.
NOTE: The receive squelch adjustment in the next
section must be performed if the preceding adjust-
ment is made.
5.5.2 SQUELCH ADJUST
General
This adjustment can be made with the transceiver
completely assembled by removing the small
adhesive-backed label covering the access hole in the
chassis. Simply insert a sharp tool under the label and
carefully peel it off. A spare label is included with
each transceiver.
Adjustment Procedure
1. Select the 143.000 MHz channel with LB models
and the 150.000 MHz channel with HB models.
2. Connect a SINAD meter with an 8-ohm load to the
speaker (SP) jack.
3. Connect an RF signal generator to the antenna jack.
Set it to the channel frequency with an output mod-
ulated with 1 kHz at the following deviation:
Wideband (25 kHz) Models - 3.5 kHz
Narrowband (12.5 kHz) Models - 1.75 kHz
4. Preset R92 (see Figure 5-3) counterclockwise to
open the squelch. Adjust the generator output level
for 12 dB SINAD.
5. Rotate R92 clockwise to close the squelch and then
slowly rotate it counterclockwise until the squelch
just opens (audio is heard).
VHF ADJUSTMENTS (CONT’D)