Garmin APOLLO GX SERIES, Service Manual

Page: 86 / 166

Garmin AT Rev --
7-48 GX Service Manual © 2004 Garmin AT
Step General Instruction Specific Instructions Expected Results
10 Repeat steps 8 to 10 for every
200 Hz until 2500 Hz and at
4000 Hz. Audio frequency level vary <3
dB at AM Depth of modulation
of 85% at 350 Hz to 2500 Hz
and at 4000 Hz the level will be
down
≥ 15 dB.
Headset Output Response
Step General Instruction Specific Instructions Expected Results
1 Set all test
equipment as
specified in Test
Equipment Setup on
page 7-17.
2 On the HP8920:
1. Set AMPLITUDE to
1,000 µV.
2. Set AFGen1 to AM
85%.
3. Set Ext. Load R 100
ohms.
3 Move test cable. On the test box, connect
the HP8920 audio in
cable to HDPH.
4 Adjust volume
control on Comm
radio for 280 mW.
On the Comm radio,
adjust the volume
control until the AC
Level reads 0.280 watts.
5 Set AF Level as
reference. On the HP8920, select
AC Level. Push SHIFT
(Blue key). Push REF
SET, then push the
CURSOR CONTROL
knob. AC Level reads 0.00 dB.
6 On the HP8920, select
AFGen1 Freq. Set to
350 Hz.
7 Record AC Level. The level will not vary more than 3 dB at
350 Hz.
8 Repeat steps 8 to 10 for
every 200 Hz until 2500
Hz, and then at 4000 Hz. Audio frequency level will not vary more
than 3 dB from reference level of 1000
Hz at AM Depth of modulation at 85%
from 350 Hz to 2500 Hz, and will be
greater than 15 dB down at 4000 Hz.