Garmin APOLLO GX SERIES Service Manual - page 86
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.