Garmin APOLLO GX SERIES Service Manual - page 71
Garmin AT
Rev --
© 2004 Garmin AT
GX Service Manual
7-33
Modulation Capability
Step
General Instruction
Specific Instructions
Expected Results
1 Set
all
test
equipment as
specified in Test
Equipment Setup on
page 7-17.
2
Key the transmitter.
On the test box, press the PTT
switch to TX.
3 Record
%
modulation.
From HP8920, record reading of
the AM depth of modulation.
AM Depth of modulation will be
85% minimum with 100 mV
RMS at 1000 Hz.
4
On the test box, press the PTT
switch to RX.
5
On the test box,
move test cable
from MIC1
connector to MIC2
connector.
Repeat steps 2 through 4 with
MIC2.
Sidetone Audio Level and Adjustment
Step
General Instruction
Specific Instructions
Expected Results
1
Set all test equipment
as specified in Test
Equipment Setup on
page 7-17.
On the HP8920, set AF ANL to
Ext Load R to 100 Ω.
2 Connect
HP8920
audio out to MIC1.
1. On the test box, move
(HP8920 AUDIO IN cable)
from SPKR OUT to HDPH.
2. Put the TEST HDPH/LOAD
into the TEST HPHD
position.
3
Key the transmitter.
On the test box, press the PTT
switch to TX.