Garmin APOLLO GX SERIES, Service Manual

Page: 91 / 166

Garmin AT Rev --
© 2004 Garmin AT GX Service Manual 7-53
Weather Channel
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:
1. Set AMPLITUDE to 1000
µV.
2. Set Ext. Load R 4 ohms.
3. Set RF Gen Freq. to 162.4
MHz.
4. Set AF Gen1 to Fm and 3.0
kHz.
2 Select WTH. Adjust
Volume for 12 W.
Test TX inhibit.
On the Comm radio:
1. Press RCL. Use the large
right-hand knob to select
WTH162.4.
2. Press NRST to put channel
into primary.
3. Adjust radio volume until AC
Level reads 12 watts.
Directly behind the 0.40 on the
primary channel frequency, a
small x indicates the TX
function is disabled.
3 Test squelch. On the Comm radio, press
NRST to put channel the WTH
into secondary channel. The Comm radio will have no
audio out.
4 Test monitor. On the Comm radio press the
MON button. The Comm radio will have
pulsing 1000 Hz tone.
An arrow (>) will point toward
secondary (M162.4) frequency.
5 Test scan time. On the HP8920:
1. Select from the TO
SCREEN: SCOPE
2. Set the Time/div to 10 ms.
Approximately 20 ms blank
space will be displayed
between 1 kHz.
6 Intercom test. On the test box, press the
INT/OFF switch to INT. There will be no audio on the
SPKR connector.
7 Head set switch on if
intercom is on. Move the SPKR test cable to
HDPH test jack and the TEST
HDPH/LOAD switch to TEST
HDPH. The Comm radio will have
pulsing 1000 Hz.
An arrow (>) will point toward
secondary (M162.4) frequency