Bose 3.2.1 GSX Specifications download pdf (Page 50)

50

TEST PROCEDURES

AM Performance Tests

AM Tuner General Test Setup

Set up an AM loop antenna as shown.

Note: In order to perform these tests, you

will need a test cable that allows the console

to be powered up without the bass module

attached. This cable connects to the 13 pin

connector on the back of the media center.

You will use this for the left and right audio

outputs for these test procedures. Refer to

the procedure on page 52 of this manual for

information about building this cable.

1. AM Sensitivity Test

1.1 Set the RF generator output to 55 dBuV/

M, 30% AM modulation, 1 kHz. Set the unit

and the RF generator frequency to 1090

kHz.

1.2 Measure the output level at the left

channel audio output. It should be between

70 and 320 mVrms at 1 kHz, with < 10%

distortion.

2. AM Stop Level Test

2.1 Set the RF generator to 1080 kHz, AM

modulation, 1 kHz, 30% modulation, 61

dBuV/M.

2.2 Place the unit into seek mode, and verify

that it stops at 1080 kHz.

2.3 Switch the RF generator for a 51 dBuV/

M field intensity and verify that the unit does

not stop at 1080 kHz.

FM Performance Tests

Note: Make sure that the output impedance

of the RF signal generator is matched to

the console’s 75 ohm FM antenna input

impedance. If using a 50 to 75 ohm adapter,

add the insertion loss (-5.7 dB) to the RF

generator settings in the following tests.

3. FM Sensitivity Test

3.1 Set the RF generator to 98.1 MHz,

1 kHz mono modulation, pilot off, 75 kHz

deviation, 20 dBf at the unit’s FM antenna

input.

3.2 Measure the distortion level at the right

or left audio output. It should be

< 3.0%.

4. FM Stop Level Test

4.1 Set the RF generator to 98.7 MHz,

1 kHz mono modulation, pilot off, 75 kHz

deviation, 38 dBf at the unit’s FM antenna

input.

4.2 Place the unit into seek mode and verify

that it stops at 98.7 MHz.

4.3 Reduce the RF generator to 28 dBf.

4.4 Tune the unit to 98.1 MHz and place

the unit into seek mode. Verify that the unit

does not stop at 98.7 MHz.

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