12
25A1104 (Rev.1)
TONE KEY INDICATOR
1. Modulate the RF signal with 32.768 kHz tone key generator. (If using an HP E4400B RF Generator use the Dual-
Sine wave feature by pressing: more, FM Waveform (Sine), and Dual-Sine). Set the following:
• FM Tone 2 Rate = 32.768kHz
• FM Tone 2 Amplitude = (see table below)
2. Connect an antenna to the RF signal generator output.
3. Verify that the 1kHz tone audio output is audible and the red "peak" LED is lit on the receiver.
AUDIO OUTPUT LEVEL AND DISTORTION
1. Attach audio analyzer to ¼" output and measure output level to be -3.3dBu +/- 2.5dB.
2. Measure Audio output of XLR to be -17.0dBu +/- 1.5dB.
3. Engage the A-weighting and 30 kHz LP filters on the HP8903.
4. Measure distortion to be less than 1%.
FREQUENCY RESPONSE USING AN RF GENERATOR.
1. Disengage all filters on the audio analyzer.
2. Set the audio analyzer to measure AC level in dB’s.
3. Connect the audio analyzer input to the ¼" output of the receiver.
4. Record this level by engaging the “
ratio” button on the audio analyzer.
5. Change modulation to 20kHz on the RF generator.
6. Measure ¼" output to be -21dBu +/- 3dB.
7. Change modulated frequency on the RF generator to 400Hz.
8. The audio output level should be +5dB ± 1dB relative to the 1kHz level.
RF POWER AND SQUELCH LEVEL
1. Disengage the “ratio” button on the audio analyzer.
2. Change modulated frequency on the RF signal generator to 1kHz.
3. Engage the 400Hz filter and 30kHz filter on the audio analyzer.
4. Set RF level to -110 dBm. The Receiver should be squelched.
IF ALL TESTS PASSED, THIS MEANS THE UNIT IS PROPERLY FUNCTIONING, AND NO ALIGNMENT IS REQUIRED.
Deviation
Q11
All other frequencies
27.5 kHz 37.5 kHz
FM Tone 2 Amplitude
Q11
All other frequencies
16% 12%
To Next Page
Loading...
Need help?
General
