Avtech CSD-714 Selcal Manuel d'installation - Page 15
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- 1. Table of Contents
- 2. Description
- 3. Operation
- 4. Specifications
- 5. Installation
- 6. Installation Testing
- 7. Equipment and Accessory Part Numbers
- 8. Notes for Installation Figures
- 9. Figure 1 - Wiring Diagram
- 10. Figure 2 - Outline Drawing
- 11. Figure 3 - Code Programming
- 12. Figure 4 - 20 Db Attenuator
- 13. Figure 5 - Annunciator Output Circuits
CSD-714 Installation and Operation Manual
If the squelched audio output of the VHF is used, care must be taken to keep the audio input to the
CSD-714 within rating. The frequency response of the output must be such that the difference in
output level at any two frequencies between 300 and 1500 Hz is less than 3 dB. A 20 dB
attenuator may be required to reduce the audio level as referenced at the beginning of this section.
Do not use audio from cockpit volume controls as input to the CSD-714.
For receivers without transformer outputs with HI and LO signal lines, return the CSD-714
INPUT LO lines for the appropriate channel to a ground which is physically and electrically close
to the source radio to avoid ground noise pickup. Use twisted, shielded wire to connect the audio
to avoid hum and noise pickup.
1
23-21-01
June 1995
Seattle, WA USA
Rev 1
Page 9