MLC 8000 Analog Comparator Parameters
The MLC 8000 Analog Comparator in certain subsystems require settings in the Configuration Tool that correspond to the GTR 8000 parameters in CSS.
This table applies to the following subsystems:
- ASTRO 25 Analog-Only IP-Based Simulcast Subsystem
- ASTRO 25 Circuit-Based Analog-Only Simulcast Voting Subsystems
| GTR 8000 parameter in CSS | Corresponding MLC 8000 Analog Comparator parameter in the Configuration Tool | Subscriber must match the GTR 8000 and MLC 8000 parameters? |
|---|---|---|
| If Pre-Emphasis is Enabled | n/a — no impact | Yes |
| If De-Emphasis is Enabled | Select the Pre-Emphasis check box in the Modify Device Configuration window for MLC 8000 Analog Comparator (VGU), IP Simulcast tab. | Yes |
| If Compander is Enabled | If compression* is enabled, select the Compression check box in the Modify Device Configuration window for MLC 8000 Analog Comparator (VGU), IP Simulcast tab. | Yes |
| Rx Squelch Type = PL | In the PL/DPL list, select PL in the Modify Device Configuration — IP Simulcast tab of the MLC 8000 Configuration Tool with Analog Display and Control. | Yes |
Note*Compression is a technique that can be used to reduce the back ground noise level relative to voice signals. The effectiveness of the technique diminishes as RF wavelength increases. So, more benefit is expected in a 900 MHz system than a UHF-based system. As a consequence of utilizing compression, a listener may hear artificial characteristics in the voice signal that may be deemed unpleasant, but do not disrupt the ability to communicate. The choice of whether to use compression is dictated by the RF band in use and the preference to hear natural analog audio versus the need to reduce background noise.