User's Manual

© 2010, GS Teletech, Inc.
33
Version 0.2

May 2010
RF Conguration Menu FAQ’s
• What is the relationship between AGC (Auto Gain Control) and ALC (Auto Limit Control)?
ALC is for custom installations, and AGC is automatically used when AGS is turned on which is for normal installations.
If the repeater is having difficulties with isolation check, or if you wantto “power down” the repeater ALC should be
manually set. Attenuation may also be addedfor reducing power levels. ALC also provides optional U/L and D/L settings.
- The relationship between AGC and ALC is that they both will control the output power, but in different ways.
AGC will take priority over ALC, meaning if AGC is on, ALC cannot be used.
- If you want to use the ALC function, AGC should be turned off.
- The difference is that ALC will reduce max gain by the set value even if the input signal decreases. AGC will limit
the total output power to a set value while still allowing the repeaterto uctuate to max gain if input signal gets weaker.
• What does the Shutdown ON/OFF control?
- An internal wave-detection is checking the noise level. If the repeater cannot secure isolation it will go through a
process of turning itself off, and turning back on while doing isolation checking.
- If it is impossible for the repeater to secure isolation after 30 minutes, the repeater will shut down and stay shutdown.
The items that may automatically require the repeater to shut down are:
-> VSWR Alarm, Over Power Alarm, and Over Input Alarm
• What is Gain Balance Control?
- Gain Balance Control will always keep the UL and DL ATT the same while using AGC.
GBC should always be left on to prevent damage to BTS while using AGC.
- This is used for BTS to cell phone power control.