SOLiD RocketWAVE™ SRF-L-8A1821 Product Manual
V1.7 - DEC 2021
© 2021 SOLiD, Inc. All Rights Reserved. Confidential & Proprietary.
Page 9
This function is that measuring the DL isolation value between donor antenna and service antenna during the
initialization process and setting the gain value for the repeater operation. If the measured values does not satisfy
the operating condition, the repeater is shutting down. Basically the gain value for DL/UL must be maintained un-
der [DL Isolation
– 15dB (
±
3dB)]. This process is applied to all service bands. Isolation Check is done within 30
seconds and Recheck is done within 10 seconds.
When a repeater is turned on, the system performs Isolation Check 3 times. The gain value is determined by re-
ferring to the lowest value among the three measured isolation values. If any one of these measured values does
not satisfy with operating condition (= satisfy shutting down condition), the value is excluded to the reference for
the gain value. And the repeater is shutting down.
If there occurs fluctuation in output power, more than 10 dB for 10 seconds over 5 times, the repeater performs
Isolation Recheck and set gain value properly for the last measured isolation value. After 1 hour, the repeater
performs Isolation Check one more time and set the gain value again.
Once the repeater starts to operate, the system performs the Isolation Check process one more time, once a day.
During the Isolation Recheck, the repeater is not going to shut down. If the isolation oscillation occurs while the
repeater is operating in the minimum gain value, Over-output Shutdown function performs to protect the repeater
and this time, the gain value is set to the minimum value if DL/UL gain is not under [DL Isolation -15dB (
±
3dB)].
Repeater Shutdown?
A repeater is shutting down when following conditions:
- DL input power is under -36dBm/Total, and measured isolation value is under 60dB.
- DL input power is over -36dBm/Total, and measured isolation value is under [DL/UL Gain + 15dB].
- Measured all 3 values satisfy above conditions.
Automatic Gain Control (AGC)
This function is that controlling gain value to maintain DL output power is [user setting value
±
2 dBm] when
each service band’s DL input power is within rated range. The UL Gain must be maintained [DL Gain
±
2 dB]. If
the Isolation ATT value is set due to Isolation Check, the repeater can control AGC ATT within [30dB - Isolation
ATT]. The DL In/Output and DL/UL Gain value for AGC operation is described as follows.
[B20 800 MHz]
DL Input (RSSI)
DL Output
DL Gain
UL Gain
-59 dBm
5 dBm
64 dB
64 dB
-54 dBm
10 dBm
64 dB
64 dB
-49 dBm
10 dBm
59 dB
59 dB
-44 dBm
10 dBm
54 dB
54 dB
-39 dBm
10 dBm
49 dB
49 dB
-34 dBm
10 dBm
44 dB
44 dB
-29 dBm
10 dBm
39 dB
39 dB
-24 dBm
10 dBm
34 dB
34 dB
