Romancell Technology Co. Ltd. SCP5560 用户手册

D 

● Allow more than 

20ft (6m) direct separation distance between the outdoor ANT and 

cell booster to avoid the loop oscillation to cause the booster to shut down with any 
1 or 2 blinking LED.

● The users must 

remove the DC plug from the DC jack of the cell booster 

immediately and tune/adjust the outdoor ANT direction/location. You may need to 
lengthen the direct distance between the outdoor ANT and cell booster. Re-plug the 
DC plug to the DC Jack of the booster as 

reset , verify these 2 LED lit solid red 

and/or green.

● Verify that the 2 LED lights are lit (red or green), not blinking (LED solid lit is a 

requirement for this booster in normal operation).

● If it is still blinking in any 1 or 2 LED , the users must remove the DC plug from the 

DC jack of the cell booster, repeat tuning/adjusting the ODANT for each cycle, then, 
reset the DC power of the cell booster 

until the 2 LED lights indicate solid red 

and/or green. 

● The users may further tune/adjust the direction/location to find the best reception.

(see 

P.4)

E 

● At any condition, the 2 LED lit 

remains solid Red or Green which represents the 

cell booster in normal operation. 

Solid R LED: The outdoor ANT captures insufficient outdoor cell tower signal level, 
smaller indoor service area. If far away for cell tower, it could be solid red only. 

Solid G LED: Sufficient outdoor cell tower signal level was captured by the outdoor ANT, 
larger indoor service area 

improving the service quality both voice and mobile internet.

● If any 1 or 2 LED lights are still blinking , either red or green must be avoided:

R LED blinking: Loop oscillation shuts down the cell booster and no longer enhance the 
reception, the troubleshooting procedure see 

P.9.     

G LED blinking: The outdoor ANT captures excessive signal level, and shuts down the 
cell booster. Generally, indicates the house is near the cell tower. The users must 
tune/adjust the outdoor antenna direction/location away from the cell tower to prevent the 
excessive reception. (See Abnormal operation of troubleshooting, 

P.10)

and 3rd Q&A of frequently asked questions, 

P.11) 

※

 To tune / adjust the outdoor ANT direction / location to 

allow the 2 green lights to 

become solid which allows the best reception both voice and mobile Internet and larger 
indoor coverage. (Detailed tuning procedure see 

P.5)

※

 In fringe area, the cell booster may still be 1 or 2 solid RED LED even after after 

carefully tuning/adjusting the outdoor ANT, that is the users allocation is far away from the 
cell tower for the RED LED band.

and larger indoor service coverage in the fringe area.) (see P.5)    

8

The users may 

verify the color of these 2 LED of the cell booster as an indication of 

the operational status. Users should follow the LED indication to solve the problem.

Normal operation: These 2 LED lit solid Red or Green, non blinking:

● 2 LED in solid RED but poor reception: 

Tune / Adjust the outdoor ANT direction / location as shown in 

P.5 to increase the incoming 

cell signal level which may improve both voice and mobile internet service coverage and 
quality.

※

 If the location of the residential house in fringe area like far away from cell tower or 

mountain area, valley, it may cause poor reception after carefully tuning / adjusting the 
outdoor ANT.

● 2 LED in solid Red but no reception:

Check all the connection are well connected as below:
a. Outdoor ANT + RF Adaptor + RG-6/U coaxial connector
b. RG-6/U coaxial connector + outdoor ANT connector of cell booster Indoor ANT 
c. Connectors cell booster + Indoor whip ANT 
d. RG-6/U coaxial connector + RF Adaptor + RG-6/U coaxial connector if the 17ft 

optional extension cable connection is used.       

※

 The users should power off and on 

again (Reset the power, P.3) the cell booster to 

ensure whether the new status is fine after any improvement procedure.

Abnormal operation: Any 1 or 2 LED blinking either Red or Green

● Blinking 1 or 2 RED LED: It is loop oscillation shut down. The users must turn off 

the DC power of the cell booster. Tune/adjust the outdoor ANT direction/location 
and / or extend the separation distance between the outdoor ANT and cell booster. 
Reset the DC power of the cell booster until the LED is in normal operation status. 

● Blinking Green LED indicates the outdoor ANT is facing toward proximity of the cell 

tower which captures excessive signal level. The users need to tune / adjust the 
direction / location of the outdoor ANT away from proximity of the cell tower and use 
the wall blockage of the residential house to reduce the excessive cell signal level of 
the proximity of cell tower and reset the cell booster.  

 

● To verify the 110VAC power socket / strip first.

● If the AC power socket / strip is normally working, check the AC-DC Adaptor 

connection both AC or DC plug to ensure the power deliver to the cell booster.

● If the AC-DC Adaptor cannot deliver the DC power to the cell booster, consult your 

dealer for a new AC-DC Adaptor. 

 

How will the weather affect to the cell phone indoor reception?

A: 

Sunny or cloudy day will not affect the indoor reception. Rainy, snowy, foggy day    

will reduce the indoor reception coverage, especially heavy rain, snow, fog may affect 

more. Also, the rain, snow, fog has more influence on PCS Band for its higher 

propagation loss than cellular band. 

 

Why the loop oscillation is the most 

important issue for a cell booster 

installation? How can I verify and prevent from it? 

 

The loop oscillation not only causes the cell booster to no longer serves the user’s 

link and 

not enough distance separation between the outdoor ANT and booster.

The users may check the 2 LED on the booster as the status indication of loop 

oscillation. Any 1 or 2 of the RED lit is blinking indicates loop oscillation of the cell 

booster. Remove the DC-plug from the DC jack of booster immediately, and follow the 

improvement procedure shown in 

P.5 or 6 until these 2 LED lit either solid Red or Green.

 

If my house is nearby the other operator’s cell tower and my cell operator’s tower 

is far from my house. How can I install and prevent the excessive signal level coming 

from the nearby cell tower?

 

First, you should turn away the outdoor ANT direction from the nearby cell tower 

and choose another direction/location, also, by using the house wall as the blockage of 

the nearby cell tower. 

 

Can the cell booster serve multiple users simultaneously?

 

Yes. The booster is designed for the multi-users operation for it is linear 

amplification and controls the overall power as well as blocking the interference of the 

cell tower.

 

Can the cell booster help Wi-Fi reception?

No. It cannot help the home Wi-Fi reception for they are different frequency band 

between the cell band and Wi-Fi band.

 

Does this cell booster help 4G700 and AWS band?

 

No, the cell booster only helps 800 (cellular) and 1900 (PCS) band.

All the mobile operators in 800 and 1900 band may be increased the reception inside the 

house by this booster.  

 

Is the cell booster helpful or harmful for human health?

 

It is 

helpful for human health by installing the cell booster.

The cell booster makes the cell phone radiates lower RF power to cell tower than not 

using a cell booster inside the house. The lower RF power radiated from the cell phone 

is not only helpful for human health also extend the battery life span.

Why do we use a panel ANT instead of an omni-directional ANT?

The panel ANT is a directional ANT which captures more cell signals from tower 

than the omni-directional ANT. That makes the panel ANT offers better service quality 

and larger indoor service area.