Romancell Technology Co. Ltd. SCP5560 用户手册
11
Q:
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.
Q:
Why the loop oscillation is the most
important issue for a cell booster
installation? How can I verify and prevent from it?
A:
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.
Q:
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?
A:
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.
Q:
Can the cell booster serve multiple users simultaneously?
A:
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.
Q:
Can the cell booster help Wi-Fi reception?
A:
No. It cannot help the home Wi-Fi reception for they are different frequency band
between the cell band and Wi-Fi band.
Q:
Does this cell booster help 4G700 and AWS band?
A:
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.
Q:
Is the cell booster helpful or harmful for human health?
A:
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.
Q:
Why do we use a panel ANT instead of an omni-directional ANT?
A:
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.
Safeguard Features
Anti – oscillation:
If the Outdoor ANT and Indoor ANT of the cell booster installation is not enough
distance separation which may cause loop oscillation.
The cell booster will generate an unwanted interfered oscillation signal , the circuit will
detect this signal and soon to shut down.
The shut down not only protect the cell booster away from damage , also, eliminate
the interference to the tower.
distance separation which may cause loop oscillation.
The cell booster will generate an unwanted interfered oscillation signal , the circuit will
detect this signal and soon to shut down.
The shut down not only protect the cell booster away from damage , also, eliminate
the interference to the tower.
AGC and power control / power down
To prevent from both the excessive UL and / or DL cell signal which may cause the
interference and damage, The AGC circuit of both UL and DL CKT will control the
excessive incoming signal level.
Note that the UL AGC circuit will power down (mute) the UL C.K.T instantaneously
which caused from the short distance separation from the Indoor Antenna, it gets
normally operation while the users remain a certain distance away from the Indoor
ANT immediately.
And the DL AGC circuit shuts down the DC power caused from nearby/toward tower
signal permanently until the users adjust / tune the outdoors’s allocation / direction
and re-set the DC power again for normally operation.
interference and damage, The AGC circuit of both UL and DL CKT will control the
excessive incoming signal level.
Note that the UL AGC circuit will power down (mute) the UL C.K.T instantaneously
which caused from the short distance separation from the Indoor Antenna, it gets
normally operation while the users remain a certain distance away from the Indoor
ANT immediately.
And the DL AGC circuit shuts down the DC power caused from nearby/toward tower
signal permanently until the users adjust / tune the outdoors’s allocation / direction
and re-set the DC power again for normally operation.
Noise – power limiting
The cell booster will shut down the UL and/or DL power output to avoid the
interference of the cell tower which the cell booster is in condition:
● Loop oscillation
● The Outdoor ANT is toward/nearby the cell tower
● The users is very close to the Indoor ANT of the cell booster
● The ULCKT is in inactictivated mode (power down and awaiting next incoming call
activted)
interference of the cell tower which the cell booster is in condition:
● Loop oscillation
● The Outdoor ANT is toward/nearby the cell tower
● The users is very close to the Indoor ANT of the cell booster
● The ULCKT is in inactictivated mode (power down and awaiting next incoming call
activted)
Variable Gain
The cell booster will reduce the both UL and DLCKT Gain and power output while
nearby the cell tower automatically or nearby the indoor ANT for preventing from the
interference to the cell tower.
nearby the cell tower automatically or nearby the indoor ANT for preventing from the
interference to the cell tower.