Manual 7-9415-1.4 Page 15
TX RX Systems Inc. 08/31/06
61-65-50 UserMan page 15 of 24
Attenuator Module:
Green only indicating DC
power is applied to the card.
OLC LIGHT BARS
Ideally, there should be little or no light bar activity.
Each light bar segment represents an average 3
dB of OLC gain reduction. OLC (output level con-
trol) is meant to reduce gain for transient episodes
of very strong signals. However, when OLC is
active, gain is reduced for all signals being pro-
cessed by that booster branch and that reduction
may compromise communications for weaker sig-
nals in the booster’s passband.
If more than 2 or 3 light-bar segments are lit up
more than occasionally, it is advised that the gain
of that branch be reduced. See the SET GAIN
paragraph on page 15 for details.
Front Panel Controls & the LCD Display
SB II is software directed so control of the system
is accomplished via user interface with the control
panel using the LCD display screen and the menu
select buttons, see figure 2. A flow chart showing
all of the possible user menu selections is shown in
Figure 7
.
LCD Screen
Once the boot-up sequence is completed (after
several seconds) the LCD screen will switch to the
main status display as shown in figure 6. This is the
normal display for the signal booster. The system
will return to this display from any other display if
none of the menu interface buttons are pressed
within 2 minutes. The exception is the OLC status
display which does require a button press to exit.
The main status display shows the uplink and
downlink gain in dB as well as the uplink and down-
link output level in dBm.
The last line of the main status display gives a
summary status message for the entire signal
booster. In this example “Status OK” is being dis-
played. Pressing the “ENTER” button will move
you from the main status display into the menu
selections and will permit interaction with the sys-
tem. There are two main functions available within
the software menus including configuration set-
tings and detailed status displays.
Configuration Settings
In most cases, the factory default settings are the
optimum values for adjustable parameters. The
most common setting to be changed by the sys-
tem’s technician is the gain setting. This is normally
done to compensate for varying values of antenna
isolation as outlined earlier in this manual or to
reduce excessive OLC action resulting from exces-
sive gain.
Please thoroughly study this section before making
any adjustments to the configuration values. Each
configured item is discussed in detail.
Note:
Changes to configuration set-
tings do not take affect until the Main
Status screen is re-enabled. This
occurs automatically after 2 minutes
without button input or manually by
pressing the Enter/Done/Cancel buttons to return
to the status screen.
RESTORE ORIG CONFIG
This command will restore all configured settings to
their original factory default values. SB II ships from
the factory preset to the lowest gain possible.
CALIBRATE CURRENTS
Use this command when replacing an RF amplifier.
This function automatically calibrates the current
alarm “trip” point of each amplifier in the system.
Due to manufacturing tolerances there are small
differences in current draw between amplifier
assemblies. This software function matches the
alarm sensing circuit to the respective amplifier
assembly and should be repeated whenever an
amplifier assembly is replaced.
SET GAIN
This function allows the user to electronically set
the gain of the booster in 0.5 dB increments over a
range of 30 dB. Gain can be adjusted indepen-
dently for both the uplink and downlink channels
but in most cases both uplink and downlink should
be set to the same gain value.
Know your antenna isolation before making this
adjustment. We recommend that you temporarily
disconnect both the uplink and downlink antennas
when setting the gain to avoid the possibility of
causing the unit to oscillate. After changing the set-
ting, power the unit down, reconnect the antennas
and power-up the booster.
NOTE
