User's Manual

Manual 7-9410-1.2 Page 16
TX RX Systems Inc. 10/21/05
61-83B-50-XXX-XX UserMan page 16 of 25
Low and the Enter key toggles the gain setting.
The corresponding gain level is displayed. Select
Done using the arrow keys and press enter to
return to the menu. Use the Cancel button to return
to the Status Display.
Detailed Status Screens
These items allow a detailed examination of sys-
tem components including; all amplifiers (current
draw and temperature), the power supply (voltage
level), and the OLC function (present status and
historical archive). Each item is discussed below in
detail.
AMPLIFIERS
A separate status screen is available for each
amplifier in the system. When an amplifier is
selected this function will display the present cur-
rent draw of that amp as well as its present operat-
ing temperature in degrees Celsius. In addition, a
status message will indicate if the amplifier is con-
nected and whether the amplifier is bypassed or
not bypassed. This menu selection also provides
the option of placing an amplifier in bypass or tak-
ing an amplifier out of bypass.
The current draw will be blank if an amplifier is not
connected, will display BYP if the amplifier is
bypassed, and will display ATTEN if an attenuator
card is being used in place of the amplifier card.
The power amplifier currents will nor-
mally fluctuate up to 850 ma when sig-
nals are present.
POWER SUPPLY
This function displays the real time power supply
voltages for both 24 volt and 12 volt supplies.
OLC
This screen shows the amount of attenuation pres-
ently being used by the OLC for both the uplink
and downlink channels. In addition, the percentage
of OLC presently being used is also shown.
The amount of OLC currently being
used in either the uplink or downlink
channels is also indicated by LED bar
graph displays located on the display
panel. Each segment represents 2 to
4 dB of attenuation depending on the gain setting
of the booster. The OLC bars should only be active
occasionally and no more than 3 or 4 segments
briefly lit. Constant light bar activity means the
booster gain needs to be reduced for optimum per-
formance.
The system has 60 dB of OLC
dynamic range. However, it can be
reduced when a portion of the
dynamic range is used as fixed atten-
uation to reduce system gain. The
reduction will be an equal amount. For instance, if
the gain is reduced by 20 dB then the OLC
dynamic range will also be reduced by 20 dB. In
the factory, the system gain is allowed to be no
more than 3 dB above the minimum levels of 80/
60/45 dB. But every amplifier has slightly different
gains and some have higher gains than the others.
When a system gain is more than 3 dB above the
minimum level (due to fluctuation in amplifier
gains), part of the OLC dynamic range is pro-
grammed during final calibration as fixed attenua-
tion to reduce the system gain. In the field, a user
can further adjust the system gain by setting the
“user selectable gain” lower and effectively pro-
gramming more OLC dynamic range into fixed
attenuation.
OLC DATALOG
This screen displays an OLC Datalog which is the
OLC data over the past 100 days for both uplink
and downlink branches of the system. This is a roll-
ing 100 day log with day 101 overlapping day 1
and so forth. Day zero represents the current day
while day one represents yesterday and so on. The
logged data is stored in non-volatile memory and
will not be erased when the unit is powered down.
The average OLC attenuation used when the OLC
was active is given both for individual days and
over the entire past 100 days. The percentage of
time the OLC was active is also given for both indi-
vidual days and over the past 100 days. This
archived information will permit the creation of a
user signal profile to facilitate optimum system con-
figuration and performance.
This archive feature will allow you to see if the gain
of the unit is set too high or if there are transient
episodes of strong signals perhaps desensing
other channels being amplified by the booster.
NOTE
NOTE
NOTE