User's Manual

61-89A-50-A18-G1-UserMan page 13 of 20
TX RX Systems Inc. Manual 7-9352 (version 4) 01/27/04 Page 13
so that we can add them together. The power in
watts is written in scientific notation but the chart
uses computer notation. For example, in the chart,
an exponent may be written as E-08. In conven-
tional mathematical notation E-08 is written 10
-8
.
The total power must be written as a number
between 0 and 10 to use the chart. Look up
1.611E-7 in the Watts column. This number falls
between -38 and -37 dBm so we chose -37
because it is the next higher value.
Reduction of Incoming Signal Strength
Reducing the strength of offending signals may
require some or all of the following steps:
a) The addition of extra filtering. Consult TX RX
System's sales engineers for help in this
respect.
b) Modification of the signal distribution layout by
changing the type or location of pickup anten-
nas. This has to be approached in an empirical
way, that is, change-and-try until you get the
desired results. Sometimes changing from omni
to directional antennas will correct the problem.
OPERATION
Power is applied to the signal booster by turning on
the AC power switch located on the junction box
inside the cabinet, refer to figure1. This will turn on
the power supply assembly and the LED indicator
on the power supply should come on indicating the
assembly is functioning normally.
The model 61-89A-50-A18-G1 signal booster sys-
tem is software controlled. Interface to the system
is done through the LCD display screen and the
menu select buttons located on the display panel,
see figure 1. A flow chart showing all of the possi-
ble user menu selections is shown in
Figure 4
.
Each menu selection will be discussed in detail
below. Upon power up the system will begin to
cycle through its normal boot-up sequence during
which time the LCD display will briefly show the
current software version, see
Figure 5
.
Main Status Display Screen
Once the boot-up sequence is completed (after
several seconds) the LCD display will switch to the
main status display screen as shown in
Figure 6
.
This is the normal display screen for the signal
booster. The system will return to this screen from
any other screen if no menu interface buttons are
pressed within 2 minutes.
The main status display screen shows the current
draw of all 6 amplifiers in the system. First the
uplink amplifiers, power (PA), mid-level (MID), and
low-level (LOW) then the three downlink amplifiers.
The current value will flash on and off for any
amplifier in error. The last line of the main display
screen gives a summary status message for the
entire signal booster. In this example “Status Okay”
is being displayed. Pressing the “ENTER” button
will move you from the main status display screen
into the menu selections and will permit interaction
with the system. There are two main functions
available within the software menus including con-
figuration settings and detailed status displays.
Power (dBm) Power (watts)
-45 dBm
3.16 x 10
-8
-43 dBm
5.01 x 10
-8
-41 dBm
7.94 x 10
-8
TOTAL
16.11 x 10
-8
Figure 6
: Main Status Display Screen.
Figure 5
: Software version is displayed briefly during
the boot-up sequence.