Section 6
Operating Tips
This section describes using amplifiers in lower frequency systems and in lower gain systems.
Using Amplifiers in Lower Frequency Systems
When using the BT100 in 870 MHz or 750 MHz systems, you must consider the best method for handling the reduced bandwidth and
For distribution systems designed and installed as 1 GHz systems, but carrying a reduced channel load, there are no further concerns. You can add or remove channels at your discretion. If the system operates with ADUs/QADUs, the pilot channel cannot be disturbed. Reduced channel loading improves distortion.
For
40.7dB of gain at 870 MHz. If you need to adjust tilt, you may accommodate by changing the forward equalizer (SFE) value. Also, to avoid any additional loss in gain, it is optimal to use the equalizers that match the system frequency. For an 870 MHz system, the
Using Amplifiers in Lower Gain Systems
There are three pad facilities in the forward path: (1) is the pad location (JXP IN) at the input to the amplifier, (2) is the midstage pad (JXP) located between the
The input pad (JXP IN) is normally changed to accommodate excessive input levels. When operating at the same output levels, a BT100 with an input pad has the same
If necessary, to achieve the amplifier gain specification, you can use the midstage pad (JXP) or output pads (JXP OUT, JXP 1, JXP 3, and JXP 4) to reduce the gain of the BT100. However, this will affect amplifier performance. Output padding degrades the station distortion performance while having minimal effect on the
It is recommended that you contact Motorola’s TRC or your account representative for more specific information regarding use of the midstage and output pads.
BT100 Installation and Operation Manual