Operating instructions

3-10 Amplifier Setup
7
Turn the manual gain reserve (MAN) control (illustrated in Figure 2-12) to maximum (fully
clockwise) and then reduce the output as noted in Table 3-3:
Table 3-3
Gain reserve versus ambient temperature
Temperature Gain Reserve
Above 110°F (43°C)
3 dB
32°F (0°C) to 110°F (43°C)
4 dB
Below 32°F (0°C)
5 dB
8
Check the amplifier output tilt by measuring the high band- and low band-edge carriers.
 High = channel 116 (745.25 MHz), channel 136 (865.25 MHz), or channel
158 (997.25 MHz).
 Low = channel 2 (55.25 MHz) or channel 3 (61.25 MHz)
 If the tilt is less than required, install a higher value input equalizer.
 If the tilt is greater than required, install a lower value input equalizer.
 If the high value equalizer provides too much tilt and the low value equalizer provides
too little tilt, use the lower value equalizer. Under-equalization is preferred to
over-equalization.
If you set up the MBV3-100* using an SCS-*, you must increase or decrease the JXP input
pad by the amount of change you made in the SCS-* value. Therefore, to maintain a proper
gain level, it is necessary to adjust the input pad value as follows:
 For each increase in SCS-* value, decrease the input pad by 1 dB.
 For each decrease in SCS-* value, increase the input pad by 1 dB.
 If you replace an SFE with an SCS-*, reduce the value of the input pad by the value of
the SCS.
9 Measure the output level at the highest frequency.
It should be within 1 dB of the system design level. If it is not, you must adjust the midstage
pad (
JXP) and/or the output pads (JXP 2 AND JXP 3/4) accordingly. Refer to Section 6,
“Operating Tips,” for midstage/output padding information and recommendations.
MBV3-100* Installation and Operation Manual