6STARLINE
ADU Pads and Levels
A JXP pad is installed in the input line to the ADU location. This pad adjusts the ADU input level for the standard application of the amplifier. This pad may be changed depending on the operational output of the amplifier.
In general, the following JXP pad values are recommended in the amplifier ADU circuit and are the standard values installed at the factory.
Amplifier | Pad | Amplifier Output Level Range |
BLE*/* | +42 dBmV to +50 dBmV at 550 MHz | |
MB*/* | +42 dBmV to +50 dBmV at 550 MHz | |
BT*/* | +41 dBmV to +51 dBmV at 550 MHz | |
MBE*/* | +31 dBmV to +38 dBmV (trunk) and +40 dBmV to | |
| + | |
|
| 47 dBmV (bridger) at 550 MHz |
To determine the correct ADU pad value for other output levels:
!Increase the ADU pad by 1 dB for every 1 dBmV increase in output level.
!Decrease the ADU pad by 1 dB for every 1 dBmV decrease in output level. The levels for the MBE*/* assume a bridger gain 9 dB higher than the trunk.
Return Path Alignment
The following subsections describe procedures required to obtain proper return path alignment.
Before You Begin
For proper return path alignment obtain:
1RF alignment levels and insertion points for all amplifiers
2RF reference output level of the headend optical receivers
3A full complement of
4A reverse signal generator that produces at least one signal within the return bandpass and has a variable output
5Return sweep or alignment equipment It is recommended that you:
1Do not use wire jumpers to bypass the
2Set up the return optical link before you perform the amplifier set up.
3Specify reverse alignment design levels for a single carrier.
4Consider sweep equipment as a single carrier and operate at design levels.
5Do not include injection point losses in reverse design levels.
If JXP THERM devices
RF Amplifier Quick Start Guide
