Triplett CableRater- PN: 3279 - Manual (Page 23)

23
Figure 10
Amplifier and 16 Way Splitter
The amplifier must have the appropriate Gain to place the signal levels in the
appropriate range. A level towards the top end of the range is desired. Amplifiers
are available in several Gains, or in Variable Gain. Typical Gains are 10dB, 12dB,
15dB, or 20dB. A 15dB amplifier would be a good choice . This would raise the
level at each outlet to about +7 to +9dBmV.
To use the CableRater to test this system, first without the amplifier.. connect
the Transmitter to the input of the 16 way splitter. Then, connect the Receiver to
each outlet and measure the Loss. Its expected to read about -16dB. Next add
the amplifier to the circuit, connect the Transmitter to the input of the amplifier,
and measure the Loss at each outlet. It should read about -1dB.
So, if +10dBmV is applied to the input of the amplifier, about +9dBmV can be
expected at each outlet.
9.8.5 Long Cable Runs
If the length of the coaxial cable run exceeds about 50 feet, from the Cable
Provider’s connection on the outside of the building to the inside TV outlet, the
coax’s Loss must be considered. There may, or may not be splitters or amplifi-
ers in the line. The total length of the cable is what’s important.
Figure 6 shows that the Loss for 100 feet of RG-59 at 60MHz is about 2.4dB.
This amount of Loss is usually tolerable. However, the 900MHz Loss of 10.2dB