To provide a minimum of 3.0 dBmV to the TV set when using 150 feet of Series 6 cable, how much signal is necessary from the subscriber's tap port @ 750 MHz?

To determine the correct amount of signal necessary from the subscriber's tap port to ensure a minimum of 3.0 dBmV at the TV set after passing through 150 feet of Series 6 cable, it's essential to understand how signal loss occurs in coaxial cable.

Series 6 cable typically has a certain attenuation rate, which is the loss of signal strength per unit length of cable. For 750 MHz, a commonly accepted attenuation rate for Series 6 cable is approximately 3.5 dB per 100 feet. Therefore, for 150 feet of cable, the total loss can be calculated as follows:

1. Calculate the loss for 150 feet of cable:

• Since the loss is 3.5 dB for 100 feet, for 150 feet, it would be 3.5 dB * (150 / 100) = 5.25 dB.

2. Add the cable loss to the desired final signal level:

• To ensure that the TV set receives at least 3.0 dBmV, you need to add the calculated loss back to this level:

• 3.0 dBmV (desired level at the TV) +