How much signal is necessary from the subscriber's tap port @ 750 MHz to provide a minimum of 3.0 dBmV to the TV set, given a 150-foot drop?

To ensure that the TV set receives a minimum of 3.0 dBmV at 750 MHz, it's essential to consider the signal loss typically encountered over the drop from the tap to the subscriber's equipment. In cable systems, signal loss occurs due to factors such as cable length, frequency, and the type of coaxial cable used.

For a 150-foot drop at 750 MHz, the attenuation can be approximately calculated based on the characteristics of standard coaxial cable. The loss can be significant—typically around 6 dB for that length at the stated frequency. Therefore, to achieve a signal level of 3.0 dBmV at the TV, you need to compensate for this loss.

Adding the estimated loss to the desired output gives the required input signal level at the tap port. In this case, if we assume roughly 6 dB of loss over 150 feet, the calculation would be:

3.0 dBmV (desired signal at the TV) + 6 dB (loss) = 9.0 dBmV at the tap.

However, that does not reflect the correct consideration of typical setup practices or any potential additional losses from connectors, splitters, or additional factors that lead to recommending