You are extending 1000 MHz video service from your existing headend to a new equipment room (ER). Your existing incoming video signal is plus (+) 15 dBmV.
You have three two-way splitters with a total of minus (-) 15 dB. You are adding 122 m (400 ft) of series 11 (RG 11) cable with a minus (-) 18 dB with eight single end F-connectors with a total of minus (-) 1.2 dB. From the selections below, what is the MINIMUM gain amplifier required in the headend room?
To determine the minimum gain amplifier required, we need to calculate the total loss and compare it with the initial signal strength. The existing incoming video signal is +15 dBmV. The losses include -15 dB from the splitters, -18 dB from the series 11 cable, and -1.2 dB from the F-connectors. Adding these losses gives a total loss of -34.2 dB. Subtracting this from the initial signal strength: +15 dBmV - 34.2 dB = -19.2 dBmV. To bring the signal back to an acceptable level, we need to add 20 dB of gain (to ensure a positive signal strength), because a +15 dB amplifier wouldn't be sufficient. Therefore, the minimum gain amplifier required is +20 dB.
Can some one help with this one? My approach was: dB Gain needed = (+)15 dBmV + (-)15 dB + (-)18 dB + (-)1.2 dB =19.2 db