Exam RCDD-001 topic 3 question 16 discussion

Actual exam question from BICSI's RCDD-001

Question #: 16
Topic #: 3

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?

A. Plus (+) 15 dB
B. Plus (+) 20 dB
C. Plus (+) 25 dB
D. Plus (+) 30 dB
E. Plus (+) 35 dB

Show Suggested Answer

Suggested Answer: A 🗳️

by LiONz5 at Nov. 28, 2022, 1:15 a.m.

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Igbonert

3 months, 3 weeks ago

Selected Answer: B

To calculate the minimum gain amplifier required, let's break down the signal loss: 1. Splitter loss: -15 dB 2. Cable loss: -18 dB (for 122m of Series 11 cable) 3. Connector loss: -1.2 dB (for 8 single-end F-connectors) Total signal loss: -15 dB - 18 dB - 1.2 dB = -34.2 dB Initial signal strength: +15 dBmV Signal strength after loss: +15 dBmV - 34.2 dB = -19.2 dBmV To determine the minimum gain required, we need to bring the signal strength back up to a usable level. Assuming a minimum signal strength of 0 dBmV (a common target), the amplifier gain should be: Gain required: 19.2 dB (to bring -19.2 dBmV up to 0 dBmV) To be safe, you might want to add a bit of headroom to the calculation. However, based on the calculation above, the minimum gain amplifier required would be approximately 20 dB.

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LiONz5

2 years, 12 months ago

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

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kanath1s

4 months ago

its A because thats the minimum gain amplifier needed to bring that up to standard.

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