Saturday, 8 June 2013

how to adjust cable tv amplifier gain and slope



Slope - Difference in amplifier gain, or change in cable attenuation, between lowest and highest frequency present.

also related

Tilt - Maximum difference in transmission gain of a cable television system over a given bandwidth (typically the entire forward operating frequency range).
In other words. You lose more signal at higher channels through a peace of cable. To compensate for this an amp may have a slope control. This slope adjustment causes the amplifier to put out more signal at the higher channels than the lower ones flattening out the signal across the entire band from ch 2 to highest channel.

as an example:
you put 20 dB into a lenghth of cable on ch 2 and ch 60.

at the end of the cable you will have 8 db on ch 2 and 0dB on ch 60. Place a 20dB amp with 8dB of tilt (slope) and you will get 20dB out on ch 2 and 20dB out on ch 60 ( 8dB difference from low to high).
Input of  a amplifier can be ch no. 2 75dB and ch no. 60 75dB and then out put you can set / adjust as  first channel 88dB and last channel  (1st channel dB + slope dB) = 88dB + 8dB = 96dB
Final result is channel no 2 = 88dB and channel no. 60 = 96dB





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