Masthead Amplifier

The best possible signal quality is straight off the antenna, once the signal leaves this point the signal gets degraded by system losses. Hence, after obtaining the best possible signal from the best possible antenna we need to work out the system loss and determine if an amplifier is required to overcome this system loss. The maximum gain of an amplifier should not be more than 10dB greater than the system loss.

If the signal level measured from the antenna is less than 60dBµV, a masthead amplifier such as the Hills LNDA or Q – Amp is recommended. Masthead amplifiers usually have a gain of 20 - 34dB, have a low noise figure and are capable of accepting a minimum level of not be less than 45dBµV.

Distribution Amplifier

Distribution Amplifiers are used to increase the signal level from an antenna and extend it to a multiple outlet network. Hence the main difference between a masthead and a distribution amplifier is the location of the amplifier in the system, the input working levels, noise  figures and output launch levels.

If signal level is above 70dBµV before requiring splitting the signal then a distribution amplifier is recommended. However, if the signal level drops below 70dBµV before the splitter it would be advisable to use a masthead amplifier. The gain of the distribution amplifier is chosen depending upon the system loss of the network from amplifier to outlet plate.

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