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PASSIVE DEVICES USED IN ANTENNA INSTALLATIONS (Antenna Installation)
 

PART 2

These materials are used in antenna installations but are "not" powered. These devices will always have a loss or attenuation in your system there when ever implementing one of these device include it in your LOSS/gain calculations.

  • Cable
  • Connectors
  • Splitters,
  • Diplexers,
  • Taps,
  • Outlet Plates

Outlet Plates:-

These come in different forms such as the "F" type, PAL, Saddle/Clamp, and Dual connections. They can be mounted on skirting, flush or recessed on or in walls. Austar, Foxtel and Optus all use the "F" type front and rear. Generally for domestic installations we all use the PAL because it's easy to disconnect or connect. When your calculating your dB's within your system you also have to deduct the loss a Outlet Plate will consume.

 

Diplexers:-

At some locations in Australia you may find that you need numerous signals from different transmission stations and hence you require more than one antenna. The output of the VHF antenna and the UHF antenna are combined and then fed into the outlet(s).

Did you know that Diplexers can be used in reverse? and act as a filter....

Using a VHF/UHF diplexer coming off a UHF antenna will reduce the amount of VHF signals by 20 dB. The main reason of a Diplexer being used as a filter is to reduce or filter out any unwanted channels or frequency band

If you use a Diplexer you must include this in yoru gain/loss calculations. The LOSS of about 2 dB

 

Splitters:-

Basically a splitter is exactly what it says, it splits a signal into two or more equal amounts.

  • 2 way splitter has a loss of 4 dB
  • 4 way splitter has a loss of 8 dB
  • 8 way splitter has a loss of 16 dB.

IF YOU WANT KNOW MORE - JUST SEARCH...

 

 

The major rule is that any unused port in a splitter must be plugged by a 75 ohm plug or if you do not have a plug you can make up a coaxial fly lead about 350mm long which should have a resistance of 75 ohms:). In reverse a splitter can combine signals together.

Taps and Directional Couplers:-

These are similar to splitters but the main differences are -

  • Splitters have in ports and out ports only (2way, 4way, 6way & 8way)
  • Splitters income signals into equal parts,
  • Taps have in, out and side ports (1way, 2way, 4way and 8way)
  • Taps come with different port values (8 dB, 12 dB, 15 dB, 20 dB)
  • Taps have a LOSS value of only 2 dB
Passive Device used in Installations Part 1

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This page was last modified on 1st December 2010 and maybe out of date with regards to its information at the time of reading this article. The information above is only intended for use a guide and should not be 100% relied upon as a substitute for official manufacturer technical advice. Quality Electrics disclaims responsibility for any damage, claim, or liability any person may incur, whether caused by negligence or otherwise, as a result of anything contained in our articles.
 

 
 
 

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