Combining aerial signals into 1 cable

This triplexer can combine UHF TV, FM radio and DAB radio aerial signals into one cable.

Downstairs you can use a second, identical triplexer) maybe fitted to a plate with holes drilled through it or wired to a plate with separate sockets) or a commercial diplexer plate (UHF and Radio). In the latter case you use a simple "Y splitter" to get the two radio signals.

Combining aerial and satellite signals

The simplest way is to use a Loft Box. But, if that solution is more than you need, you can base your design on the following sketch. The combiners shown below can be used in a variety of ways to get several signals into one cable. (Each can be used in reverse to decombine signals from one cable).

Frequency in MHz

For a better understanding, please look at the frequency chart, above. The frequency bands of interest are:

• the LNB band, stretching from 950 to 2150 MHz
• the UHF TV band + VHF TV band, from 470 to 806 MHz
• the FM and DAB radio bands, from 87.5 to 240 MHz

A diplexer can handle two of these bands. A triplexer can handle all three.

You can feed a triplexer with signals from all three bands and use another diplexer to separate them. Note that FM and DAB can be combined and separated by the V24-310 (above) because it is really a true "quadplexer" but a triplexer will keep DAB and FM together. This doesn't usually matter because you can use an ordinary splitter to get two lots of signals from the "Radio" output and feed one to an FM radio and one to a DAB radio. The radios will use whichever signal they want.

Note that this system does not permit you to combine, say, two LNB outputs into one cable because they both use the same band of frequencies. If you wanted to do this the only way would be to use a "stacker/destacker", which artificially creates a higher "LNB" band above 2150 MHz. The cable used for such a system has to be exceptionally good. SatCure does not stock staker/destackers because they can cause problems if the wrong cable is used, or even the wrong length of cable.

See page 15 to order these items.

IMPORTANT NOTES!

You should use fully-screened cable* for all connections. If you are trying to use existing TV aerial cable then it should be OK for the V24-310 but it could cause problems if used with the DIP2, since this carries the high frequency LNB signal. It might work provided the cable is fairly short but obviously we can't guarantee it. The usual result of using the wrong cable is that some satellite TV channels will be missing or suffer intermittent picture break-up (although this can also have other causes).

*We sell only fully-screened cable.

If you connect a masthead amplifier between the TV Aerial and the V24-310, please note that its power supply (if separate) must be fitted in that same cable OR between the V24-310 and the DIP2 (drawn in red). You MUST NOT fit an amplifier anywhere in the "drop cable" from the DIP2 because that cable carries the LNB voltage supply from your Digibox!

If you wish to distribute all these signals to other televisions, you should connect your Sky Digibox "RF outlet 2" to a SkyLink compatible amplified splitter with the required number of outputs.

If you don't have a satellite dish and simply want to combine aerial signals, omit the DIP2. The cable marked in RED goes down to your decombiner wall plate or to a second V24-310.

If you don't have radio aerials you simply omit the V24-310. Your LNB and TV aerial (red) feed the DIP2. The downlink feeds another DIP2 or a decombiner (diplex) wall plate. Easy!

IMPORTANT!

The basic systems discussed here may not be suitable for a house where you want TV in several rooms. Before making a final decision, please read our information about LOFT BOXES and our information about MULTISWITCHES.

Combining SAT and TV into one "drop cable".

Uses two DIP2 diplexers and a 100-00677 Maxview screened UHF + SAT non-isolated wall plate.

Combining SAT and TV into one "drop cable".

Uses a single DIP2 diplexer and a Televes 8241 Satellite/aerial decombiner outlet plate.

In this example, the LNB signal goes down the cable and the RF signal goes up the cable to a distribution amplifier. (Note that the LNB current feed also goes UP the cable.)

Q. Can I use a "magic eye" with this system?

A. Probably not.

Alternatively, use a single DIP2 diplexer and a Televes 8241 Satellite/aerial decombiner outlet plate.

Q. Can I use a "magic eye" with this system?

A. Probably not.

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If you have two lots of UHF signals to send down a single cable, you may be able to achieve this with a pair of UHF diplexers.

This example shows a 21-33 + 35-69 diplexer where the numbers represent the UHF channel numbers (21 is the lowest frequency UHF channel in the UK).

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