UHF + UHF Antenna Diplexer

[Rodney Josey]

If I've posted to the wrong NG for this then please advise...

Does anyone know if there is such a thing as a 'diplexer' for combining two UHF antenna's each
pointing in different directions into a single cable prior to being input into an antenna amplifier
?

I have need of 2 x UHF antennas - main one facing north for 4 free-to-air channels & a secondary one
facing to the south for a separate single free-to-air channel. Now I can get a 'diplexer' for
combining a VHF antenna plus a UHF antenna into a single cable which on taking one apart shows that
the VHF side stripline resistive load is different than that used on the UHF side - so NO GO for
using such a 'diplexer' when I need to combine 2 x UHF cables together into the one cable feeding
into the input of an external aerial amplifier.

Any ideas on what I could do to get this ?

Oz-Rod

 

[gwhite]

Don Pearce wrote:

On Mon, 17 Jan 2005 15:55:10 +1000, Rodney Josey
rjosDIESPAM@dodo.com.au> wrote:

If I've posted to the wrong NG for this then please advise...

Does anyone know if there is such a thing as a 'diplexer' for combining two UHF antenna's each
pointing in different directions into a single cable prior to being input into an antenna amplifier
?

I have need of 2 x UHF antennas - main one facing north for 4 free-to-air channels & a secondary one
facing to the south for a separate single free-to-air channel. Now I can get a 'diplexer' for
combining a VHF antenna plus a UHF antenna into a single cable which on taking one apart shows that
the VHF side stripline resistive load is different than that used on the UHF side - so NO GO for
using such a 'diplexer' when I need to combine 2 x UHF cables together into the one cable feeding
into the input of an external aerial amplifier.

Any ideas on what I could do to get this ?

Oz-Rod

What you need is not a diplexer, which operates on different
frequencies, but a simple UHF splitter, as you would use to feed a
single antenna to two TVs. This will provide the function you need. A
disadvantage is that by combinning antennas you lose most of the
anti-interference advantages of the directional nature of antennas.

Still worth a try, though.

A splitter would lose 3 dB of power on each leg (minus any interference
effects). He seems to be saying these are different channels for the different
directions. He needs a filter type combining system.

 

[Don Pearce]

On Mon, 17 Jan 2005 15:55:10 +1000, Rodney Josey
<rjosDIESPAM@dodo.com.au> wrote:

If I've posted to the wrong NG for this then please advise...

Does anyone know if there is such a thing as a 'diplexer' for combining two UHF antenna's each
pointing in different directions into a single cable prior to being input into an antenna amplifier
?

I have need of 2 x UHF antennas - main one facing north for 4 free-to-air channels & a secondary one
facing to the south for a separate single free-to-air channel. Now I can get a 'diplexer' for
combining a VHF antenna plus a UHF antenna into a single cable which on taking one apart shows that
the VHF side stripline resistive load is different than that used on the UHF side - so NO GO for
using such a 'diplexer' when I need to combine 2 x UHF cables together into the one cable feeding
into the input of an external aerial amplifier.

Any ideas on what I could do to get this ?

Oz-Rod

What you need is not a diplexer, which operates on different
frequencies, but a simple UHF splitter, as you would use to feed a
single antenna to two TVs. This will provide the function you need. A
disadvantage is that by combinning antennas you lose most of the
anti-interference advantages of the directional nature of antennas.

Still worth a try, though.

d

Pearce Consulting
http://www.pearce.uk.com