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UHF + UHF Antenna Diplexer

R

Rodney Josey

Jan 1, 1970
0
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
 
D

Don Pearce

Jan 1, 1970
0
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
 
G

gwhite

Jan 1, 1970
0
Don said:
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.
 
D

Don Pearce

Jan 1, 1970
0
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.

If he is trying to combine two similar frequencies, and unwilling to
spend tens of thousands on a waveguide combiner, the it is certain he
will have as much loss from a diplexer as from a splitter. Anyway,
provided the signal is decent on both antenna, 3dB of loss is rarely a
problem. I have a 1dB attenuator pad in my antenna cable.

d

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

Don Pearce

Jan 1, 1970
0
If he is trying to combine two similar frequencies, and unwilling to
spend tens of thousands on a waveguide combiner, the it is certain he
will have as much loss from a diplexer as from a splitter. Anyway,
provided the signal is decent on both antenna, 3dB of loss is rarely a
problem. I have a 1dB attenuator pad in my antenna cable.

d

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

Oops - make that 10dB.

d

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