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Connecting 2 antennas ?

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Archived from groups: alt.tv.tech.hdtv (More info?)

 

I need to connect 2 antennas to one coax line to my receiver.Do I just buy a
splitter or is there some other piece of hardware needed ? Thanks

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Archived from groups: alt.tv.tech.hdtv (More info?)

 

"Apothecon" <sailer.ny@netzero.net> wrote in
news:1095251279.+8ZUAQU90degMomIZvNhJw@teranews:

> I need to connect 2 antennas to one coax line to my receiver.Do I just
> buy a splitter or is there some other piece of hardware needed ?

Unless they are working together as an array, this is a bad idea. You see
each antenna will be providing a signal, but unless they are very carefully
matched and phased, the two signals are just as apt to fight one another as
they are to reinforce. Moreover, it usually only works well for the one
channel that you design the array for. It is much better to introduce some
switching and just switch antennas as needed. Even there, you need to get
good switches that are reasonably free of impedance bumps, or the switch
will reflect more signal back to the antenna than it passes to the TV.

--
Dave Oldridge+
ICQ 1800667

A false witness is worse than no witness at all.

Reply to Anonymous

Archived from groups: alt.tv.tech.hdtv (More info?)

 

You do have to be careful with multipath, etc. I have two antennas joined,
but my "second" antenna is for a specific channel, so I use a Channel Master
Join-tenna (channel 12), which passes only one channel through one input,
rejecting all others, and passing all channels except 12 through the other.
This works out real well since it rejects the multipath/reflections from my
"second" antenna that would normally interfere with the signal from the
primary antenna. This gets real complicated, however, if you wish to receive
multiple channels from each antenna.

If you do just join two antennas with a generic splitter/joiner, you are
likely to be making lots of trips up to the roof to tweak your antenna
positioning, and you may not be able to find positions where all of the
desired channels can be received with acceptable signal strength. Good luck.

Phil

"Dave Oldridge" <doldridg@leavethisoutshaw.ca> wrote in message
news:Xns9565496B0264Adoldridgsprintca@24.71.223.159...
> "Apothecon" <sailer.ny@netzero.net> wrote in
> news:1095251279.+8ZUAQU90degMomIZvNhJw@teranews:
>
>> I need to connect 2 antennas to one coax line to my receiver.Do I just
>> buy a splitter or is there some other piece of hardware needed ?
>
> Unless they are working together as an array, this is a bad idea. You see
> each antenna will be providing a signal, but unless they are very
> carefully
> matched and phased, the two signals are just as apt to fight one another
> as
> they are to reinforce. Moreover, it usually only works well for the one
> channel that you design the array for. It is much better to introduce
> some
> switching and just switch antennas as needed. Even there, you need to get
> good switches that are reasonably free of impedance bumps, or the switch
> will reflect more signal back to the antenna than it passes to the TV.
>
> --
> Dave Oldridge+
> ICQ 1800667
>
> A false witness is worse than no witness at all.
>

Reply to Anonymous

Archived from groups: alt.tv.tech.hdtv (More info?)

 

"Phil Ross" <paross@pacbell.net> wrote in
news:hHY1d.15870$QJ3.11153@newssvr21.news.prodigy.com:

> You do have to be careful with multipath, etc. I have two antennas
> joined, but my "second" antenna is for a specific channel, so I use a
> Channel Master Join-tenna (channel 12), which passes only one channel
> through one input, rejecting all others, and passing all channels
> except 12 through the other. This works out real well since it rejects
> the multipath/reflections from my "second" antenna that would normally
> interfere with the signal from the primary antenna. This gets real
> complicated, however, if you wish to receive multiple channels from
> each antenna.

Yes....it can be done, of course, by using multiplexers like the ones
cable companies use at their head ends (though that technology is mostly
gone now, in favour of satellite downlinks).

> If you do just join two antennas with a generic splitter/joiner, you
> are likely to be making lots of trips up to the roof to tweak your
> antenna positioning, and you may not be able to find positions where
> all of the desired channels can be received with acceptable signal
> strength. Good luck.

Exactly....and you may even find that with a strong signal from each
antenna on a particular channel, you end up with a weak one in the
combination, until you move the antennas around some...

Like I said, I tend to prefer a switch, except for stacked single channel
arrays.



--
Dave Oldridge+
ICQ 1800667

A false witness is worse than no witness at all.

Reply to Anonymous

Archived from groups: alt.tv.tech.hdtv (More info?)

 

On Wed, 15 Sep 2004 08:27:57 -0400, "Apothecon"
<sailer.ny@netzero.net> wrote:

>I need to connect 2 antennas to one coax line to my receiver.Do I just buy a
>splitter or is there some other piece of hardware needed ? Thanks
>

Here's a guy who gives tips on how he did it with 2 silver sensor
indoor antennas. It's not exactly what you want to do but it gives you
a good start at what to be careful for. seems like he used a 2-1
splitter and an amplifier

http://www.hdtvprimer.com/ANTENNAS/silver.html

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