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user name 30-Jun-2018 6:46 PM

Combining tv antennas
 
my plot is

http://www.tvfool.com/?option=com_wr...9038eeccf587af

having problem with channel 28. Signal is 50 to 65 in strength.

When attaching tv antennas, should they be attached in a "series", not parallel?

rabbit73 1-Jul-2018 3:11 AM

1 Attachment(s)
Hello, user name

Thanks for the signal report.

Quote:

having problem with channel 28. Signal is 50 to 65 in strength.
Is that WFPA? It is one of your weaker channels. What are you measuring the strength with? What do your good channels measure? Are you using a preamp?
Quote:

When attaching tv antennas, should they be attached in a "series", not parallel?
The title for your thread says combining, but your question says attaching.

What two antennas are you attaching, and why do you want to attach them?

There are many ways of attaching antennas. Do you mean attaching them to the mast or do you mean connecting the coax cables together?

I see a lot of trees in your area that can block TV signals. Are there trees in the signal path from channel 28?

http://forum.tvfool.com/attachment.p...6&d=1530455531

Please tell us more details so that we can give you good advice.

user name 3-Jul-2018 8:39 PM

2 large uhf antennas using coax
maybe 3 large uhf antennas using coax if necessary
trying to combine antennas, using coax, to increase overall gain.
using digital to analog converter box to find signal strength
strong stations such as channel 6 are ok
I and antennas are in the attic

Tower Guy 3-Jul-2018 9:05 PM

http://www.hdtvprimer.com/antennas/ganging.html

Read the above link. Perhaps it will help understand stacking antennas.

user name 7-Jul-2018 3:26 PM

so combining antennas in series ............
 
So combining antennas in series won't work?
Combining must always be done in parallel?

rabbit73 8-Jul-2018 2:30 AM

Quote:

Originally Posted by user name (Post 60001)
So combining antennas in series won't work?
Combining must always be done in parallel?

I know how to connect batteries or resistors in series or parallel, but I don't know what you mean by connecting antennas in series or parallel.

I can't answer you question until I know what you mean by connecting antennas in series or parallel.

Can you draw a diagram to show us what you mean?

You can combine two IDENTICAL UHF antennas aimed in the SAME direction with a splitter in reverse for more gain; the two coax lines from the antennas to the splitter must be the SAME length.

rickbb 12-Jul-2018 8:48 PM

Or you could buy a large high gain antenna like the DB8e.

Nascarken 14-Jul-2018 11:50 AM

No just go with a king Jack it will out perform that hi price lol
With a built-in sign finder 32dbg.And it's not just uhf?
It all so a hi&low band Vhf.That receive ATSC,03
Come on antennas Direct marketing just uhf tv antennas
Like the 91 XG,IS THE BEST ANTENNA TOO BUY!!WHEN IT COMES
TOO UHF?BROADCASTING TOWER'S,WITH A CHANNEL MASTER 7777AMP
YOU WILL RECEIVE WITH THE ANTENNAS DIRECT 91XG,90miles with it
And less of a wind sail.And a better price and free shipping and don't forget
The tilt feature on that 91,too get them broadcasting tower's this antenna
Will OUT performan the Db8,all the way around.lol no stacking boy that is a lot of money
For DB'8'S .ps I suggest that the trees are a problem that is why I suggest the 91,
And get the ANTENNA up about 40ft off the roof linen or get a chainsaws lol
And the Db8,is not a good idea

user name 14-Jul-2018 3:11 PM

ant - ant - tv = series

ant
|--tv = parallel
ant

rabbit73 14-Jul-2018 5:35 PM

Quote:

Originally Posted by user name (Post 60029)
ant - ant - tv = series

ant
|--tv = parallel
ant

I see the words, but I can't picture it.

This is the only way I know how to do it:

https://i.imgur.com/zY9iOto.jpg

The above method uses off-the-shelf parts, but there is also a lowest-loss method for an additional 0.5 dB gain, and it requires special DIY connections.

Nascarken 15-Jul-2018 1:16 AM

It's for all stacking up ANTENNAs
 
Quote:

Originally Posted by rabbit73 (Post 60030)
I see the words, but I can't picture it.

This is the only way I know how to do it:

https://i.imgur.com/zY9iOto.jpg

Whether it's db8 or 91 XG iT's the only way too
Put 2 of the same antennas together!!
In less you have an amp with 2uhf in then
It you can do it that way too.
Good luck 3,Feet apart frum one another
And see if you can adjust the ANTENNA to a 35,DGAGL
Will all so help out with your receive.

Nascarken 16-Jul-2018 8:06 PM

I believe user name for the stacked antennas is HighTower ?
And like's too start trouble on an OTHER form,telling people that
He is going to cut their RG11,CABLE Rabbit pleas don't
Help this person out thank you.

rabbit73 16-Jul-2018 10:23 PM

Quote:

Originally Posted by Nascarken (Post 60032)
I believe user name for the stacked antennas is HighTower ?
And like's too start trouble on an OTHER form,telling people that
He is going to cut their RG11,CABLE Rabbit pleas don't
Help this person out thank you.

Um, user name for this thread is in Wallingford, PA; HighTower on the other forum is in Fresno, CA.

I don't think HighTower will actually cut your RG11 coax; he is just giving you a hard time. Ignore him, please.

The poster that started this thread is user name. He is having a difficult time describing his reception problem and only gives short answers. I am finding it difficult to understand him, but I am doing the best I can to help him.

rabbit73 16-Jul-2018 10:35 PM

1 Attachment(s)
Quote:

Originally Posted by user name (Post 60029)
ant - ant - tv = series

ant
|--tv = parallel
ant

This is a method of connecting two antennas in parallel for more gain. It gives the most gain for two antennas, but it isn't easy to do.

http://forum.tvfool.com/attachment.p...7&d=1531780500

This method is used by Calaveras of AVS for his two 91XGs.
http://www.aa6g.org/DTV/index.html

https://i.imgur.com/EWH9LI1.jpg

https://i.imgur.com/BQ6FLNV.jpg

rabbit73 16-Jul-2018 11:23 PM

1 Attachment(s)
This would be one way to connect two antennas in series, but it is not a good idea.

http://forum.tvfool.com/attachment.p...9&d=1531784332

RF Steve 17-Jul-2018 12:43 AM

rabbit 73 correct me if I am wrong. One could build an open line feed harness between two antennas, or use ladder line. Placing the balun at the center point between the antennas. While I've not yet tried such an array. I plan to to try such an array in the near future. While most TV antenna stacking is done horizontally, stacking vertically will give different results, but in some cases could work better.
73 Steve KC7---

rabbit73 17-Jul-2018 3:25 AM

Hello, Steve

Yes, it can be done that way. The hard part is determining the impedance of the open-wire lines from each antenna to the combining point so that when they are connected in parallel, you have 300 ohms for the balun. Forum member holl_ands on AVS and digitalhome.ca does modeling; he might be able to help you with that. He has worked out an open-wire harness to combine the two 4-bay antennas of the CM4228HD, which he calls the HHH.

https://imageevent.com/holl_ands/mul...dshorizharness

Quote:

While most TV antenna stacking is done horizontally, stacking vertically will give different results, but in some cases could work better.
Horizontal stacking reduces the horizontal beamwidth, but maintains the same vertical beamwidth of one antenna. Vertical stacking maintains the same horizontal beamwidth of one antenna, but reduces the vertical beamwidth.

73
W4...
ex-W2...
ex-DL4..

Nascarken 17-Jul-2018 10:42 AM

Vertical in the US does not work so if you don't want too be back on the roof
For get that open line feed with all the new stuff out there to day why!! Would
You it's a waste of time and one big mess I will stick with the T they work so well
Better than a combines.

ADTech 17-Jul-2018 11:09 AM

Quote:

Vertical in the US does not work
You're confusing vertical polarization with vertical stacking of separate antennas. Different animals. Two bay, four bay, and eight bay antennas are all examples of antennas that include a vertical stacking of elements.



FWIW, many US stations who did not previously do so will be adding a vertical component to their signal to create either circular or elliptically polarized broadcast signals. In those specific cases, an antenna rotated so that it is vertically polarized will, in fact work just fine. However, since the default polarization of all TV broadcast signals is required by regulation to be horizontally polarized, the default polarization of the receiving antenna should also be horizontal.


Quote:

Horizontal stacking reduces the horizontal beamwidth, but maintains the same vertical beamwidth of one antenna. Vertical stacking maintains the same horizontal beamwidth of one antenna, but reduces the vertical beamwidth.
This is the correct description of the behavior that results from the two commonly executed types of stacking.

Nascarken 17-Jul-2018 12:55 PM

Yes it's for the brodband? Not sure but not for regular broadcasting?


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