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HDTV, Satellite & Cable Forum - View Post
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11/18/09 - A major update brings our collection to over 1,350 manuals for 115 brands.
11/04/09 - New features, hundreds of 2-way and RS-232 modules, plus a web browser for the MX-6000.
9/04/09 - Latest activity-based model features a color screen at an economical price.
9/03/09 - * OK, one string – you may have to learn something!
8/22/09 - As it turns out, those who do not learn from history... still won't repeat it.
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Aiming an 8 Bay Multidirectional Antenna
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| Topic: | Aiming an 8 Bay Multidirectional Antenna This thread has 5 replies. Displaying all posts. |
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| Post 1 made on Saturday November 7, 2009 at 03:14 |
enew New Member |
Joined:
Posts: | November 2009
2 |
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I currently have a 4 bay antenna, although I'm quite pleased with my reception in Toronto. However, thinking things can always improve, I've just bought an 8 Bay multidirectional antenna (Digiwave 7287) that has the ability to rotate its two sides towards each other. However, there were no instructions regarding how much to angle the two sides towards each other. Would I position each bay to face each of the two primary transmitters (e.g. CN Tower and Grand Island) or just leave it flat without angling the bays, essentially just doubling the surface area from my old antenna?
Many thanks for your input.
Ed
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| Post 2 made on Saturday November 7, 2009 at 08:24 |
hd fan Regular Member |
Joined:
Posts: | March 2006
270 |
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Welcome. The funny thing is with digital it does not matter how much you improve it since the PQ and AQ is going to stay the same. Talk to the vendor or the manufacturer they might have information that at least I am not aware of.
The best case scenario by stacking 2 equal antennas in the same direction is to improve gain by close to 3 dB or in other words double the power level. Theory regarding combining antennas in different directions is quite complicated and practically hardly ever used. Any phase shifting will compromise the result signal rather than help. Two signals coming from different directions will more likely be out of phase therefore the end result will be a reduced signal. But heck , what do I know, like I said maybe the vendor/manufacturer combo knows better.
They essentially are reliaying on the trial and error capabilities of their customers and the fact that in most markets there are not too many digital TV stations and more likely there are a few that at least you are not going to be interested in. Maybe you are lucky to point them in a way that the Stations heavily affected do not interest you , and the rest of the pack although it gets affected , at least not to the point to loose signal.
The pro advice would be to have a rotor with a single antenna rather than this monster or frankenstein creation. Funny that only chineese are bulding this ones while the major antenna historical manufacturers have none of this. I just wonder why eh?
Or, as usual, maybe I am wrong? ........
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| Post 3 made on Saturday November 7, 2009 at 10:33 |
enew New Member |
Joined:
Posts: | November 2009
2 |
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Wow, thanks for the input.
I'm hoping the upgrade will result in more reliability in heavy weather as opposed to better picture as there are a couple of US stations that I receive at 1-2 "bars" of "signal strength" on my TV. I'm hoping I can stop those stations from being dropped in heavy weather.
As far as installing the antenna, my plan is to: 1) initially install it without angling the bays toward each other and just rotate the flat antenna on its rooftop mast until I get the best signal strength and then 2) angle the 2 bays toward each other to see if signal strength improves.
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| Post 4 made on Saturday November 7, 2009 at 10:59 |
BillFromGI Regular Member |
Joined:
Posts: | March 2009
73 |
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On November 7, 2009 at 10:33, enew said...
As far as installing the antenna, my plan is to: 1) initially install it without angling the bays toward each other and just rotate the flat antenna on its rooftop mast until I get the best signal strength and then 2) angle the 2 bays toward each other to see if signal strength improves.
You may have better luck aiming the bays away from each other as opposed to aiming them towards each other. Hope that makes sense.. . And, as HD Fan pointed out, this antenna, as novel as it looks and is designed, is basically a "crapshot". I can see what the designer was thinking when they put this product out, but when you start "pointing the bays", you add or subtract to the incoming signal. If you have time on your hands and are willing to experiment, you just might get this antenna to work for you. Start by aiming the bays as you stated (one @ CN Tower, other at GI) and work from there. Good luck.. .
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| Post 5 made on Friday November 20, 2009 at 21:42 | ...it's new! |
fogducker New Member |
Joined:
Posts: | October 2009
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I had the Digiwave CM4221 clone and was able to get all the US stations but not the Canadian except for CBC so switched to the same antenna you have. One antenna is pointed in the same direction as my previous CM4221 clone and the other at an angle to hit the CN Tower. It brings in some of the Canadian channels but not in high def and I assume they not digital as the image is pretty poor with a lot of snow.
I think this is more of a reflection of the Canadian signals being weak than the antenna being of poor design.
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| Post 6 made on Friday November 20, 2009 at 23:29 | ...it's new! |
Daniel Tonks Wrangler of Remotes |
Joined:
Posts: | October 1998
25,811 |
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Or it could be the standard problem with trying to combine two antennas pointing in different directions. It can work, or it can make things worse.
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