Antennas Direct OTA Antennas & Gear - Page 28 - Canadian TV, Computing and Home Theatre Forums

be236 · 2012-04-10, 08:06 PM

Yes, basically that's it...

Asking for a comparison between M8 against 91XG for RFs 26 to 43...

Eg, would a 91XG have better gain to pick those channels up when my M8 cannot...

Jase88 · 2012-04-10, 08:12 PM

I highly recommend the XG-91 for DX reception. But even its exceptional performance can't overcome 107 miles across land; especially along the west coast. Even with a high elevation, extremely-low noise pre-amp, etc.

The best you could likely hope for is tropo, which is rare in your location.

be236 · 2012-04-10, 11:46 PM

But with my poorly built M8, I can now get 80% picture uptime on RF 20 and 22 at 107 miles away on NON-TROPO days.

So, I would hope that 91XG can get me the upper channels (RF 26 to 43) with similar reliablility...

ADTech · 2012-04-11, 12:39 PM

Quote:

Is not the AV7 a channel injector (3, 21 etc.) not a combiner?

It's the "AC-7", not an "AV-7" (darned big fingers, perhaps)

http://www.tinlee.com/MATV_headend.p...IGNALINJECTORS

Injecting or combining is pretty much the same thing in this instance.

threeflags · 2012-04-16, 03:51 PM

Question regarding wind resistance. I have a DB4e and was wondering if you would recommend using a J pole (either the long or short tube). I'm sure a tripod would work but I happen to come across someone throwing out a short J pole from a satellite mount. Mounting it on the roof peak somewhere in the middle of the span. What if I decide to turn 2 DB4e into a modded "DB8e"? Would that be too much of a wind profile?

Thank.

roger1818 · 2012-04-16, 04:55 PM

I don't recommended a J-Pole for anything larger than a 2 bay antenna, but YMMV.

Why are you not sure if a tripod would work? Other options better than a J-Pole are sloped roof mount, peak mount, eave mount and chimney mount.

ADTech · 2012-04-16, 06:56 PM

We've been selling the 30 and 40" J-mounts with the 2, 4, and 8-bay antennas for years. They do fine as long as the mount is properly anchored.

Having made my own "DB8e" in-house, I'd still put it on our 40" J-mount.

threeflags · 2012-04-16, 10:41 PM

Roger1818
It just that I have a spare J mount laying around.

ADTech
I didn't realize that you folks sold J mounts.

Much thanks.

roger1818 · 2012-04-17, 12:51 AM

I guess it depends on how much ice build up and wind you need to deal with. After seeing high tension power towers crumple due to ice load, I am a bit skeptical about the ability of a scrawny J-pole to hold up a big antenna.

threeflags · 2012-04-17, 10:32 AM

Yesterday ... a huge wind storm push through the area. Trees and power lines were toppled. The thing I don't like about the J pole mount is the small foot. I would be happy with a foot the size of a sheet of paper (8X10).

ADTech · 2012-04-17, 10:45 AM

I can tell you that in over three years of taking calls from customers, I haven't had a single report of a J-mount failure due to excessive loading during weather events. These things aren't made from tin foil, after all.

Look back at the earlier 18" DBS dish mounts and you'll see a similar (actually smaller) mount. How many of them failed due to loading?

stampeder · 2012-04-17, 10:54 AM

I've found that while the J-mounts themselves are nice and strong, the problems with wind and snow load are with how the base plate is attached to the home. I've seen some horribly weak and dumb installations out there!

threeflags, apart from the wind load question about the AD antenna the mounting issues are discussed in great detail in the following thread:

OTA Mounts, Towers, Rigging Hardware

tmp31416 · 2012-04-20, 02:50 AM

(i know this might be more appropriate for the mounting & rigging forum, but i'm not sure adtech hangs around that one)

adtech --

after discovering that one can use a j-mount to install a db8 on a roof (cannot use that tripod i bought last year, to my great chagrin), i recently stumbled onto some webstores that say your 1 metre j-mount (stm-1000) can be used with a 91xg. is this true?

thanks in advance.

ADTech · 2012-04-20, 01:49 PM

Sure, it can. The mast clamp only needs a couple of inches of a "pipe" for its mechanical connection. There are likely more appropriate choices, especially if you need more height, but it will work.

tmp31416 · 2012-04-20, 09:30 PM

ADtech --

thank you for the reply.
as long as the stm-1000 lets my 91xg clear my roof-line (my roof-peak?!? sp, anyone?), that's what counts.

i have seen photos of db-8s (or of another 8 bay antenna) attached to a j-mount on the web, which confirms no special precaution needs to be taken with such a combo. it always helps to see how others do things, to avoid making mistakes.

but i haven't found a photo of a 91xg mounted on an stm-1000 (or equivalent) in all my googling. again, it would be for example purpose.
does antenna direct (or anyone else) have such a photo?

cheers

2012-04-10, 08:06 PM	#406
be236 Join Date: Sep 2011 Location: Everett, WA Posts: 406	Yes, basically that's it... Asking for a comparison between M8 against 91XG for RFs 26 to 43... Eg, would a 91XG have better gain to pick those channels up when my M8 cannot... __________________ My Tvfool: http://www.tvfool.com/?option=com_wr...2df982d3f2a9b0

2012-04-10, 08:12 PM	#407
Jase88 Moderator Join Date: Jan 2009 Location: Kitchener, ON Posts: 4,113	I highly recommend the XG-91 for DX reception. But even its exceptional performance can't overcome 107 miles across land; especially along the west coast. Even with a high elevation, extremely-low noise pre-amp, etc. The best you could likely hope for is tropo, which is rare in your location. __________________ DMX 68' tower, HyGain HAM 5 rotator, Antennas Direct 91-XG & C5, Channel Master 7777 preamp, Siemens surge protection

2012-04-10, 11:46 PM	#408
be236 Join Date: Sep 2011 Location: Everett, WA Posts: 406	But with my poorly built M8, I can now get 80% picture uptime on RF 20 and 22 at 107 miles away on NON-TROPO days. So, I would hope that 91XG can get me the upper channels (RF 26 to 43) with similar reliablility... __________________ My Tvfool: http://www.tvfool.com/?option=com_wr...2df982d3f2a9b0

2012-04-16, 03:51 PM	#410
threeflags Join Date: Jan 2011 Location: Newmarket - North of Toronto Posts: 55	Question regarding wind resistance. I have a DB4e and was wondering if you would recommend using a J pole (either the long or short tube). I'm sure a tripod would work but I happen to come across someone throwing out a short J pole from a satellite mount. Mounting it on the roof peak somewhere in the middle of the span. What if I decide to turn 2 DB4e into a modded "DB8e"? Would that be too much of a wind profile? Thank. Last edited by threeflags; 2012-04-16 at 10:37 PM. Reason: grammar

2012-04-16, 04:55 PM	#411
roger1818 Veteran Join Date: Apr 2006 Location: Ottawa (Stittsville), ON, OTA (Radio Shack Omnidirectional Antenna and 5Y6S in Attic), MythTV HTPC Posts: 5,680	I don't recommended a J-Pole for anything larger than a 2 bay antenna, but YMMV. Why are you not sure if a tripod would work? Other options better than a J-Pole are sloped roof mount, peak mount, eave mount and chimney mount. __________________ Link to my TVFool results is in my profile Homepage URL. I suggest others do the same.

2012-04-16, 06:56 PM	#412
ADTech Join Date: Oct 2010 Location: Antennas Direct Tech Support - St Louis Posts: 219	We've been selling the 30 and 40" J-mounts with the 2, 4, and 8-bay antennas for years. They do fine as long as the mount is properly anchored. Having made my own "DB8e" in-house, I'd still put it on our 40" J-mount.

2012-04-16, 10:41 PM	#413
threeflags Join Date: Jan 2011 Location: Newmarket - North of Toronto Posts: 55	Roger1818 It just that I have a spare J mount laying around. ADTech I didn't realize that you folks sold J mounts. Much thanks.

2012-04-17, 12:51 AM	#414
roger1818 Veteran Join Date: Apr 2006 Location: Ottawa (Stittsville), ON, OTA (Radio Shack Omnidirectional Antenna and 5Y6S in Attic), MythTV HTPC Posts: 5,680	I guess it depends on how much ice build up and wind you need to deal with. After seeing high tension power towers crumple due to ice load, I am a bit skeptical about the ability of a scrawny J-pole to hold up a big antenna. __________________ Link to my TVFool results is in my profile Homepage URL. I suggest others do the same.

2012-04-17, 10:32 AM	#415
threeflags Join Date: Jan 2011 Location: Newmarket - North of Toronto Posts: 55	Yesterday ... a huge wind storm push through the area. Trees and power lines were toppled. The thing I don't like about the J pole mount is the small foot. I would be happy with a foot the size of a sheet of paper (8X10).

2012-04-17, 10:45 AM	#416
ADTech Join Date: Oct 2010 Location: Antennas Direct Tech Support - St Louis Posts: 219	I can tell you that in over three years of taking calls from customers, I haven't had a single report of a J-mount failure due to excessive loading during weather events. These things aren't made from tin foil, after all. Look back at the earlier 18" DBS dish mounts and you'll see a similar (actually smaller) mount. How many of them failed due to loading?

2012-04-17, 10:54 AM	#417
stampeder OTA Forum Moderator Join Date: Jan 2005 Location: North Delta, BC (96Av x 116St) Posts: 23,338	I've found that while the J-mounts themselves are nice and strong, the problems with wind and snow load are with how the base plate is attached to the home. I've seen some horribly weak and dumb installations out there! threeflags, apart from the wind load question about the AD antenna the mounting issues are discussed in great detail in the following thread: OTA Mounts, Towers, Rigging Hardware

2012-04-20, 02:50 AM	#418
tmp31416 Join Date: Jun 2011 Location: gatineau, pq /// db4 attic mount + hdp269 /// roof-top 91xg + hdp269 Posts: 61	q for adtech (i know this might be more appropriate for the mounting & rigging forum, but i'm not sure adtech hangs around that one) adtech -- after discovering that one can use a j-mount to install a db8 on a roof (cannot use that tripod i bought last year, to my great chagrin), i recently stumbled onto some webstores that say your 1 metre j-mount (stm-1000) can be used with a 91xg. is this true? thanks in advance.

2012-04-20, 01:49 PM	#419
ADTech Join Date: Oct 2010 Location: Antennas Direct Tech Support - St Louis Posts: 219	Sure, it can. The mast clamp only needs a couple of inches of a "pipe" for its mechanical connection. There are likely more appropriate choices, especially if you need more height, but it will work.

2012-04-20, 09:30 PM	#420
tmp31416 Join Date: Jun 2011 Location: gatineau, pq /// db4 attic mount + hdp269 /// roof-top 91xg + hdp269 Posts: 61	ADtech -- thank you for the reply. as long as the stm-1000 lets my 91xg clear my roof-line (my roof-peak?!? sp, anyone?), that's what counts. i have seen photos of db-8s (or of another 8 bay antenna) attached to a j-mount on the web, which confirms no special precaution needs to be taken with such a combo. it always helps to see how others do things, to avoid making mistakes. but i haven't found a photo of a 91xg mounted on an stm-1000 (or equivalent) in all my googling. again, it would be for example purpose. does antenna direct (or anyone else) have such a photo? cheers

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