Such a thing as a GH/Yagi Hybrid? - Canadian TV, Computing and Home Theatre Forums

darexl · 2012-07-05, 04:46 PM

A question out of topic a bit.
Do you know if anybody experimented with GH-Yagi hybrid antenna?
I mean somethin like Yagi in mounting but with all directors and reflector built as classic GH (or possibly as ZZ4)?

ota_canuck · 2012-07-05, 05:56 PM

Do you mean something like this but with a GH/SSH instead of the dipole?

300ohm · 2012-07-06, 10:56 PM

I've played around with directors for the GH. (that's how I discovered the NAROD, heh) It seems like the best directors for the GH is another GH element, and you need like 5 to make a noticeable difference in gain. This of course makes the build fairly difficult and pricey.

darexl · 2012-07-08, 09:13 PM

Thanks for quick answer guys.
Yes, something like that. I tried to build it with 3 GH elements (classic 7") but of course with 3, my reception did not improve much. Yes, it is a lot of work and it is difficult to keep consistent in construction. I used 2.5" spacing between elements and 5" from active element to reflector (aiming for real channel 23 - ION is a bit elusive in Hamilton area).
In spite of construction, size and cost issues, I wonder if there is a potential here?

Damon Hill · 2012-07-08, 11:11 PM

Here's a Yagi design that kind of suggests what you're thinking of:

http://ronsmithaerials.com/catalogue/menu.html

Also, a "grid Yagi" sounds similar:

http://home.comcast.net/~ross_anderson/GridYagi.htm

Though both would have terrible wind and ice loading!

--Damon, who is having a terrible time finding SMA connectors and cables locally so he can finish a quad curtain antenna

darexl · 2012-07-09, 04:59 PM

Thanks,
I am allowed to play with attic only

so environment is not an issue
Mounting of 10 or more GH elements 2.5" apart on the other hand could cause a bit of a challenge

zdcyclops · 2012-08-04, 08:36 PM

I had sort of the same idea except to make the antenna bi- directional with UHF on the front side and VHF on the rear with its own down lead and an AB switch to pick which side you used. Is this workable or would a set of elements behind the reflector/directors fudge the gain on the front side?

300ohm · 2012-08-04, 11:04 PM

Quote:

to make the antenna bi- directional with UHF on the front side and VHF on the rear

Actually, you can do that now WITHOUT the A-B switch with the original GH with straight NARODs for a range of about 3 vhf-hi channels.

http://www.digitalhome.ca/forum/showthread.php?t=99907

Notice the channel 7 and 8 gain is stronger on the backside for the 28" straight NAROD.

UHF gain from the front and VHF-hi gain from the rear could be further optimized on it, but there hasn't really been any demand for it.

2012-07-05, 04:46 PM	#1
darexl Rookie Join Date: Jul 2011 Location: Hannon, Ontario Posts: 3	Such a thing as a GH/Yagi Hybrid? A question out of topic a bit. Do you know if anybody experimented with GH-Yagi hybrid antenna? I mean somethin like Yagi in mounting but with all directors and reflector built as classic GH (or possibly as ZZ4)?

2012-07-05, 05:56 PM	#2
ota_canuck Veteran Join Date: Mar 2009 Location: Dunnville, Ontario on the Grand River, North shore Lake Erie Posts: 2,405	Do you mean something like this but with a GH/SSH instead of the dipole? __________________ 3D SSH III with ZZ4 refl. http://imageshack.us/user/jmsdigital

2012-07-06, 10:56 PM	#3
300ohm Veteran Join Date: Mar 2008 Location: Somewhere in Delaware on the flat side Posts: 7,002	I've played around with directors for the GH. (that's how I discovered the NAROD, heh) It seems like the best directors for the GH is another GH element, and you need like 5 to make a noticeable difference in gain. This of course makes the build fairly difficult and pricey. __________________ My builds/plans (not the latest models) are located here.

2012-08-04, 08:36 PM	#7
zdcyclops Rookie Join Date: Sep 2011 Posts: 1	Great minds think a like I had sort of the same idea except to make the antenna bi- directional with UHF on the front side and VHF on the rear with its own down lead and an AB switch to pick which side you used. Is this workable or would a set of elements behind the reflector/directors fudge the gain on the front side?

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2012-07-08, 09:13 PM	#4
darexl Rookie Join Date: Jul 2011 Location: Hannon, Ontario Posts: 3	Thanks for quick answer guys. Yes, something like that. I tried to build it with 3 GH elements (classic 7") but of course with 3, my reception did not improve much. Yes, it is a lot of work and it is difficult to keep consistent in construction. I used 2.5" spacing between elements and 5" from active element to reflector (aiming for real channel 23 - ION is a bit elusive in Hamilton area). In spite of construction, size and cost issues, I wonder if there is a potential here?

2012-07-08, 11:11 PM	#5
Damon Hill Rookie Join Date: Oct 2009 Posts: 15	Here's a Yagi design that kind of suggests what you're thinking of: http://ronsmithaerials.com/catalogue/menu.html Also, a "grid Yagi" sounds similar: http://home.comcast.net/~ross_anderson/GridYagi.htm Though both would have terrible wind and ice loading! --Damon, who is having a terrible time finding SMA connectors and cables locally so he can finish a quad curtain antenna

2012-07-09, 04:59 PM	#6
darexl Rookie Join Date: Jul 2011 Location: Hannon, Ontario Posts: 3	Thanks, I am allowed to play with attic only so environment is not an issue Mounting of 10 or more GH elements 2.5" apart on the other hand could cause a bit of a challenge