Stacking three A99`s

[murdog]

Have to put up a new pole and have the antenna`s laying around , pole will be about seventy feet high and made of wood so stand off`s would be a foot or two .
Cottage is at 4200 feet out west .

 

[fourstringburn]

Stacking 3 A99's??? Horizontally?

I would put them in phase with each other (1/2 wavelength apart on it's own masts) vertically with lots of ground radials.

 

[murdog]

Stacking 3 A99's??? Horizontally?

I would put them in phase with each other (1/4/ wavelength apart on it's own masts) vertically with lots of ground radials.

Yes vertical

 

[fourstringburn]

Sounds ridiculous to me. Maybe it's a new concept I haven't heard of.

A phased antenna array would give you beam like gain and you have the antennas to do it.

Maybe you can explain what 3 stacked vertical antennas would do.

 

[Captain Kilowatt]

Properly done with the proper spacing and phase angles it would yield an omni with higher gain and lower TOA however stacking three A99s is not at all practical.

 

[fourstringburn]

proper spacing

That's what I was referring to about stacking 3 A99's vertically being ridiculous. At 72 ft, there wouldn't be enough spacing between all 3 antennas yet barely 2 antennas.This would cause phase cancellations.

 

[Captain Kilowatt]

You can play with the phase angles to some degree (no pun intended ) to allow for what you want to achieve. Spacing can be adjusted outside the generally accepted 1/4 wave multiples. A good setup is 1/4 wave spacing with 135 degree phasing. In any event I am talking about slacing horizontally and not vertically. A99s vertically spaced is borderline crazy.

 

[Blackcat630]

Sell 2 keep one. Take proceeds from 2 sold a99s put toward building/buying a BEAM. Mount beam horizontal w a99 above. Done.....just my. 02

 

[murdog]

Sell 2 keep one. Take proceeds from 2 sold a99s put toward building/buying a BEAM. Mount beam horizontal w a99 above. Done.....just my. 02

All ready have two horizontal beams and one five element quad....yes three towers just try`n to use up the extra a99`s.

 

[Blackcat630]

All ready have two horizontal beams and one five element quad....yes three towers just try`n to use up the extra a99`s.

Didn't realize you were working with an 11 meter antenna farm Have some fun and experiment...after all that's what's it all about.

 

[Captain Kilowatt]

All ready have two horizontal beams and one five element quad....yes three towers just try`n to use up the extra a99`s.

Sell all of them and use the money to take the wife out for a nice evening. It will pay dividends the next time you want another antenna. LOL

 

[murdog]

Sell all of them and use the money to take the wife out for a nice evening. It will pay dividends the next time you want another antenna. LOL

That is just at the cabin Captain more around here at home ....the wife went south with the dog years ago so just house keepers for now on ...but get the drift !!! .

 

[murdog]

Didn't realize you were working with an 11 meter antenna farm Have some fun and experiment...after all that's what's it all about.

Oh it`s not just an 11 meter farm have wire up and lots of it for all the hf bands ...it`s all a hobby and fun .

 

[Road Squawker]

[QUOTE="murdog, post: 549648, member: 7163" just try`n to use up the extra a99`s.[/QUOTE]
put one of them on top of your tallest tower,,,, they make great lightin rods and will save your real antennas.......

splatters that fiberglass into millions of pieces

 

[Captain Kilowatt]

[QUOTE="murdog, post: 549648, member: 7163" just try`n to use up the extra a99`s.

put one of them on top of your tallest tower,,,, they make great lightin rods and will save your real antennas.......

splatters that fiberglass into millions of pieces[/QUOTE]


Agreed. I saw the after effects of a strike. It was mounted on the eve of a friends house. Besides blowing a hole in the roof and following the coax down to the kitchen where the radio was it blew half the cabinets off the kitchen walls and set the house on fire causing well over $30,000 damage. We never did find much more than some splinters and the metal mount that was bolted to the pipe.