Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net

   Home   Help Search  
Pages: [1]   Go Down
  Print  
Author Topic: Would this work? (J-pole antenna)  (Read 853 times)
CTHAM
Member

Posts: 40




Ignore
« on: April 24, 2009, 09:20:39 PM »

I live at a apartment in which I can't mount any antenna onto the brick surface also I'm on the first floor and my window is about 11 Ft off the ground.

I was thinking about since I need to get a window A/C unit I can mount some type of antenna so I can use a antenna without me having to hang myself out the window just to use my HT. This building is concrete and metal so very little if anything is able to reach outside.

However one issue I have is my screen is a swing out screen.. I'd like to use 2 meter J-pole for APRS but how can I mount it without it risking falling over? I was thinking drilling the new window A/C and using U-bolts?

Or maybe some type of Mag mount antenna?
Logged
VY1DM
Member

Posts: 2




Ignore
« Reply #1 on: April 25, 2009, 03:53:05 PM »


If the case of the AC is steel, and the size is bigger than ~18" square, a 1/4 mag mount should work off it directly.

If it's smaller than that, but has a steel case, what about two mag mounts on the side of the AC case, one above the other, to the 'cold' end of the J pole?

 Thus    |
         |
         | |
         | |
         | |
         |_|
         |
         |
         O  - mag mount
         |
         |
         O  - mag mount
         |

Logged
CTHAM
Member

Posts: 40




Ignore
« Reply #2 on: April 25, 2009, 05:37:00 PM »

hmmm well the height of the unit is 12.5" and the width is 18.5" I have to double check to make sure the body of the A/c will clear the swing out screen or that would be a issue of the A/C not being wide enough so the antenna would never clear the screen.

And for the mag mount what is keeping the j-pole secure? it has to at least pass a 25mph gust.
Logged
K4JC
Member

Posts: 76




Ignore
« Reply #3 on: May 04, 2009, 11:08:54 AM »

As long as the case of the AC unit is metal (steel or other material a magnet will stick to) just put a 5/8 wave mag mount on it. Even a small window AC unit should provide enough of a ground plane for the antenna to work. Plus a 5/8 wave will give you a bit of gain. You won't set any VHF distance records, but at least your antenna will be outside!
Logged
WB4LFC
Member

Posts: 7




Ignore
« Reply #4 on: May 06, 2009, 12:21:41 AM »

I would go with K4JC's suggestion.I have tried this while on vacation in a condo and it worked great.
Logged
K4CAV
Member

Posts: 152




Ignore
« Reply #5 on: May 06, 2009, 08:04:12 PM »

I agree with K4JC. Ditch the J-pole and go with a 5/8 wave mag mount. I don't understand the screen issue. Can you do away with the screen now that you have a window AC unit and mount the antenna on top?
If not, you mention that the window is 11' above ground, you could just mount the antenna to the bottom of the AC unit.

K4CAV / Jim
Logged
CTHAM
Member

Posts: 40




Ignore
« Reply #6 on: May 07, 2009, 07:03:51 AM »

The screen is not a up/down screen it's one that swings out..

the screen would be resting on the back part of the AC unit

I was going to get the arrow jpole
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!