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: multi-band vertical  (Read 1324 times)
KF7ZCH
Member

Posts: 13




Ignore
« on: March 25, 2013, 07:48:30 PM »

I am planning on making a coax trap vertical for the 10, 15, 20, 30, 40 m bands.  The antenna will be about 7 feet from a two story house.  I am planning on having two radials per band giving a total of ten.  However, where I am installing them would only permit me to have them in basically the same orientation.  I am putting it a part of the yard which is surround by walls and concrete, thus I can only put the radials in about a 5 feet by 100 feet section.  Will the antenna still work, and if so how well?
Logged
K1WJ
Member

Posts: 455




Ignore
« Reply #1 on: March 26, 2013, 09:00:08 AM »

How high will antenna be?

Ground mounted allows you to put as many radials & length that will fit.

If elevated 2 feet or higher at base of antenna, one 1/4w radial per band will work, even if all all on the same side, fan out a few inches from each other.

73 K1WJDavid
Logged
KQ6Q
Member

Posts: 976




Ignore
« Reply #2 on: March 26, 2013, 02:12:56 PM »

the antenna setup you described will work, but it will be directional, toward the radials extended from the antenna. don't expect much in other directions.
Logged
KF7ZCH
Member

Posts: 13




Ignore
« Reply #3 on: March 26, 2013, 02:15:09 PM »

Thank you for the tips and suggestions.  They are much appreciated
Logged
K1WJ
Member

Posts: 455




Ignore
« Reply #4 on: March 27, 2013, 09:30:50 AM »

I have a 20m vertical with one elevated 20m 1/4w radial 4ft off the ground.
The radial is to the east side, make just as many contacts to the west.
73 K1WJ David
Logged
M6GOM
Member

Posts: 909




Ignore
« Reply #5 on: March 27, 2013, 10:06:52 AM »

the antenna setup you described will work, but it will be directional, toward the radials extended from the antenna. don't expect much in other directions.

The difference will be around 6dB or 1 S point in the quadrants where no radials are. It should still hear plenty in that direction, just not as good as it could've done i.e a signal which would've been S7 had there been radials will be around S5-6.
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!