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: Prev 1 [2]   Go Down
  Print  
Author Topic: Rope Length for Supporting Dipole Legs  (Read 2243 times)
N4NYY
Member

Posts: 4807




Ignore
« Reply #15 on: October 01, 2011, 07:16:38 PM »

Quote
But a bit of geometry will give the answer.  Clearly it has to be more than twice the height of the mast.

Amen. I used the pythagorean formula to figure out how long I had for dipole legs. I can get to 80, but not to 160M. I may have to look at loading for 160M.
Logged
KL3HY
Member

Posts: 119




Ignore
« Reply #16 on: October 04, 2011, 08:37:40 AM »

I hadn't been thinking so much about the ability to lower the antenna.  It does seem pretty obvious that the rope needs to be significantly longer than the mast, as G0GQK so helpfully hinted at.  I was mainly wondering how far should the wire end be kept from the metal mast.

I'm glad the ability to lower the antenna came up--that's honestly something I hadn't even considered.

Thanks,
Mike
Logged
G3RZP
Member

Posts: 4742




Ignore
« Reply #17 on: October 04, 2011, 08:49:18 AM »

I would always recommend having enough rope for a 'endless halliard, so if the antenna breaks, you don't have the problem of getting the end of the halliard down. A couple of feet between the support and the antenna is usually adequate, even at 1500 watts. If you have 1500 watts and a relatively small antenna on 500 kHz or 136 kHz, it can be a different matter.
Logged
Pages: Prev 1 [2]   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!