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: Possible to remotely locate a 20m beam antenna?  (Read 359 times)
KC9KEP
Member

Posts: 208


WWW

Ignore
« on: September 23, 2009, 08:26:34 AM »

Hello!

I'm not sure how to articulate my question .. but here goes ..

I am considering mounting a 20m Moxon antenna on
my garage in my back yard.  

My house is about 80 feet from the garage.
I would need to run coax from the Moxon to my
house where my "shack" is.

I'd assume that my primary challenge would to be minimize
cable losses.

Does this seem at all workable?  Would I just seek the
lowest loss 50 ohm cable such as RG8X or similar?

Thank you for any and all comments :-)
Logged
WB6BYU
Member

Posts: 13120




Ignore
« Reply #1 on: September 23, 2009, 08:40:17 AM »

I'd just use a larger cable such as RG-213.  The losses
should be small enough not to worry about as long as the
SWR isn't excessive.

You can use VK1OD's transmission line loss calculator here:

http://www.vk1od.net/calc/tl/tllc.php

to compare the losses of various cable types and lengths.
100' of RG-213 has less than 1dB of loss, while the same
length of RG-8x has just over 1dB.  Either would work fine.
Logged
AA4PB
Member

Posts: 12770




Ignore
« Reply #2 on: September 23, 2009, 10:07:31 AM »

80-feet isn't much of a run for 20M. I've got about a total 150-foot run out to the tower and then up.
Logged
WB2WIK
Member

Posts: 20560




Ignore
« Reply #3 on: September 23, 2009, 10:49:42 AM »

My shortest coax run (out of eleven of them) is 165 feet.

No big deal.

I'd also use RG-213/U (not RG8X) for this.

If you have to string the cable between a detached garage and house, one easy way to do that is to install a strong hook into the structure on each end and run a messenger wire stretched taut between those two hooks (use a turnbuckle to tension it), then just hang the coax from that using tie-wraps or similar.

15 minute job.

WB2WIK/6
Logged
K9KJM
Member

Posts: 2416




Ignore
« Reply #4 on: September 23, 2009, 11:42:49 PM »

80 feet is not very far, Especially at HF frequencies for coax loss.

Belden RG 213 is considered the "Cadillac" of coax for HF use.

But you could use lots of other types, If you bury it, I would be sure to put it inside some type of conduit, Even just a plastic pipe, AND be sure to also lay in a bare copper wire outside the conduit for a ground wire to bond your systems grounds together.

If money is a problem, Check with your local cable TV people for "spool ends" of various types of coax and hardline that will work also, For about free.
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!