ARTS Newsflash

REPEATER & LINK STATUS:
W4CN 147.180 Repeater: UP        WIRES-X Room (CQ-Louisville 21014): UP
WIRES-X Link/Node for 147.180: UP    
CQ-Lou YSF Reflector (42274): UP
EchoLink: Analog FM (W4CN-R 425970): UP
EchoLink: Digital C4FM CQ-Lou Room (KE4JVM-R 634824): UP
 

  1. If you are viewing on your phone:  This site is best viewed holding your phone in landscape mode. (Rotate phone for wider screen.)
  2. Next Club Meeting - Thursday, June 13th, 7:30 p.m. at Jeffersontown Fire Station 2, located at 4318 Taylorsville Rd. 40220.
  3. June Events:  Lewis and Clark Trail on the Air!  AND  Summer Field Day Weekend!
  4. Local HAM License Testing, click HERE.
  5. Weekly ARTS On The Air - Nets:  Click HERE for information on our club sponsored on the air nets.
  6. HAM Equipment FOR SALE: Click HERE.
  7. 2024 Membership Dues for current members:  To pay, log into this site and select Pay Dues on the User Menu.
If you are interested in becoming a member, read the article below with heading: Amateur Radio Transmitting Society (ARTS).

ARTS Slide's

Setting Up Tower with Yagi Antenna
ARTS Club Summer Field Day
Antenna Build and Fox Hunt
Antenna Build and Fox Hunt
Island Expedition Station
ARTS Club Embry Island Expedition, QSO Party - US Islands Awards Program (1st Place 2016 & 2nd Place 2020)
Antenna Build and Fox Hunt
Antenna Build and Fox Hunt
Antenna Build and Fox Hunt
Antenna Build and Fox Hunt

OK, so you don't have enough wire to lay down 120 - 1/4 wave length radials for your ground mounted vertical antenna.  They saying is more short radials is better than a few  longs ones.  But what is the ideal number of radials for the amount of wire you have? 

For the long answer, see the Aug 2003 issue of QST, page 39.

The Cliff Notes version is this formula:

N = 2.25(sf)^.25 L^.5

Where N is the number of radials for a given length of wire which will provide the minimum ground loss.

s = soil conductivity.  I used s=0.0045 for average soil in my computations.

f = frequency.  Use the frequency of the lowest band you will use on your vertical antenna.

L = the length of wire you have to use for radials.

If you have 1000 feet of wire, the optimum number radials for the following bands would be:

160 meters - 22 radials, 80m - 26 radials, 40m - 30 radials, 20m - 36 radials, 15m - 40 radials.

For 500 feet of wire:  80m - N=18, 40m - 21, 20m - 25, 15m - 28, 10m - 30 radials.

For the low bands more would be better.  3000 feet would be 38 radials for 160m and 45 for 80m.

73

Dave
W4DFR

 

 

 

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