antentopSince2 July

** PLEASE DESCRIBE THIS IMAGE **
** PLEASE DESCRIBE THIS IMAGE **
** PLEASE DESCRIBE THIS IMAGE **

 

 

 

 

Antentop is FREE e-magazine devoted to Antennas and Amateur Radio an

Special page devoted to

EH Antenna for the 20- meter Band

Custom Search

 

ANTENTOP- 01- 2012, # 016

EH Antenna for the 20- meter Band

 

 

 

 

Be advised, that minimum SWR and maximum of the radiation power do not match in the EH- Antenna. If you would like to tune the antenna on to maximum radiation power use to FSM (Field Strength Meter) at the tuning. FSM should be placed far away from the antenna. However, 2- 3- meter is enough for that.

 

When tune the antenna by minimum SWR check the FSM. Find the compromising tuning when good SWR match to the maxima reading of the FSM.

Off course it is possible to use a MFJ- 259 (or something similar) for tuning the EH- Antenna.

If the EH-Antenna will be installed outdoor you should provide protection of the antenna against atmospheric impact. The simple solution is to place the antenna inside of a plastic tube diameter of 50- mm. EH-Antenna should be installed along center line of the tube. Resonance frequency of the antenna may be changed. To tune the antenna in the resonance install at the upper end of the protection tube a closed turn. The turn may be made of a strip of the copper foil (the same as used at the cylinders) in width 8- 10 mm. By changing location of the closed turn it is possible to tune the EH- Antenna.  


Attention! Tuning of the EH- Antenna must be done at cold Antenna. You must remove RF power from the antenna! Dangerous high voltage may be present on the part of the antenna.

Practice of the EH- Antenna

For some reason I cannot install the antenna outside. So I hang up the antenna at the first floor of my apartment turn on transceiver and go ahead! EH- Antenna was placed only near 2.5- 3- meter above the ground. Figure 18 shows EH- Antenna inside of my apartment. Figure 19 shows view from the window of my apartment. Table 1 shows some QSOs made with the antenna. I called the stations. I do not work on CQ. Almost all of stations replied to me from my first calling. My transceiver had output RF power 50- Wtts.

 

 

 

Figure 17 SWR Vs Tap at EH- Antenna

Figure 18 EH- Antenna inside of my Apartment

 

 

 

 

 

www.antentop.org

  

Page-53

 

46 47 48 49 50 51 52 53 54

 

 


 

 

Just for Fun:

Map IP Address
Powered byIP2Location.com

Thanks for your time!

Last Updated:

May 3, 2016 23:06

** PLEASE DESCRIBE THIS IMAGE **

** PLEASE DESCRIBE THIS IMAGE **

2003entop