antentopSince2 July

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

 

 

 

 

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

Special page devoted to

44 Feet Dipole. Where is the Truth?

Custom Search

 

ANTENTOP- 01- 2014 # 018

44 Feet Dipole. Where is the Truth?

 

Note I.G.: Below you can see SWR (at 350- Ohm Terminal)for 88- Feet Dipole Antenna placed at 10 and 20- meters above real (simulated by MMANA) ground. As you can see the 88- feet antenna really has at the amateur bands SWR/Impedance that could be matched with simple ATU.

 

As you can see, the 88- Feet Dipole Antenna is much better matched with 350- Ohm feed line in compare to 44-Feet Dipole Antenna. It is only proved the old amateurís wisdom on antenna- the bigger the better.

On my look the 88-Feet Antenna is more preferable, but room for this one!

 

SWR (at 360-Ohm Terminal) of a 88-Feet Antenna Placed at 10- meters above Real Ground

 

 

SWR (at 360-Ohm Terminal) of a 88-Feet Antenna Placed at 10- meters above Real Ground

Now , using the standard accepted formula for calculatingthe ¨approximate¨ length of a wire dipole for the HF frequencyrange from about 5 to 25 megaHertz....143 / frequency in megahertzlet us play with a little math amigo !!!

 

143/ 7.15  for the half wave resonance on the 40 metersband will yield exactly 20 meters , so 10 meters on each sideor moving to Imperial British Measures 65.6 feet overallor 32.8 feet on each leg. (Figure 3 shows the 66- Feet Dipole Antenna.)

 

 

 

Figure 3

66-Feet Dipole Antenna

 

 

 

www.antentop.org

Page- 22

 

20 21 22 23 24

 


 

 

Just for Fun:

Map IP Address
Powered byIP2Location.com

Thanks for your time!

Last Updated:

May 1, 2016 22:26

** PLEASE DESCRIBE THIS IMAGE **

** PLEASE DESCRIBE THIS IMAGE **

2003entop