Ham Operator Forums

Please login or register.

Login with username, password and session length
Advanced search  


SMF - Just Installed!

Author Topic: SWR bandwidth data for 40 and 80 meter Inverted V  (Read 3757 times)


  • Administrator
  • Jr. Member
  • *****
  • Posts: 68
    • View Profile
SWR bandwidth data for 40 and 80 meter Inverted V
« on: August 12, 2013, 11:26:02 AM »

My latest antenna project is a DX engineering 10K+ 1 to 1 Current balun with wires for 40 and 80 meters. I am very pleased with the performance of the antenna so far. I would like to increase the bandwidth of 80.  I might try larger size wire to see if that helps.  I am currently using 14AWG wire.

The data was captured from the AIM4170C.  I wasted a week of testing and tuning the 80 meter antenna because the MFJ259B was reporting a 1.9 to 1 SWR for this antenna.  After noticing that the radio was showing 1.2 to 1, I asked my friend to bring his AIM over. 

The first file is the data for the 40 meter band.

The second two files are the same antenna on 80 meters.  One file is for 100Ft of feedline. The other plot is with another 100Ft of feedline added in for a total of 200Ft.

The setup:

55ft crank up tower up about 45 ft.
DX ENG 10K+ 1 to 1 current balun mounted on horizontal fiberglass arm
Two wires for 40 and two for 80 spead out 45 degrees forming a bow tie.

« Last Edit: August 12, 2013, 11:32:35 AM by KE7TRP »