[TowerTalk] Broadbanding 80 meter dipole

[Kimberly Elmore]

Rod's idea is by far the best. Slopers are weird creatures. While you can broadband antennas by making the elements with a large diameter (as in a cage) the mechanical complexity isn't worth it. If they absolutely positively must be resonant, well...

Kim N5OP

      From: Rod Greene via TowerTalk <towertalk at contesting.com>
 To: Roger (K8RI) on TT <K8RI-on-TowerTalk at tm.net>; "towertalk at contesting.com" <towertalk at contesting.com> 
 Sent: Thursday, August 17, 2017 2:25 PM
 Subject: Re: [TowerTalk] Broadbanding 80 meter dipole
   
Or use an auto tuner at the feedpoint to match the slopers on whatever band/freq you want to use. That's what I do.
73, Rod/w7zrc


      From: Roger (K8RI) on TT <K8RI-on-TowerTalk at tm.net>
 To: "towertalk at contesting.com" <towertalk at contesting.com> 
 Sent: Thursday, August 17, 2017 12:33 PM
 Subject: [TowerTalk] Broadbanding 80 meter dipole
  
I've seen a few possibilities in the past, but I'd like to add a dew 
slopers to come up with the 5 used for some directivity, gain and front 
to back. Switched coils at the feedpoint with frequency sensing would 
likely work.  I've had excellent results with just a couple switched 
slopers on 40.

To complicate things I'd like to do this and maintain the dual band 75 / 
40 meter operation, which would likely require separate feedlines. The 
unused line would / could end up as a stub.  I could possibly use the 
frequency sensing to disconnect the coax for the unused band.

Thoughts?

-- 

73

Roger (K8RI)


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