[TowerTalk] Fwd: Multiple HB9CV on a shared boom

[Hans Hammarquist via TowerTalk]

My way to "get rid" of the capacitor was to alter the length of the elements. By making them slightly longer you introduce a capacitance at the feeding point.


I never liked to have a capacitor in the open as they will be affected by weather-and-wind.


Hans - N2JFS



-----Original Message-----
From: Rudy Bakalov <r_bakalov at yahoo.com>
To: Hans Hammarquist <hanslg at aol.com>
Sent: Wed, Jun 3, 2015 8:02 am
Subject: Re: [TowerTalk] Multiple HB9CV on a shared boom


 
Hi Hans, 
 
  
 
 
Thanks for your email. It's good to know that others are experimenting with this type of antenna. I have very fond memories with this antenna from way back in the 80's in Bulgaria when we built tons of them and they consistently demonstrated killer performance. 
 
  
 
 
Strangely, we didn't use a capacitor in the feed system. Tell me a bit more- what kind do I need to run legal limit? I size all my stuff for 5KW as I am a RTTY contester and absolutely want to make sure components can take the heat. 
 
  
 
 
Rudy N2WQ  
  
  
   Sent using a tiny keyboard.  Please excuse brevity, typos, or inappropriate autocorrect.  
  
   
  
 
 
  
On Jun 2, 2015, at 11:49 AM, Hans Hammarquist <  hanslg at aol.com> wrote:  
  
 
 
  
   Hi Rudy,     
     
     
     
I have no experience with your suggested multiband HB9CV but I built several single band versions. I am very interested how this will work out for you as the HB9CV, to me, appears to be the best gain/material factor antenna. i never even thought of a multiband version.    
     
     
     
     
My first thought,reading your mail, is that you should not use regular coax cables for the phasing line as the dielectric will change the phase angle, something that might be detrimental to the gain and F/B ratio. It might not even be necessary to shield the different phase line from each other.    
     
     
     
     
Please keep me posted.    
     
     
     
     
Best 73 de    
     
     
     
     
Hans - N2JFS     
      
      
      
-----Original Message-----      
 From: Rudy Bakalov via TowerTalk <      towertalk at contesting.com>      
 To: Tower Talk <      towertalk at contesting.com>      
 Sent: Tue, Jun 2, 2015 9:06 am      
 Subject: [TowerTalk] Multiple HB9CV on a shared boom      
       
       
        
I was wondering if anyone has experience with building a 3 band HB9CV on a
shared boom. Basically, 3 separate antennas nested into each other- 20m, 15m,
and 10m.  My thought is to use coax for the phasing lines and a non-conductive
boom so that there is no feed/phase line interference.

The antenna will be
fixed and suspended by ropes so the non-conductive boom is not a structural
issue.

Thoughts?

Rudy N2WQ

Sent using a tiny keyboard.  Please excuse
brevity, typos, or inappropriate
autocorrect.

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