[Elecraft] Bal[un] (was: Buddipole vs. tuner and wire)

David Ferrington, M0XDF M0XDF at Alphadene.co.uk
Tue May 13 12:29:46 EDT 2008


Last year I used an inverted V doublet, supported by a telescopic  
carbon fibre pole (DK9SQ pole <http://www.qsl.net/dk9sq> and review at http://www.eham.net/reviews/detail/1094) 
  and fed by a short length of ribbon (300 ohms I think, the clear  
plastic type) via an SG237. The doublet was not cut for any particular  
band and I did not use a balun or redials etc. I worked PY from  
Southern France (~5000 miles) on 20m with 100W SSB from an FT-857.

I haven't tried it yet, but I plan on doing the same again with my K3,  
but via a BL2 this time.
73 de M0XDF, K3 #174
-- 
The universe is like a safe to which there is a combination. But the
combination is locked up in the safe.
-Peter De Vries, editor, novelist (1910-1993)

On 13 May 2008, at 16:37, Brian Lloyd wrote:

> OK, I am convinced - keep the tuner and the wire. So, that brings up  
> a second question: balanced vs. unbalanced.
>
> Wire antennas that do not require a counterpoise are usually loops  
> or dipoles, i.e. inherently balanced even if not resonant. Most  
> tuners offer an unbalanced output. SGC says, just connect up the  
> antenna. Seems to me that a balun would improve things and keep RF  
> off the coax and power leads to the tuner. But how well do baluns  
> handle huge mismatch?
>
> Just off the top of my head, it seems to me that the tuner at the  
> top of a pole with two legs sloped down, i.e. inverted-V, would make  
> a pretty good omni all-band antenna.
>
> More thinking aloud.
>
> Brian Lloyd
> Granite Bay Montessori School          9330 Sierra College Bl
> brian AT gbmontessori DOT com          Roseville, CA 95661
> +1.916.367.2131 (voice)                +1.791.912.8170 (fax)
>
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