[Elecraft] PAR/LNR EFHW antenna

[VE3GAM]

the End Fed Half Wave Antennas group on Facebook,
started by N4LQ, Steve Ellington,
promotes the use of a 49:1 transformer

Steve does have a couple of videos on Youtube where
he shows you him making one of these transformers

check out how to build one,
image is on Elgin Amateur Radio Society's website
<https://elginradio.files.wordpress.com/2017/10/49-1-unun.jpg">

List of vendors of these if you do not want to build your own


  49:1 Transformer Vendors
  -------------------------------------

  myantennas
  http://myantennas.com/wp/

  hyendcompany
  https://www.hyendcompany.nl/

  balundesigns
  http://www.balundesigns.com/

  MFJ
  MFJ-1982LP/MP/HP, MFJ-1984LP/MP/HP
  http://www.mfjenterprises.com/

  packtenna (QRP only)
  http://packtenna.com/

  communicationworld
  https://www.communicationworld.nl/antennes_end_fed_zelfbouw


  2017.10.12 Al VE3GAM

al ve3gam



--------------------------------------------------
From: "K9MA" <k9ma at sdellington.us>
Sent: Monday, January 08, 2018 8:39 PM
To: <elecraft at mailman.qth.net>
Subject: Re: [Elecraft] PAR/LNR EFHW antenna

> On 1/8/2018 16:59, Rich Arland wrote:
>> Failing that path, has anyone hooked an EFHW to the internal ATU with 
>> good results? I would also include a cut to frequency ground radial that 
>> I would lay out below the antenna. That would be the easiest thing and 
>> simple to employ.
>
> That definitely will not work:  The impedance of the EFHW is much to high 
> for any internal ATU to match.  The 64:1 balun may work, though I haven't 
> tried one.  QRPKITS has a QRP tuner, but it works only on a single band. 
> Most any of the external antenna tuners will work, though they may be 
> lossy.
>
> The best solution, I think, is to build your own L-network tuner.  One 
> coil, a 3-position switch, and one variable capacitor.  You don't have to 
> get a perfect match, just within the range of the internal ATU, like 3:1. 
> Once you find the right coil tap positions, the internal ATU should be 
> able to handle the small mismatch with different antenna installations, 
> etc.
>
> It may seem like a lot of trouble, but if you can match the EFHW, it's 
> just about the most effective simple wire antenna you can use.
>
> 73,
>
> Scott K9MA
>
> -- 
> Scott  K9MA
>
> k9ma at sdellington.us
>
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