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" <[email protected]>
Sent: Monday, January 08, 2018 8:39 PM
To: <[email protected]>
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
[email protected]
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
![https://elginradio.files.wordpress.com/2017/10/49-1-unun.jpg"](https://elginradio.files.wordpress.com/2017/10/49-1-unun.jpg"){kind=link}