[Elecraft] Portable Antennas (Is there an "easy" button?)

[Mike WA8BXN]

The video and website referenced should have some things pointed out. The
video SWR values called out are those obtained through the tuner in the K-2.
At times I have had the unused antenna accidentally selected and ran the
tuner and got reasonably low swr matches. It found a match but a lot of
power would have been dissipated in the tuner. 
 
The website for the 9:1 balun nicely does not claim the antenna described
using 30 feet of wire as an end fed half wave but rather and end fed antenna
 On 40 meters that length is near a quarter wave and would need a ground
system for good performance. On 20 meters it is near a half wave but not
quite. That may be good, making it easier to match. Note a tuner is required

 
Using an antenna like this can make contacts. On most frequencies the swr in
the coax from the balun to tuner will be high and thus loss could be high
for long runs of lossy coax. For portable operation with a few feet of coax
that should not be much of an issue. 
 
There is nothing magic about the configuration. It should work better than
the greatly shortened wonder antennas. A say 25 foot wire connected to the
output of a tuner would probably do as well eliminating the use of the balun
 A ground system as simple as a single radial will improve results in most
cases. 
 
73 - Mike WA8BXN 
 
 
 
 
-------Original Message------- 
 
From: Burke Jones 
Date: 5/8/2012 2:22:45 PM 
To: N1EU 
Cc: elecraft at mailman.qth.net 
Subject: Re: [Elecraft] Portable Antennas (Is there an "easy" button?) 
 
Forgot the link - sorry about that! 
 
http://www.earchi.org/92011endfedfiles/Endfed6_40.pdf 
 
On Tue, May 8, 2012 at 1:11 PM, Burke Jones <burkejones at gmail.com> wrote: 
 
> Here is a good link for the EFHW which details the matching box that is 
> discussed in the video. I just ordered some supplies today to build one 
> (or two) of these. 
> 
> Burke Jones 
> N0HYD 
> KX1 
> 
> 
> On Tue, May 8, 2012 at 12:06 PM, N1EU <n1eu.barry at gmail.com> wrote: 
> 
>> I agree that the EFHW is a good performer and it's a main player in my 
>> portable arsenal. However, I give little to no credence in the 
>> "comparison" 
>> featured in that linked video. There's no evidence that they're remotely 
>> aware of the azimuthal pattern of the 135ft OCF on 15M. Hint, it's NOT 
>> broadside. 
>> 
>> 73, 
>> Barry N1EU 
>> 
>> 
>> 
>> Stan levandowski wrote 
>> > 
>> > Tom, it's by no means a perfect antenna but it *does* perform quite
well 
>> > for me. 
>> > 
>> > 
>> >> After watching Stan Video last night I placed an order for a few 
>> >> T-106-2's to build the transformer...looks pretty straightforward and 
>> >> inexpensive. Tnx Stan 
>> > 
>> >> 
>> >> On 5/7/2012 1:43 PM, Jim Lowman wrote: 
>> >>> Enjoyed the video, Stan. I may look into one of these. 
>> >>> 
>> > 
>> >>>> 
>> >>>> See my "not perfect, but pretty darn good solution at" : 
>> >>>> http://www.youtube.com/watch?v=uWkpQ785Pjo 
>> >>>> 
>> >>>> 
>> >>>> 73, Stan WB2LQF 
>> > 
>> > 
>> 
>> 
>> -- 
>> View this message in context: 
>> http://elecraft.365791.n2.nabble
com/Portable-Antennas-Is-there-an-easy-button-tp7533480p7539897.html 
>> Sent from the Elecraft mailing list archive at Nabble.com. 
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