[Elecraft] Balun suggestions

[Eric Swartz - WA6HHQ, Elecraft]

Guys - please take this off reflector until you are in agreement.

73

Eric
List Moderator
/elecraft.com/

On 2/5/2016 8:15 PM, Ron D'Eau Claire wrote:
> Gee, Wes. It's only basic RF engineering.
>
> If you'd care to be specific about any objection, please do so. I'll be glad
> to get into details on or off the reflector.
>
> 73, Ron AC7AC
>
> -----Original Message-----
> From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Wes
> (N7WS)
> Sent: Thursday, February 4, 2016 4:18 PM
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] Balun suggestions
>
> I just pinched myself; I'm not dreaming and it's not April 1st, so I guess
> you're serious.
>
> You are also so wrong on so many points, I'm not going to waste time trying
> to refute or correct them.
>
> Jim, please ignore everything said below.
>
> Wes  N7WS
>
>
>
> On 2/4/2016 3:05 PM, Ron D'Eau Claire wrote:
>> Your feed line will do the job by itself so no additional "balun" is
> needed.
>> Keep in mind that a 1:1 balun is really just a length of feed line,
>> usually wound on a toroidal core to make the required length shorter
>> than if it was in open air. The "old-school" baluns were just a pair of
> air wound coils.
>> If your balanced feed line is at least 1/4 wavelength long, the
>> currents will be "balanced" (equal and out of phase) at the antenna.
>> That assumes your antenna is perfectly balanced to provide a perfectly
>> balanced load, which "balanced" antennas almost never do. There are
>> just too many variables. So expect excellent results even with shorter
>> feed lines. The amount of radiation (or pickup) from the feed line
>> even at the rig end is small in any case.
>>
>> Connect one side of the open wire feed line to the KAT100 SO-239
>> center pin and the other to the KAT100 ground terminal.
>>
>> 73, Ron AC7AC
>>
>>
>>
>> -----Original Message-----
>> K2/100 and KAT100 here.
>>
>> I am changing around my modest antenna configuration now.  I have been
>> using the K2/100 with my AH-4, and now wish to use the KAT100 with
>> balanced feedline antennas.
>>
>> What balun, homebrew or commercial, if any, should I use?  I almost
>> always run 5 watts, all CW.
>>
>> 73 de W6OGC Jim Allen
>>
>>
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>> wes at triconet.org
>>
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