[Elecraft] Load Impedance (was Re: Measuring SWR

[Bob McGraw K4TAX]

In many instances using a balun, not for balanced to unbalanced 
applications, but for impedance transformation application is 
suggested.   Use a 4:1 as a 1:4 in order to get the low Z to a higher 
value.  In most tuners, the low impedance range has more loss than the 
high impedance range.   I recall that Elecraft makes just this item.

73

Bob, K4TAX


On 4/11/2019 8:37 AM, Richard Corfield wrote:
> I'm experimenting with portable antennas at the moment for my KX3 and,
> rather than cut the 80m legs of my link dipole to get an antenna that
> resonates on 60m, I've experimented with running it off centre. I've found
> what looks like resonance at the right frequency range, based on low return
> loss.
>
> http://m0rjc.me.uk/screenshot_20190411-132334/
>
> The problem is, that impedance is low. I guess it's being transformed down
> by the 10m of feed line, as normal wisdom for an off-centre feed is high
> impedance due to the lower currents and higher voltages towards the ends of
> a half wave antenna. Considering a velocity factor of 0.66 that feed line
> is about 1/4 wavelength long!
>
> Presumably the KXAT-3 will tune this, but do I lose efficiency by having
> what would be higher currents in its circuitry?
>
>   - Richard
>
> On Wed, 10 Apr 2019 at 22:56, Fred Jensen <k6dgw at foothill.net> wrote:
>
>> It was a feeble attempt at humor, given the nearly countable infinity of
>> posts here on baluns over the last few years including but not limited
>> to what they are, what they aren't, how they work, do they even work?,
>> and do they even exist at all.  Perhaps my attempt was more feeble than
>> I thought. [:-) And, yes I know that "near infinity" is meaningless.
>>
>> 73,
>> Fred ["Skip"] K6DGW
>> Sparks NV DM09dn
>> Washoe County
>>
>> On 4/10/2019 11:13 AM, Bob McGraw K4TAX wrote:
>>> Hummmm.......see: http://www.dj0ip.de/balun-stuff/
>>>
>>> I seem to think this fellow has a good grasp about the "alien origin"
>>> of baluns.
>>>
>>> 73
>>> Bob, K4TAX
>>>
>>>
>>> On 4/10/2019 12:23 PM, Fred Jensen wrote:
>>>> It also spawned the "balun," a mysterious device that may be of alien
>>>> origin since no one seems to know exactly what it does or how it does
>>>> it.
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