KX1 # 2047 comes alive!

[Sante - IK0HBN]

Hi everybody,
I just finished to assemble my KX1 with autotuner and 30/80 option
and I have one question for you:
"As the the manual has been written for 20-30 and 40 meters bands,
the lenghts for a long wire are given for those bands. How long
should it be for having a good compromise even on 80 mtrs? I'd like
to have just one wire for backpacking"

Thanks in advance
Sante, IK0HBN

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[James C. Hall, MD-2]

Hi Sante:

Congratulations on your new KX1 ! If you are talking about a 'random length'
long wire antenna, I'm betting you could get away with 66 feet if you lay a
66 foot counterpoise on the ground. The other idea I have is a 135 foot
center-fed doublet fed with window line - the small stuff for backpacking
would be 300 ohms. You could use the BNC to mini-binding posts connector by
Pomona and you should be off to the races !

Have fun !

73, Jamie
WB4YDL

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Sante - IK0HBN
Sent: Tuesday, August 05, 2008 3:44 PM
To: [hidden email]
Subject: [Elecraft] KX1 # 2047 comes alive!

Hi everybody,
I just finished to assemble my KX1 with autotuner and 30/80 option
and I have one question for you:
"As the the manual has been written for 20-30 and 40 meters bands,
the lenghts for a long wire are given for those bands. How long
should it be for having a good compromise even on 80 mtrs? I'd like
to have just one wire for backpacking"

Thanks in advance
Sante, IK0HBN

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[Andrey Stoev]

Hey guys,
I posted on my blog ( http://blog.kotarak.net/ ) some text and pictures of
KPA100/KAT100 in EC2 modification I did a few years ago.
I installed a couple of LCD meters on the front panel of the EC2. This is a
fun project and easy to do! Its been working just fine all those years.

73
de Andrey, AE1Z


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[Don Wilhelm-4]

Sante,

Although you may be able to load a small antenna on 80 meters, the
efficiency will diminish as the antenna gets physically smaller (one
cannot defeat the laws of physics).
I would suggest that you carry along extensions.that you can clip on to
extend the physical length of your radiator to something in the vicinity
of 135 feet total (radiator plus "counterpoise").

Whether the extensions are deployed at height or simply strung out near
the ground will not make much difference - keep the antenna center high
because that is where the major portion of the radiation takes place.

Picture a half wave dipole with the center of that half wave at the
highest point you can manage.  That dipole can be fed at the end, the
center, or any point in between with the feedpoint impedance varying
from about 50 to 75 ohms (for center fed) to 4000 ohms (for end fed) -
you must choose the 'best' arrangement for you depending on what you
anticipate your portable physical constraints might be (horizontal
space, vertical space, etc.).  Consider a vertical radiator as half a
dipole - you need radials to complete the dipole - if the radials are
physically opposing, the horizontal radiation will cancel and all the
radiation will be only vertically polarized - a single radial will
result in both vertical and horizontal radiation - either will work, but
the distance covered will vary depending on propagation conditions
existing at the time.

73,
Don W3FPR


Sante - IK0HBN wrote:

> Hi everybody,
> I just finished to assemble my KX1 with autotuner and 30/80 option and
> I have one question for you:
> "As the the manual has been written for 20-30 and 40 meters bands, the
> lenghts for a long wire are given for those bands. How long should it
> be for having a good compromise even on 80 mtrs? I'd like to have just
> one wire for backpacking"
>
> Thanks in advance
> Sante, IK0HBN
>

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[Sante - IK0HBN]

Thanks to all who replied to my post. This evening I'll try to erect
something longer. Please stay tuned, as yesterday evening K9EU (dig
me out on 20 giving a true 559! Not bad for a box with 3.4 watt!!
I'll try to have 2 antenna, one long 66 ft for 80 and another of 44
ft with 33 ft of counterpoise.
CUL es thanks agn.
Sante, IK0HBN

At 03.21 06/08/2008, you wrote:

>Sante,
>
>Although you may be able to load a small antenna on 80 meters, the
>efficiency will diminish as the antenna gets physically smaller (one
>cannot defeat the laws of physics).
>I would suggest that you carry along extensions.that you can clip on
>to extend the physical length of your radiator to something in the
>vicinity of 135 feet total (radiator plus "counterpoise").
>
>Whether the extensions are deployed at height or simply strung out
>near the ground will not make much difference - keep the antenna
>center high because that is where the major portion of the radiation
>takes place.
>
>Picture a half wave dipole with the center of that half wave at the
>highest point you can manage.  That dipole can be fed at the end,
>the center, or any point in between with the feedpoint impedance
>varying from about 50 to 75 ohms (for center fed) to 4000 ohms (for
>end fed) - you must choose the 'best' arrangement for you depending
>on what you anticipate your portable physical constraints might be
>(horizontal space, vertical space, etc.).  Consider a vertical
>radiator as half a dipole - you need radials to complete the dipole
>- if the radials are physically opposing, the horizontal radiation
>will cancel and all the radiation will be only vertically polarized
>- a single radial will result in both vertical and horizontal
>radiation - either will work, but the distance covered will vary
>depending on propagation conditions existing at the time.
>
>73,
>Don W3FPR
>
>
>Sante - IK0HBN wrote:
>>Hi everybody,
>>I just finished to assemble my KX1 with autotuner and 30/80 option
>>and I have one question for you:
>>"As the the manual has been written for 20-30 and 40 meters bands,
>>the lenghts for a long wire are given for those bands. How long
>>should it be for having a good compromise even on 80 mtrs? I'd like
>>to have just one wire for backpacking"
>>
>>Thanks in advance
>>Sante, IK0HBN

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