Good length off the antenna

[Irma & Linas(LY2H)]

Hello,
8,8m could be a good length for your pole to tune from 40-6 m. It is
important to avoid the half wave lengths and its harmonics on the operating
frequency because it will produce a very high ( kiloohms) impedance which
normal tuner won't tune. Unless you go onpurpously for a 1/2 lambda
monoband antenna. It is very effective , needs a very short counterpoise
but you need to have special tuner, even the simpliest one made of a coil
and a variable cap. If you want multiband with a internal tuner, the
mentioned length is ok for all bands. There is many I more good lengths ,
you may google it on the net. I use  8,8m + 8,8m of couterpoise on the
ground  with my KX2 tuner for the outings and I have a 43m end fed wire for
a fixed 160-6 m operation at home with multiple quarter  wave radials on
the roof.
73 Linas LY2H

<<<To: Elecraft Reflector <[hidden email]>
Cc:
Bcc:
Date: Sun, 7 May 2017 10:24:14 +0300
Subject: [Elecraft] Good length for portable antenna
I'm taking my K2/10 to a school on Wednesday to do a demonstration. I
have a 10m fiberglass pole, and my plan is to hook a wire to it and
either lean it against something or bungee-cord tie it to a bike rack or
whatever is there. I will deploy a counterpoise wire on the ground.
Given that it is the middle of the day, I will probably try 20 or 17m,>>>
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[rich hurd WC3T]

This site has a pretty comprehensive guide to optimal random wire lengths.

http://udel.edu/~mm/ham/randomWire/

On Tue, May 9, 2017 at 8:11 AM, Irma & Linas(LY2H) <[hidden email]>
wrote:

> Hello,
> 8,8m could be a good length for your pole to tune from 40-6 m. It is
> important to avoid the half wave lengths and its harmonics on the operating
> frequency because it will produce a very high ( kiloohms) impedance which
> normal tuner won't tune. Unless you go onpurpously for a 1/2 lambda
> monoband antenna. It is very effective , needs a very short counterpoise
> but you need to have special tuner, even the simpliest one made of a coil
> and a variable cap. If you want multiband with a internal tuner, the
> mentioned length is ok for all bands. There is many I more good lengths ,
> you may google it on the net. I use  8,8m + 8,8m of couterpoise on the
> ground  with my KX2 tuner for the outings and I have a 43m end fed wire for
> a fixed 160-6 m operation at home with multiple quarter  wave radials on
> the roof.
> 73 Linas LY2H
>
> <<<To: Elecraft Reflector <[hidden email]>
> Cc:
> Bcc:
> Date: Sun, 7 May 2017 10:24:14 +0300
> Subject: [Elecraft] Good length for portable antenna
> I'm taking my K2/10 to a school on Wednesday to do a demonstration. I
> have a 10m fiberglass pole, and my plan is to hook a wire to it and
> either lean it against something or bungee-cord tie it to a bike rack or
> whatever is there. I will deploy a counterpoise wire on the ground.
> Given that it is the middle of the day, I will probably try 20 or 17m,>>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

--
73 (or 72 for the QRP folks),
Rich Hurd / WC3T
Northampton County RACES
EPA-ARRL Public Information Officer for Scouting
Latitude: 40.761621 Longitude: -75.288988  Grid: *FN20is*
40°45.68' N 75°17.33' W
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