Stackable Binding Post (BNC-BP)

[Joshua Gould, K8WXA]

Greetings,

I have yet another question...  I've decided that I'm going to get the KX3,
KXAT3, and the MH3 and am trying to now nail down the other options that I
will purchase, vs what I will add at a later date.

One of the things I'm looking at is the Stackable binding posts.  The way I
read this is that I can just use a random length wire (provided that it is
a 1/4 wavelength on some band), hook it to the radio and just get on the
air...

Is that an apt description of what this adaptor is for?

I would like to thank the group for answering my questions, and helping me
in my decision making.

Thanks and 73,
Joshua Gould
K8WXA
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[Matt Zilmer-3]

Hi Joshua,

That is exactly how I use it.  Works well with a quarter-wave wire and
a counterpoise.

73,
matt W6NIA

On Thu, 22 May 2014 19:52:32 -0400, you wrote:

>Greetings,
>
>I have yet another question...  I've decided that I'm going to get the KX3,
>KXAT3, and the MH3 and am trying to now nail down the other options that I
>will purchase, vs what I will add at a later date.
>
>One of the things I'm looking at is the Stackable binding posts.  The way I
>read this is that I can just use a random length wire (provided that it is
>a 1/4 wavelength on some band), hook it to the radio and just get on the
>air...
>
>Is that an apt description of what this adaptor is for?
>
>I would like to thank the group for answering my questions, and helping me
>in my decision making.
>
>Thanks and 73,
>Joshua Gould
>K8WXA
>______________________________________________________________
>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]

Matt Zilmer, W6NIA
--
"Give me six hours to chop down a tree and I will
spend the first four sharpening the axe." -A. Lincoln
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[Don Wilhelm-4]

Joshua,

You will want to use 2 - 1/4 wavelength wires - one for the radiator and
the other for a counterpoise.
It may "work" with just the radiator wire, but then the 'counterpoise'
will be the case of the transceiver and your body and anywhere else the
RF return path thinks it needs to be.  With the counterpoise wire in
place, that provides the RF return path and eliminates changes in tuning
(SWR variation) depending on where you position the transceiver and your
body.

73,
Don W3FPR

On 5/22/2014 7:52 PM, Joshua Gould wrote:

> Greetings,
>
> I have yet another question...  I've decided that I'm going to get the KX3,
> KXAT3, and the MH3 and am trying to now nail down the other options that I
> will purchase, vs what I will add at a later date.
>
> One of the things I'm looking at is the Stackable binding posts.  The way I
> read this is that I can just use a random length wire (provided that it is
> a 1/4 wavelength on some band), hook it to the radio and just get on the
> air...
>
> Is that an apt description of what this adaptor is for?
>
> I would like to thank the group for answering my questions, and helping me
> in my decision making.
>
>

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[Lynn W. Taylor, WB6UUT]

Joshua,

This is the beginning of a very long discussion, and one I'm still
studying after decades as a ham.

Ignoring the counterpoise for just a moment......

If your wire is 1/4 wave on some band, it will have a fairly low
impedance at the binding post connector and the KX3 tuner will tune it
just fine.

If your wire is some other length on the same band, there will be a
higher impedance at the feedpoint, and the KX3 will tune it just fine.

If your wire is 1/2 wave on that band, the impedance will be very high,
and the tuner likely won't tune it.

The reason you want to be aware of this is that a 1/4 wave on 20m will
be 1/2 wave on 10m.

I used to think that resonance was king, and the tuner made the antenna
resonant.  I'm starting to actually believe that isn't true.

Something that is truly "random" will work on some bands, not on
others.  There are charts that tell you how much wire to use so it is
not 1/2 wave on any useful ham band.

Alternately, you can just have a couple of different lengths of wire so
if you stumble on a half-wave length, you can switch to something ten or
fifteen feet longer or shorter.

73 -- Lynn

On 5/22/2014 4:52 PM, Joshua Gould wrote:

One of the things I'm looking at is the Stackable binding posts.  The way I
read this is that I can just use a random length wire (provided that it is
a 1/4 wavelength on some band), hook it to the radio and just get on the
air...


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