Antennas for KX-1

[J. Coote]

I've been following the 4-band antennas for KX-1 thread.  Interesting and a
real challenge for field operations.  K2HYD's idea of a 51 foot antenna and
counterpoise was helpful.

Some additional thoughts-  the ATU in the KX-1 is a little limited, as
compared to other larger ATUs with more combinations, so we need antenna
lengths which are relatively close to 50 ohms and nonreactive.

The G5RV has already been done, but I am thinking of getting out my MFJ
bridge thingie and trying flattop/feeder, or antenna/counterpoise length
combinations (other than the G5RV) that will work well, and repeatably with
the KX-1 internal ATU.

Seems to me there have to be many flattop/feeder or antenna/counterpoise
length combinations.

73
Jay
W6CJ

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[Ron D'Eau Claire-2]

In an earlier post, I mentioned using a small inductor - such as some
enameled wire wound on a plastic 35-mm film can - with a number of tap
points to add inductance to the antenna. It goes in series with the "hot"
side of the KX1 output. That will usually let you adjust the electrical
length of the antenna to bring it within range of the ATU without having to
go out and fiddle with the length of the radiator itself.

The KX1 ATU is more limited than the other Elecraft ATUs but it still has a
very useful range. It's not necessary to be close to 50 ohms non-reactive
for the KXAT1 to provide a good match.

Ron AC7AC

-----Original Message-----
I've been following the 4-band antennas for KX-1 thread.  Interesting and a
real challenge for field operations.  K2HYD's idea of a 51 foot antenna and
counterpoise was helpful.

Some additional thoughts-  the ATU in the KX-1 is a little limited, as
compared to other larger ATUs with more combinations, so we need antenna
lengths which are relatively close to 50 ohms and nonreactive.

The G5RV has already been done, but I am thinking of getting out my MFJ
bridge thingie and trying flattop/feeder, or antenna/counterpoise length
combinations (other than the G5RV) that will work well, and repeatably with
the KX-1 internal ATU.

Seems to me there have to be many flattop/feeder or antenna/counterpoise
length combinations.

73
Jay
W6CJ

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[Alexandra Carter]

(1) Wire up in a tree,
(2) Pac-12.

Between those two, you're taken care of with the KX1. 73 de Alex NS6Y.

On Jun 29, 2006, at 6:20 PM, J. Coote wrote:

> I've been following the 4-band antennas for KX-1 thread.  
> Interesting and a
> real challenge for field operations.  K2HYD's idea of a 51 foot  
> antenna and
> counterpoise was helpful.
>
> Some additional thoughts-  the ATU in the KX-1 is a little limited, as
> compared to other larger ATUs with more combinations, so we need  
> antenna
> lengths which are relatively close to 50 ohms and nonreactive.
>
> The G5RV has already been done, but I am thinking of getting out my  
> MFJ
> bridge thingie and trying flattop/feeder, or antenna/counterpoise  
> length
> combinations (other than the G5RV) that will work well, and  
> repeatably with
> the KX-1 internal ATU.
>
> Seems to me there have to be many flattop/feeder or antenna/
> counterpoise
> length combinations.
>
> 73
> Jay
> W6CJ
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com

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[Paul - VE1DY-2]

I was out of town on a business trip this week, which gave me a good
opportunity to try the antenna suggested by Bruce.  I used his 68'
with the 33' counterpoise.  The kx1 obtained a flat match on 20, 30
and 80, but 40 was 1.9.

I then tried Ron's suggestion.  I had a 13' piece of wire so I wrapped
it around my glasses case, which was approx 1.5" x 2.5", and this gave
me a flat match on 40, but drove the swr up on the other 3 bands.
It's not much trouble to clip/unclip the glassed case coil, so I was
quite pleased.  I will now make a small coil and keep it with the
antenna.

This set up worked very well for me.  Thanks Bruce and Ron.

Paul



On 6/29/06, J. Coote <[hidden email]> wrote:

> I've been following the 4-band antennas for KX-1 thread.  Interesting and a
> real challenge for field operations.  K2HYD's idea of a 51 foot antenna and
> counterpoise was helpful.
>
> Some additional thoughts-  the ATU in the KX-1 is a little limited, as
> compared to other larger ATUs with more combinations, so we need antenna
> lengths which are relatively close to 50 ohms and nonreactive.
>
> The G5RV has already been done, but I am thinking of getting out my MFJ
> bridge thingie and trying flattop/feeder, or antenna/counterpoise length
> combinations (other than the G5RV) that will work well, and repeatably with
> the KX-1 internal ATU.
>
> Seems to me there have to be many flattop/feeder or antenna/counterpoise
> length combinations.
>
> 73
> Jay
> W6CJ
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>

--
QRP-L #2507,  SKCC #91
www3.ns.sympatico.ca/ppike
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