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[KAT500] more antennas

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ab2tc

[KAT500] more antennas

Hi all,

I apologize if this is a little bit OT, but it isn't really. My remote KAT500 is currently maxed out with a G5RV and two resonant dipoles for 10m and 15m (all working great). I am looking for an easy way to add my 80m resonant dipole to the mix and have decided that building a diplexer that would enable me to share one port for the 10m and 80m antennas should be an easy way to accomplish this. Design programs for these are easy to find and basically tell me that I need two inductors about 1.1-1.2uH. What toroid core should I choose for bulding an efficient inductor like this that would handle at least 500W on 3.8MHz and 28.5MHz?

AB2TC - Knut

Robert Friess

Re: [KAT500] more antennas

Either T130-6 or T130-2 should do nicely.

73,
Bob, N6CM

On Thu, Jan 17, 2013 at 2:22 PM, ab2tc <[hidden email]> wrote:

> Hi all,
>
> I apologize if this is a little bit OT, but it isn't really. My remote
> KAT500 is currently maxed out with a G5RV and two resonant dipoles for 10m
> and 15m (all working great). I am looking for an easy way to add my 80m
> resonant dipole to the mix and have decided that building a diplexer that
> would enable me to share one port for the 10m and 80m antennas should be an
> easy way to accomplish this. Design programs for these are easy to find and
> basically tell me that I need two inductors about 1.1-1.2uH. What toroid
> core should I choose for bulding an efficient inductor like this that would
> handle at least 500W on 3.8MHz and 28.5MHz?
>
> AB2TC - Knut
>
>
>
> --
> View this message in context:
> http://elecraft.365791.n2.nabble.com/KAT500-more-antennas-tp7568845.html
> Sent from the Elecraft mailing list archive at Nabble.com.
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Don Wilhelm-4

Re: [KAT500] more antennas

In reply to this post by ab2tc

Knut,

The easy way is to add two wires for 80 meters to either of the resonant
dipoles (using the same coax). If you orient the 80 meter antenna wires
at right angles to the existing antenna, there will be no interaction.
If you cannot get them at right angles, then separate the wires as much
as you can and re-tune the higher frequency antenna.

I run 3 such "fan dipoles" here. One for 80 and 40, another for 20, 15,
and 10, and yet another for 30, 17 and 12 meters. The 80 and 40 meter
antennas are inverted Vee while the others are straight dipoles. The 80
and 40 wires are at right angles while the wires for the others are
separated by about a foot - PVC is used for the spacers.

73,
Don W3FPR

On 1/17/2013 5:22 PM, ab2tc wrote:

Robert Sands

Re: [KAT500] more antennas

I use my Carolina Windom on port one (KAT 500 matches
80,60,40,20,17,15,10), 20 M beam on port two, and another set of antennas
on a remote switch on port 3. Whatever antenna I choose on that switch (80
M sloper, 40 M sloper or 20 M sloper) the KAT finds the right match for the
right band (if I switch to the right antenna). The system is great and the
tuner is flawless. So you can use the same antenna to match different bands
if it is matchable.
Bob
K7VO

On Fri, Jan 18, 2013 at 4:32 AM, Don Wilhelm <[hidden email]> wrote:

> Knut,
>
> The easy way is to add two wires for 80 meters to either of the resonant
> dipoles (using the same coax). If you orient the 80 meter antenna wires at
> right angles to the existing antenna, there will be no interaction. If you
> cannot get them at right angles, then separate the wires as much as you can
> and re-tune the higher frequency antenna.
>
> I run 3 such "fan dipoles" here. One for 80 and 40, another for 20, 15,
> and 10, and yet another for 30, 17 and 12 meters. The 80 and 40 meter
> antennas are inverted Vee while the others are straight dipoles. The 80
> and 40 wires are at right angles while the wires for the others are
> separated by about a foot - PVC is used for the spacers.
>
> 73,
> Don W3FPR
>
> On 1/17/2013 5:22 PM, ab2tc wrote:
>
>> Hi all,
>>
>> I apologize if this is a little bit OT, but it isn't really. My remote
>> KAT500 is currently maxed out with a G5RV and two resonant dipoles for 10m
>> and 15m (all working great). I am looking for an easy way to add my 80m
>> resonant dipole to the mix and have decided that building a diplexer that
>> would enable me to share one port for the 10m and 80m antennas should be
>> an
>> easy way to accomplish this. Design programs for these are easy to find
>> and
>> basically tell me that I need two inductors about 1.1-1.2uH. What toroid
>> core should I choose for bulding an efficient inductor like this that
>> would
>> handle at least 500W on 3.8MHz and 28.5MHz?
>>
>>
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>
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Robert Sands
K7VO
Olympia, WA

Edward R Cole

Re: [KAT500] more antennas

In reply to this post by ab2tc

I have a similar 80/40m inverted-V where my wires are separated by
1/2-inch painted wooden dowel about 8-inch long and spaced about
every two feet. The Balun is rated for a kw but I do not run more
than 300w. Center is held at 40-feet by my tower#2 and ends are at
22-feet held by a run of nylon cord to a 10m J-pole (24-foot tall)
and my 25-foot high 6m yagi support mast. Works excellently on upper
80m without tuner and uses a little tuning assistance to work all of 40m.

I originally tuned the 80m wires to 3920 and then adjusted 40m to
7240 using a MFJ269B analyzer. The 40m section is bit narrow band so
the tuner allows use down on 7093 for a local SSB Net (allowed in AK).

I can work anywhere in AK on 80m with this and outside to west coast
when bands open (note that Alaska stretches over 2.000 miles from the
tip of the Aleutians to the Canadian border). I can sit on 4125 and
receive the main marine USB channel regularly out to 1,000 miles. I
have run my K3/10 at 12w often on 80m with this antenna and gets out
very nicely...folks are surprised it is only 12w (KX3 works equally well).

73, Ed - KL7UW

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