[OT] Antenna Question

That is a huge mismatch. Assuming that the portable 20m vertical is easily
assessable I would just clip on an inductor at the base to make it resonant
on 40m.  If you have elevated radials you would have to put one there also
or just lay the radials on the ground.  

John KK9A

[Elecraft] [OT] Antenna Question

rick jones n3ikq
Sat Aug 6 22:58:39 EDT 2016

Ok sorry for not providing enough info! Consider this scenario: I have a
portable vertical with 4 counterpoise wires that is resonant on 20. Lets say
I want to tune the antenna up on 40. I can have a tuner right at the base of
the antenna OR I can just use a balun at the base of the antenna and use the
built in ATU in the K3. Is there a difference in how much power is getting
to the antenna? I assume the tuner at the base is the best option which
always makes me doubt the usefulness of having an ATU built in to a rig in
terms of getting the most power to the antenna. Am I on the right track?
Thanks! Rick

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[Don Wilhelm]

Clipping a 17 foot wire to the top may be easier than adding an inductor.
Add at least one 33 foot counterpoise wire - or extend one of the 20
meter counterpoise wires with another clip-on 17 foot wire.

73,
Don W3FPR

On 8/7/2016 11:32 AM, [hidden email] wrote:

> That is a huge mismatch. Assuming that the portable 20m vertical is easily
> assessable I would just clip on an inductor at the base to make it resonant
> on 40m.  If you have elevated radials you would have to put one there also
> or just lay the radials on the ground.
>
> John KK9A
>
> [Elecraft] [OT] Antenna Question
>
> rick jones n3ikq
> Sat Aug 6 22:58:39 EDT 2016
>
> Ok sorry for not providing enough info! Consider this scenario: I have a
> portable vertical with 4 counterpoise wires that is resonant on 20. Lets say
> I want to tune the antenna up on 40. I can have a tuner right at the base of
> the antenna OR I can just use a balun at the base of the antenna and use the
> built in ATU in the K3. Is there a difference in how much power is getting
> to the antenna? I assume the tuner at the base is the best option which
> always makes me doubt the usefulness of having an ATU built in to a rig in
> terms of getting the most power to the antenna. Am I on the right track?
> Thanks! Rick
>

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[NJ8M]

How stiff is the 20 meter vertical? I take an 8 inch long piece of 1.5in
pvc and make a stand off at the base and the top for the vertical. Then run
a wire from the 20 meter feed point to the top of the 20 meter vertical
giving you 17feet...then out another 17 feet and you will have an inverted
L. Otherwise you can put a 20 meter trap at the top and put a 17 feet piece
of wire out with no stand offs and do the same thing. Although, if you use
the parallel feed, you can use the 40 meter wire (inverted L) on 15 meters
easily with no tuner. Just put down a few wires on the ground and let the
grass grow over them

You may need to add a counter traction on the vertical with an insulated
rope to keep the vertical from bowing in the direction of the 40 meter L.
It should work really nicely for you.  I know that this works because I use
a 40 meter vertical that I have rigged to work 160 through 10.

Vy 73,

Morgan NJ8M


On Sun, Aug 7, 2016 at 10:42 AM, Don Wilhelm <[hidden email]> wrote:

> Clipping a 17 foot wire to the top may be easier than adding an inductor.
> Add at least one 33 foot counterpoise wire - or extend one of the 20 meter
> counterpoise wires with another clip-on 17 foot wire.
>
> 73,
> Don W3FPR
>
>
> On 8/7/2016 11:32 AM, [hidden email] wrote:
>
>> That is a huge mismatch. Assuming that the portable 20m vertical is easily
>> assessable I would just clip on an inductor at the base to make it
>> resonant
>> on 40m.  If you have elevated radials you would have to put one there also
>> or just lay the radials on the ground.
>>
>> John KK9A
>>
>> [Elecraft] [OT] Antenna Question
>>
>> rick jones n3ikq
>> Sat Aug 6 22:58:39 EDT 2016
>>
>> Ok sorry for not providing enough info! Consider this scenario: I have a
>> portable vertical with 4 counterpoise wires that is resonant on 20. Lets
>> say
>> I want to tune the antenna up on 40. I can have a tuner right at the base
>> of
>> the antenna OR I can just use a balun at the base of the antenna and use
>> the
>> built in ATU in the K3. Is there a difference in how much power is getting
>> to the antenna? I assume the tuner at the base is the best option which
>> always makes me doubt the usefulness of having an ATU built in to a rig in
>> terms of getting the most power to the antenna. Am I on the right track?
>> Thanks! Rick
>>
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> 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]
>

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