Elecraft

Re: EFHWD

Classic

List

Threaded

3 messages Options

ve3bwp

Re: EFHWD

Hi John,

This is great! Thank you for taking the time to write this.

Having only experimented with centre fed dipoles as base antennas over the years these end feds open up a whole new set of placement possibilities for me. I have to confess prior to this I thought of (random wire) end feds as non resonant compromise antennas. Yet another shattered paradigm for me.

Come spring I will in fact be trying these out in place of my current dipole. I'll source and order the torriod cores now and I will surely keep you posted. Also I think a 160m end fed will be a worthy project this summer.

So height above ground of the end feds will have the same effect on take off angle as it does with dipoles?

My What3words locator is unclip.weirder.shields if you want to check out my property layout on google earth.

Thanks and regards,

Brian ve3bwp

On Feb 12, 2017, at 10:20 AM, J.H. de Wit <[hidden email]> wrote:

pa0wit
______________________________________________________________
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]

Don Wilhelm

Re: EFHWD

Brian,

I repeat what I have posted several times:
A resonant dipole radiates the same no matter where it is fed - center,
end or anywhere in between makes no difference in the radiation pattern.

In other words, a dipole is a dipole, is a dipole.
The dipole refers to the current/voltage distribution, and not to how it
is fed.

73,
Don W3FPR

On 2/12/2017 11:03 AM, Brian Pietrzyk wrote:

> Hi John,
>
> This is great! Thank you for taking the time to write this.
>
> Having only experimented with centre fed dipoles as base antennas over the years these end feds open up a whole new set of placement possibilities for me. I have to confess prior to this I thought of (random wire) end feds as non resonant compromise antennas. Yet another shattered paradigm for me.
>
> Come spring I will in fact be trying these out in place of my current dipole. I'll source and order the torriod cores now and I will surely keep you posted. Also I think a 160m end fed will be a worthy project this summer.
>
> So height above ground of the end feds will have the same effect on take off angle as it does with dipoles?
>

______________________________________________________________
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]

briancom

Re: EFHWD

Yes, if you can feed power to it.

I don't understand all the innuendo about what works when some numbers
can put things into perspective.

Here are some EZNEC numbers. A 33' (1/2 wave on 20) wire on 20M with
one end at 2' and the other at 25'

Feedpoint % from end Z SWR
1.2 2445-9196j >100
6 746 -919j 39
11 301 -342j 14
15 230 -175j 7

This strongly indicates that some counterpoise of about 10% above the
ground (remainder of 33' in air) should be used to bring the Z down to
reasonable values for matching. Regardless, there will be a large
complex value of Z to null out.

73 de Brian/K3KO

On 2/12/2017 16:19 PM, Don Wilhelm wrote:

> Brian,
>
> I repeat what I have posted several times:
> A resonant dipole radiates the same no matter where it is fed - center,
> end or anywhere in between makes no difference in the radiation pattern.
>
> In other words, a dipole is a dipole, is a dipole.
> The dipole refers to the current/voltage distribution, and not to how it
> is fed.
>
> 73,
> Don W3FPR
>
> On 2/12/2017 11:03 AM, Brian Pietrzyk wrote:
>> Hi John,
>>
>> This is great! Thank you for taking the time to write this.
>>
>> Having only experimented with centre fed dipoles as base antennas over
>> the years these end feds open up a whole new set of placement
>> possibilities for me. I have to confess prior to this I thought of
>> (random wire) end feds as non resonant compromise antennas. Yet
>> another shattered paradigm for me.
>>
>> Come spring I will in fact be trying these out in place of my current
>> dipole. I'll source and order the torriod cores now and I will surely
>> keep you posted. Also I think a 160m end fed will be a worthy project
>> this summer.
>>
>> So height above ground of the end feds will have the same effect on
>> take off angle as it does with dipoles?
>>
> ______________________________________________________________
> 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]