http://elecraft.85.s1.nabble.com/QRP-viability-during-solar-cycle-min-tp385539p385547.html
I've never tried that. Maybe I should.
>A related antenna with a couple dB gain is a "half-square". It's
>like half of a bobtail curtain, or two inverted L's connected at the
>ends of the horizontal parts (1/2 wave on top, 1/4 wave on the two
>vertical parts). It has a figure 8 broadside pattern, and is easily
>fed at one of the upper corners with coax.
>
>Larry N8LP
>
>
>
>Stephen W. Kercel wrote:
>
>>Kevin:
>>
>>I think vertical dipoles are wonderful. I have used them on a
>>heavily wooded lot with great success on both 20 and 30 meters. The
>>higher you can get them off the ground the better.
>>
>>It is very desirable to be sure the feedline comes off reasonably
>>perpendicular to the antenna for a quarter wavelength or so.
>>
>>Another effective trick (especially for 80 or 40) is an inverted L
>>fed with coax at the corner. Its almost as good as a vertical
>>dipole. Again, it is very desirable to be sure the feedline comes
>>off reasonably perpendicular to both legs of the antenna for a
>>quarter wavelength or so.
>>
>>However, don't be too enchanted by the low angle pattern, it is
>>also a bit lossy. If you overlay your EZNEC vertical dipole
>>elevation pattern with the EZNEC broadside elevation pattern of a
>>straight dipole at say 5/8 wavelength elevation, you'll see that
>>although the vertical concentrates its energy at low angles, the
>>actual dBi values are not that much better than the horizontal.
>>
>>W4RNL has shown that putting a very elaborate ground screen under
>>your vertical dipole gets you virtually no advantage. The losses
>>are actually from ground losses a few thousand feet from the
>>antenna. For that reason, if you're right on a seashore, you'll get
>>spectacular results in the seaward direction. (This is the Desert
>>Island effect.) I'm located near the coast of Maine, about 4 miles
>>inland; the Desert Island Effect does not help me much.
>>
>>I have both a 20 m vertical dipole (center about 20 feet off the
>>ground) and a 20 m horizontal dipole about 45 feet up. Which one
>>does better depends on propagation conditions. I have worked lots
>>of South Pacific QRP with the vertical.
>>
>>73
>>
>>Steve
>>AA4AK
>>
>>
>>At 11:20 PM 1/11/2006, Kevin Shaw wrote:
>>
>>>I've been playing around with EZNEC trying to come up with a DX antenna that
>>>will work at my QTH. The vertical dipole seems to have a fantastic pattern
>>>for DX with low takeoff angles. I may be able to hang a vertical wire dipole
>>>in one of my trees and have it nearly invisible. Anyone have experience with
>>>vertical dipoles that they could share?
>>>
>>>Thanks,
>>>
>>>Kevin
>>>N8IQ
>>>
>>>
>>>-----Original Message-----
>>>From:
[hidden email]
>>>[mailto:
[hidden email]] On Behalf Of Tony Morgan
>>>Sent: Wednesday, January 11, 2006 8:39 PM
>>>To: Elecraft
>>>Subject: Re: [Elecraft] QRP viability during solar cycle min?
>>>
>>>K9QRG ON 5/12?
>>>Just checking :>)
>>>
>>>Tony W7GO
>>>----- Original Message -----
>>>From: "Larry Makoski W2LJ" <
[hidden email]>
>>>To: "Darwin, Keith" <
[hidden email]>
>>>Cc: <
[hidden email]>
>>>Sent: Wednesday, January 11, 2006 4:54 PM
>>>Subject: Re: [Elecraft] QRP viability during solar cycle min?
>>>
>>>
>>> > Darwin, Keith wrote:
>>> >
>>> >>K1 or K2. Hmmm, the debate continues. But wait, we're approaching a
>>> >>sunspot min. My antennas are pretty limited. I have a 28 foot vertical
>>> >>(fed with a tuner near the base) for 40 thru 15 and a dipole at 25 feet
>>> >>but that is about it. No towers, no high wires, no yagis.
>>> >>
>>> >>How limiting will 5 or 10 watts (even with that Elecraft Mojo) be under
>>> >>current conditions? Are we entering into conditions where QRP with
>>> >>simple antennas will become rather frustrating? Is it K2/100 time?
>>> >>
>>> >>- Keith KD1E -
>>> >>_______________________________________________
>>> >>
>>> >>
>>> > Keith,
>>> >
>>> > Fear not fellow Elecrafter! We QRPers laugh at the sunspot minimum!
>>> > Sunspots ...... who needs 'em?
>>> >
>>> > I know, actually we all do. But to be serious .... as bad as band
>>> > conditions were in 2005, I managed to make at least one QRP CW QSO
>>> > everyday in 2005. If you want to check out some of who I worked (and
>>> > there was a goodly bit of DX mixed in) then please check out:
>>> >
http://www.qsl.net/w2lj/index%20page%209.html>>> >
>>> > My antennas are not much more substantial (if any) than yours. I have a
>>> > G5RV at 25 feet and a Butternut HF9V vertical which is ground mounted in
>>> > the backyard. To me it seems that if you don't spend too much time
>>> > concentrating on what you think are deficiencies; but go out with the
>>> > aim to just have fun, then you will be amazed at what you can accomplish!
>>> >
>>> > 73 de Larry W2LJ
>>> > K1# 1647, K2# 4090
>>> >
>>> > _______________________________________________
>>> > 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>>>_______________________________________________
>>>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>>>
>>>
>>>_______________________________________________
>>>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>>
>>
>>
>>_______________________________________________
>>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>>
>>
Subscriber Info (Addr. Change, sub, unsub etc.):