Thank you for all the input.
Antennas are a fun thing to talk about and something every one seams to
enjoy and building their own, like I do. I had many wires antennas in the
last 46 years. I am still learning. One thing I have not done is get a
computer program for my Apple Computer and an ant
We are well past the posting limit for a single topic. Let's give this one a
rest for now.
73,
Eric
List Moderator etc.
elecraft.com
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Hi Guy
same thing here I was going to use it on 160 but really like 75
makes a good DX antenna and when the band is open I have
no problems breaking pileups,,, up 40 Ft and out ? Horz
works OK on all other harmonic related bands ,,, did run some tests with
a station 30 miles from me. I used to us
An end-fed half wave inverted L (EFHWL) done properly works very well. It
needs to be tuned at the base of the wire against ground.
An EFHWL for 80m is an excellent antenna that has no nulls and has
vertically polarized low angle radiation equal to a decent 1/4 wave
vertical. The horizontal wire f
- Original Message -
From: "jim"
To: "elecraft"
Sent: Saturday, July 5, 2014 10:24:19
Subject: Re: [Elecraft] A Good Antenna Length?
On 7/5/2014 2:05 AM, David Cutter wrote:
> You might consider an off-centre-fed dipole with appropriate balun and
> choke.
gt; From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of David
> Cutter
> Sent: Saturday, July 05, 2014 1:30 PM
> To: elecraft@mailman.qth.net; j...@audiosystemsgroup.com
> Subject: Re: [Elecraft] A Good Antenna Length?
>
> Rick DJ0IP has performed many hundreds of cmc measurem
@mailman.qth.net; j...@audiosystemsgroup.com
Subject: Re: [Elecraft] A Good Antenna Length?
Rick DJ0IP has performed many hundreds of cmc measurements over the last
year or so. He has yet to publish his complete findings but here is a
taste:
http://www.dj0ip.de/cmc-test/
http://www.dj0ip.de/cmc-test/the
ubject: Re: [Elecraft] A Good Antenna Length?
On 7/5/2014 2:05 AM, David Cutter wrote:
You might consider an off-centre-fed dipole with appropriate balun and
choke.
Not if you're going to run power. An off center fed antenna generates high
common mode voltage, which will fry even the best cho
Subject: Re: [Elecraft] A Good Antenna Length?
Off center fed dipoles, Windoms and end fed half waves are primarily low
power if not QRP antennas where you can do poorly with any antenna. They are
prone to arcing, heating and RF where you don't want it. You are better off
some that it was supposed to work on, no sign of any resonance
at all.
Dave (G0DJA)
- Original Message -
From: "Jim Brown"
To:
Sent: Saturday, July 05, 2014 2:24 PM
Subject: Re: [Elecraft] A Good Antenna Length?
> On 7/5/2014 2:05 AM, David Cutter wrote:
>> You migh
Lots of guys have good results with OCF dipoles all over the world.
I run a weekly nationwide net for a Brand X radio model using a 40-6
meter OCF dipole. I am the loud signal and I hear all and they all
hear me. Of course it helps I am in the Midwest, but still, I run 700
watts into it and
esonances outside of the Amateur
bands and, on some that it was supposed to work on, no sign of any resonance
at all.
Dave (G0DJA)
- Original Message -
From: "Jim Brown"
To:
Sent: Saturday, July 05, 2014 2:24 PM
Subject: Re: [Elecraft] A Good Antenna Length?
> On 7/5/20
0DJA)
- Original Message -
From: "Jim Brown"
To:
Sent: Saturday, July 05, 2014 2:24 PM
Subject: Re: [Elecraft] A Good Antenna Length?
> On 7/5/2014 2:05 AM, David Cutter wrote:
>> You might consider an off-centre-fed dipole with appropriate balun and
>> choke.
>
>
uly 05, 2014 2:24 PM
Subject: Re: [Elecraft] A Good Antenna Length?
On 7/5/2014 2:05 AM, David Cutter wrote:
You might consider an off-centre-fed dipole with appropriate balun and
choke.
Not if you're going to run power. An off center fed antenna generates high
common mode voltage, which wil
Hello,
I can recommend reading the following:
http://hamwaves.com/cl-ocfd/index.html
The high common-mode signals are apparently well attended to.
Per-Tore / LA7NO
On 5 July 2014 16:24, Jim Brown wrote:
> On 7/5/2014 2:05 AM, David Cutter wrote:
>>
>> You might consider an off-centre-fed
On 7/5/2014 2:05 AM, David Cutter wrote:
You might consider an off-centre-fed dipole with appropriate balun and
choke.
Not if you're going to run power. An off center fed antenna generates
high common mode voltage, which will fry even the best choke when
running power. I wouldn't consider suc
You might consider an off-centre-fed dipole with appropriate balun and
choke. A dual core balun that gives good cancellation of common mode
currents at the feed point is essential and some folks add another choke on
the ground with ground spike on the house side to drain off residual cmc.
If y
craft" ; "Jim GM"
Sent: 7/4/2014 6:20:40 PM
Subject: Re: [Elecraft] A Good Antenna Length?
On Jul 4, 2014, at 4:01 PM, Nr4c wrote:
I once worked a friend who'd just moved and was using a "GutterTron"
ant in the CQWW. Yeah, the gutter and downspout fed against
am Shack In The Continental USA
-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Nr4c
Sent: Friday, July 04, 2014 7:01 PM
To: Jim GM
Cc: Elecraft
Subject: Re: [Elecraft] A Good Antenna Length?
Oops,
Jim
I use two antennas here at my place.
For 80 and
102 feet.
There is nothing magic about 102 feet if you feed it with open-wire line.
Having a decent match at the feed point doesn't mean squat because
feed-point impedance is transformed by the feed line and what you get at
the transmitter end won't be the same as at the feed point unless feed-lin
-boun...@mailman.qth.net] On Behalf Of Wayne
Burdick
Sent: Friday, July 04, 2014 6:15 PM
To: Jim GM
Cc: Elecraft
Subject: Re: [Elecraft] A Good Antenna Length?
Jim,
Try 102 feet (or so) for each leg of a dipole fed with twinlead or open-wire
line. This is not a close multiple of a half-wave on any
A few years ago I took a cue from a usenet posting by Walt, W2DU, that
stated that the 102 foot doublet of the G5RV is a good antenna on 80m
when fed with twin/window lead and a tuner as it is 3/8 of a wavelength
on that band. I carried it further and have a 204 foot doublet fed with
450 ohm windo
On Jul 4, 2014, at 4:01 PM, Nr4c wrote:
> I once worked a friend who'd just moved and was using a "GutterTron" ant in
> the CQWW. Yeah, the gutter and downspout fed against a ground-rod.
>
> Another friend loaded up the liner in his chimney, called a GutterTron.
I worked all over the count
Jim,
Try 102 feet (or so) for each leg of a dipole fed with twinlead or open-wire
line. This is not a close multiple of a half-wave on any band from 160-6
meters, so it stands a chance of providing a reasonable match on all bands.
If the internal tuners can't find a match on one or two bands,
Oops,
Jim
I use two antennas here at my place.
For 80 and 160 I use a 170 foot long wire running from just over my feed line
entry to a point 40 ft below a branch on a 75 ft pine, up to to the branch and
over to another tree ( kinda like a "Z"). This is fed to an "L Match" made from
a sectio
On Jul 4, 2014, at 3:34 PM, Don Wilhelm wrote:
> Why do you need a tuner with a well designed fan dipole. The lengths of each
> set of wires can be trimmed to allow coax feed.
>
> I have 2 fan dipoles here, one for 20, 15, and 10 and another for 30, 17, and
> 12 meters. Each fed with a sing
Why do you need a tuner with a well designed fan dipole. The lengths of
each set of wires can be trimmed to allow coax feed.
I have 2 fan dipoles here, one for 20, 15, and 10 and another for 30,
17, and 12 meters. Each fed with a single coax.
Restricting them to 3 bands simplifies the tuning
> Just does not have enough
> isolation from ground. yet it presents a good match. Go figure.
A dummy load presents a good match. It just doesn't get out well.
Trying to have one antenna do 160-6 meters is just too much if you care about
getting out. One antenna can do a fair job on two bands
Why not consider a fan dipole. 160, 40, and 17 ?? Model it on an antenna
program. You're still going to need a tunner .
Sent from my iPhone
> On Jul 4, 2014, at 2:21 PM, Jim GM wrote:
>
> What antenna lengths are you using on 160M with your KX3 or KXPA100
> internal tuner? What is best f
Jim,
A lossy balun will provide a good match - just the same as a dummy load
resistor provides a good match (that is a near 100% loss if you are
considering the radiation capability).
Everything that loads does not make a good radiator.
73,
Don W3FPR
On 7/4/2014 6:16 PM, Jim GM wrote:
I ha
I have tried a 6:1 balun at the feed point of the inverted L. How ever it
presents a significant loss while QRP with 5 W. Just does not have enough
isolation from ground. yet it presents a good match. Go figure.
--
Jim K9TF
__
Elecraft
Jim,
Having one antenna to cover 160 meters through 6 meters is asking a *lot*.
But I would suggest starting with a halfwave on the lowest frequency band.
If that is a half wave on 160, then the pattern will begin to break into
multiple lobes beginning at 20 meters and up. Whether those lobes w
32 matches
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