Don,
The fan antenna was a lashup in the attic in hopes of having another
antenna, hopefully to use with the K2 upstairs in the office. If it
worked out, great; if not, no big deal. The attic isn't easy to get into
(no pull-down), and not a lot of room to stumble around up there.
The final
On 04/11/2011 04:11 PM, Wayne Conrad wrote:
My radio (K2 with the internal ATU) hasn't shipped yet, but that
shouldn't stop me from putting up an antenna, right? If only I knew
what to put up, that is. That's where I'm asking for help.
(snip)
Thank you to everyone who replied, both
FWIW, see my fan antenna at
http://wilcoxengineering.com/projects/amateur-projects/39-fan-dipole
A bright idea that didn't work out so well!
Cheers, Alan
Alan D. Wilcox, W3DVX (K2-5373, K3-40)
570-321-1516
http://WilcoxEngineering.com
http://eBookEditor.net
On 4/15/2011 3:15 PM, Alan D. Wilcox wrote:
FWIW, see my fan antenna at
http://wilcoxengineering.com/projects/amateur-projects/39-fan-dipole
A bright idea that didn't work out so well!
If I had a dollar for every Gee, it seemed like a good idea at the
time situation I've found myself in, I'd
Alan,
Sorry to hear about your lack of success with the fan dipoles. I have
three of them - one for 80 and 40, another for 30, 17 and 12m, and yet
another for 20, 15, and 10. They work very well.
My secrets - space the wires for each band away from one another - my
80 and 40 antennas are
so often
found on 75.
Ron AC7AC
*Wire fed at the center but not necessarily a dipole - i.e. 1/2 wavelength
long - on any band.
-Original Message-
Subject: Re: [Elecraft] K2 + ATU + Loop antenna in the attic
Alan,
Sorry to hear about your lack of success with the fan dipoles. I
but not necessarily a dipole - i.e. 1/2 wavelength
long - on any band.
-Original Message-
Subject: Re: [Elecraft] K2 + ATU + Loop antenna in the attic
Alan,
Sorry to hear about your lack of success with the fan dipoles. I have
three of them - one for 80 and 40, another for 30, 17
I have had two fan dipole in use maybe 15-20 years ago, before the time of
widespread use of auto tuners. One was a commercial model, with the various
lengths of wire on each side of the center insulator spaced about an inch
apart (spacers were used). I did not have so much success with it. The
That's a sign the dipole is significantly unbalanced or you have common mode
signals getting into the receiver. The balun is supposed to take care of the
common mode suppression, but that often depends upon the impedance it sees,
which varies widely in a tuned feeder system.
A truly balanced
On Fri, Apr 15, 2011 at 7:16 PM, Ron D'Eau Claire r...@cobi.biz wrote:
the efficiency, ease and simplicity of a doublet*
fed with open wire line...
Ron is so right. At the risk of re-re-repeating myself, whether or not an
antenna is resonant, or matches coax, has nothing to do with its
Wayne,
If you have no choice and have to use an antenna in the attic placed close
to the rafters, I would suggest that you do use iinsulators to prevent any
part of the antenna touching a rafter. A fire risk could exist if the
antenna's wire is simply laid on the rafters, especially if using
Wayne :
You got some good advice so far.
I am in agreement that an outside antenna will perform better than one in the
attic but
you can always start with an attic antenna and add an outdoor antenna later.
An attic antenna makes a great backup antenna as it will not succumb to severe
weather
My radio (K2 with the internal ATU) hasn't shipped yet, but that
shouldn't stop me from putting up an antenna, right? If only I knew
what to put up, that is. That's where I'm asking for help.
I want to start out with an loop antenna in the attic. Why loop? Mostly
the very American idea that
...@mailman.qth.net] On Behalf Of Wayne Conrad
Sent: Monday, April 11, 2011 4:12 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] K2 + ATU + Loop antenna in the attic
My radio (K2 with the internal ATU) hasn't shipped yet, but that
shouldn't stop me from putting up an antenna, right? If only I knew
what to put
Wayne,
I understand your reasons for putting an antenna in the attic, but that
will offer no additional lightning protection over putting it outside.
An outside antenna will pick up more noise from the house wiring, so why
go to the trouble. Even if you mount your loop antenna on short
On 4/11/2011 4:11 PM, Wayne Conrad wrote:
I want to start out with an loop antenna in the attic. Why loop? Mostly
the very American idea that more wire must be better, plus it's
balanced--I hope to not need a separate RF ground, or counterpoises, or
any of that jazz).
You need a safety
A loop in the attic is asking for coupling to all those nearby conductors. They
will do
the following:
1) Capture and dissipate your precious RF. No-one will hear you.
2) Couple large amounts of electrical noise into your receiver. You will hear
nobody.
3) Pick up even QRP levels of RF and
Wayne, like many members of this list, I've been right in your shoes.
Like the previous posters, I'd recommend getting your wire outside. Here's a
specific recommendation:
While waiting for your radio to come, build a 4:1 unun. Here's a website
with instructions:
On Mon, Apr 11, 2011 at 7:11 PM, Wayne Conrad wrote:
I want to start out with an loop antenna in the attic, etc
Wayne, you've already gotten some pretty good advice on this subject.
May I add my two cents' worth here?
First, you did not make it clear at all if your attic antenna is a
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