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Re: Another Loop Page
Snarff! The formatting seems to have messed up the link in my last
post. Nip on over to the Links section and you will find that I have added it there and it works. --- In loopantennas@..., "Michael Hebert" <qrpbear@y...> wrote: I just ran across a page with some nice illustrations, photos andhas not built a loop before. They answer a lot of the "newbie"questions. < rials1.html> |
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Another Loop Page
I just ran across a page with some nice illustrations, photos and
plans for MW/LW loops. I hadn't seen this one before. The instructions and illustrations are very good... especially if one has not built a loop before. They answer a lot of the "newbie" questions. Here it is... < rials1.html> Have a look-see. 73, 'Bear' NH7SR |
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Re: Very nice inductance/capacitance meter
Steve,
I haven't contacted him about the DFD2 not working yet. I really should though since the counter worked fairly well during the time it was working. Not as well as my Oak Hills DD-1 but fairly well anyway. I may just be overly picky when it comes to PC board quality. I've built several Small Wonder Labs kits, a couple from Oak Hills and a couple from the AMQrp club. All with nice fiberglass boards, solder masking, plated through holes, etc. That's kinda spoiled me <G> 73, 'Bear' NH7SR --- In loopantennas@..., Steve Greenfield <alienrelics@y...> wrote: The quality was very good. It's not a perfect design, his cut-outs~->
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Re: Very nice inductance/capacitance meter
The quality was very good. It's not a perfect design, his cut-outs
in the box are a bit messy and I don't like the banana sockets sticking up as I can't just toss it in a case and into my toolbox without worrying about breaking them. But otherwise I thought it was good. Had it for well over a year, working great. Did you contact him about your problems? Steve Greenfield --- Michael Hebert <qrpbear@...> wrote: Steve,--------------------------------------------------------------------~->
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Re: Very nice inductance/capacitance meter
Steve,
How's the board/component quality on this kit. I bought his DFD2 frequency counter and was extremely disappointed with the quality. Paper phenolic board, cheapie components, worked for two weeks and went belly up! I've been looking at the LC meter but I'm hesitant to buy one. 73, 'Bear' NH7SR --- In loopantennas@..., Steve Greenfield <alienrelics@y...> wrote: I bought this kit, also available assembled: |
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Very nice inductance/capacitance meter
I bought this kit, also available assembled:
Very nice, from 1nH to 150mH, and .01pF to 1.5uF. Has an internal reference that it calibrates itself from each time you turn it on. Steve |
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Re: The Geomantic Spiral
Michael Stevenson
开云体育Thankyou Bear for the very detailed picture of your
QTH and surrounding area, let's hope you don't get a tidal wave. Perhaps being
so close to sea level helps connects your antennas or ground plains to the sea
itself, we all know how good the sea is (or large bodies of water) at being
terrific gound plains for transmitting and receiving HF signals, maybe this is
why the Geomantic Spiral works so well on the ground.
Would be interesting to hear about this fascinating
antenna at other different locations and altitudes (above or away from the sea).
I live close to the sea which is around 3 miles to the south east and my QTH
would be around one to two hundred feet above the sea. I wonder how this type of
antenna would work for someone living in the mountains?
Should be very interesting days ahead as this
antenna is developed and experimented with by more people.
Thanks again Bear and best regards!
?
Michael Stevenson,
Australia. (Port Macquarie in the state of New
South Wales on the east coast of Australia.)
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Re: The Geomantic Spiral
Michael,
My QTH is a typical(?) urban environment. I live on the ground floor of a 3-story apartment building. My apartment is in the roughly NE corner. The ground elevation here is about 10' above sea level (I'm in a tidal wave inundation area). There is a large 25 story building only 50' to the North of me and several other tall buildings surrounding me within a 1/4 mile radius. I am also surrounded on all sides by elevated electrical, telephone and cable TV lines within a radius of 100 to 200'. There is a small park next to my building on the East and Southeast side. Perhaps 1 acre or a little less in area. There are a couple of very large, old Ficus trees growing there as well as some other smaller trees. My lanai area is only about 8' wide by 20' long. There is a Mock Orange hedge some 8' tall between me and the park. My 23' vertical antenna is located at the NE corner of the building and is only 2' from the side of the building. The lower section of it is 18" away from a 6' high chain-link fence. There are 3 elevated 24' radials connected to it as well as 1 24' buried radial. My loop antenna is on the roof of the apartment house and connected through a 100' RG-58 cable run. Currently the loop is acting intermittently. I think I have a loose connection up there that I will need to fix. The Geomantic Spiral is under the bricks in the barbeque area of the lanai about 3' from the side of the building. This is obviously not a "dream" DX location!! Despite that I have been able to make some pretty decent contacts with QRP operation on the 30 and 20 meter ham bands around the Pacific and into South America while running only 2 watts output. The plus side to this location is that it provides me the opportunity to play with and develop various types of antennas that will be effective in a "less than ideal" kind of environment. 73, 'Bear' NH7SR --- In loopantennas@..., "Michael Stevenson" <portstevos@t...> wrote: Sound's great and will certainly have to give it a go after my loopis upon it's final mounting. What is your QTH area like Bear? Is it flat or are you in a valley or hollow or are you on top of ahill or on the side of a hill? Any trees or buildings around close by?at will. I don't have a camera at present so there won't be anyphotos for the time being. I'll see if I can whip together some kind ofand how the Geomantic Spiral works. Looks like a promising area forideas I want to play with also.right now is any indication this hy'ar animule may turn out to be avery good Tropical Band antenna.new geomantic Spiral antenna, very interesting stuff. When you areready you will have to give a photo and more detailed constructionnotes, could be a nice antenna to play with (after I finish the 14 footloop of course!)which I amRG58 coaxunder some---- ----------Terms of Service.---------- Yahoo! Groups LinksService. |
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Re: The Geomantic Spiral
Michael Stevenson
开云体育Sound's great and will certainly have to give it a
go after my loop is upon it's final mounting. What is your QTH area like
Bear?
Is it flat or are you in a valley or hollow or are
you on top of a hill or on the side of a hill?
Any trees or buildings around close
by?
Thanks for the reply and best regards!
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Michael.
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Re: The Geomantic Spiral
Michael,
Thanks for joining. I have set you to unmoderated so you can post at will. I don't have a camera at present so there won't be any photos for the time being. I'll see if I can whip together some kind of drawing. I haven't done any kind of analysis yet as to the why and how the Geomantic Spiral works. Looks like a promising area for experimentation and learning. I'll still be hanging around here, of course. Got lots of loop ideas I want to play with also. BTW, if the signal I'm receiving on 3.925 MHz from NHK Tokyo right now is any indication this hy'ar animule may turn out to be a very good Tropical Band antenna. 73, 'Bear' NH7SR --- In loopantennas@..., "Michael Stevenson" <portstevos@t...> wrote: Hi Bear,geomantic Spiral antenna, very interesting stuff. When you are ready you will have to give a photo and more detailed construction notes, could be a nice antenna to play with (after I finish the 14 foot loop of course!) Nice new group Bear and hope it does well for you!am calling the Geomantic Spiral. It's nothing more than 30' of RG58coax rolled into a tight, flat spiral and placed on the ground undersome bricks on my lanai (patio to you Mainland folk).listening results in my new group at...---------- Yahoo! Groups LinksService. |
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Re: The Geomantic Spiral
Michael Stevenson
开云体育Hi Bear,
Just joined the group and checked out your early
results of the new geomantic Spiral antenna, very interesting stuff. When you
are ready you will have to give a photo and more detailed construction notes,
could be a nice antenna to play with (after I finish the 14 foot loop of
course!)
Nice new group Bear and hope it does well for
you!
Best regards!
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Michael Stevenson,
Australia.
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The Geomantic Spiral
Gents...
I have built my first geomantic (ground-coupled) antenna which I am calling the Geomantic Spiral. It's nothing more than 30' of RG58 coax rolled into a tight, flat spiral and placed on the ground under some bricks on my lanai (patio to you Mainland folk). Performance is _very_ good!!! I have posted a more detailed description and preliminary listening results in my new group at... <> Drop in and check it out. Everyone is welcome. 'Bear' NH7SR (Doing happy Snoopy dance) |
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Re: Whoo hoo!
Steven S. Coles
Steve,
Ninty messages in the first week! You have one hot group here! Regards, Steven --- In loopantennas@..., "Steve" <alienrelics@y...> wrote: We're up to 55 members! And lots of activity.moderated. So don't be alarmed if your first message takes a few hours or aday to appear. I get on fairly often to check, subject to Real Life(tm). quietly blocking spammers. |
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4 foot loop antenna and other antenna projects.
Adam Ebel
I am thinking about getting some wood , and build a 4 foot
loop, cause my broadband loop has got the winding less than 10 turns. Are there any other projects that I should try out to dramatically improve my AM and LW reception? I will take notes. Adam Ebel Thanks. |
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Another Interesting Compact Antenna
There's another compact antenna with its own new group here on Yahoo
at... <> There isn't much there yet but a few pictures and a link to the owner's home page. The antenna he describes is a form of ground independent coaxial monopole helically wound on a plastic flowerpot. It is tuneable by adding a variable capacitor across the far end of the antenna. There is a photo illustrating it. Throw an arrangement of plastic flowers in the pot and you have a nice attractive and very stealthy antenna. Now who could possibly object to something like that on 12th floor veranda in a condo? 73, 'Bear' NH7SR |
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Re: Geomantic Antennae
Since the subject of Geomantic Antennae can get rather far afield and
lead into some other rather peculiar areas (dowsing, radionics, Ley lines, etc) I have created a new group at... <> Y'all is welcome, now, y'hear!? 73, 'Bear' NH7SR (Polishing up his dowsing rods) --- In loopantennas@..., "Michael Hebert" <qrpbear@y...> wrote: No... they ain't loops but they do offer some interesting potentialfolk like me that have limited area for antenna farming. They arestealth antennas by nature.of "gardening" to do <G>) |
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Geomantic Antennae
No... they ain't loops but they do offer some interesting potential
that seems worthy of exploration. Especially for ground dwelling folk like me that have limited area for antenna farming. They are stealth antennas by nature. I have uploaded two text files regarding them to the "Bear Cave" in the Files area. 73, 'Bear' NH7SR (Now where's my pick'n'shovel? Got a bit of "gardening" to do <G>) |
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New file uploaded to loopantennas
loopantennas@yahoogroups.com
Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the loopantennas group. File : /The Bear Cave/An Introduction to the Mysteries of Ground Radio.txt Uploaded by : qrpbear <qrpbear@...> Description : Do Geomantic antennas exist? Do they work? This article documents some of the discoveries made by early telegraph/telephone pioneers. You can access this file at the URL To learn more about file sharing for your group, please visit Regards, qrpbear <qrpbear@...> |
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Re: Homebrew Variable Capacitors
Barry Savage
Hello All:
I, too, have been playing around with this idea.? Some time ago, I bought a couple of tin (yes, real tin) plates at a hobby shop.? They were about 4X6 inches in size, and I soldered a wire to a corner of each plate, and then put them face to face with a piece of plastic wrap between them.? I bored a hole through them on one corner and attached them together with a nylon bolt and nut so I could slide them across each other.? I attached this variable capacitor to my spider-web-coil crystal set and was amazed to find it very selective.? I imagine you could do a better job using double-sided PCB material, and cut it to shape using a Dremel tool.? Then you could make multiple-plate caps very nearly like the real thing.
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So, I looked up the formula for capacitance and plate area in the ARRL handbook, and confirmed that it was in the right range.? Also, the dialectric constant of various materials is in a table near this formula.? For those of you who don't have the ARRL handbook, I would recommend it very highly.?
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I have often thought that if I ever get back into programming (Nah!, I'm retired, and gardening is a lot more fun than programming.? That was for when I was young, driven, egoistic and dumb) I would try to build a designer's Swiss army knife by combining all the formulas in the ARRL handbook.? I'm sure someone has already done this.
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Good luck with your project!? Humm, now if we had a machinist with us, mebbe they could turn the little slots in the shaft to accept the plates made by the sheet metal worker....
Later,
Barry
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Steven Greenfield AE7HD
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