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Founded: Jun 7, 2004
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Edginton QW Loop beacon-test on 160 Meters
For the next couple of weeks, a test of a 160 meter Ben Edginton Quarter-Wave loop antenna will be underway. The frequency will be 1900 kHz LSB up until about...
Dec 24, 2012
Strange Loop Antenna
I have just created an album in the photo section and posted a photo of a strange antenna at the Denver International Airport. I initially thought that this...
Dec 23, 2012
Pixel vs. Wellbrook
My QTH is located about 1/2 to 1 mile from all TV, most FM, all Public Safety Radio transmitters. In the other direction, I have 4 AMBC stations. In effect,...
Dec 23, 2012
Seasons Greetings !!!!
Hi, Seasons greetings and a healthy 2013 to all members of the group. 72, Brian, GØNSL. Hi, Seasons greetings and a healthy 2013 to all members of the group. ...
Dec 22, 2012
160m Loop: pro's, con's, model's, build
Anyone have a 160m loop up? How high off the ground? How fed? How does it work? Any pro's, con's methods in using/building? Anyone model a 160m loop using 450...
Dec 12, 2012
Hi: I need help to design a circle loop antenna to receive frequencies (150-350)kHz long wave SWR=1 [email] y.almuhandesa@...[/email] Thanks....
Dec 4, 2012
loop antenna - has to be in resonance?
Hello. I modeled a loop antenna with lumped components in LTspice. My loop is matched the same way as at the last picture on ...
Dec 1, 2012
I talked to a guy the other day that had a horizontal loop that was supported by two lengths of conduit making it 20" off the ground. With a kw input it ...
Nov 28, 2012
140 ft loop plus Vertical
Hi, I am new to the group and have a question. i have a 145 foot loop that i use on 20 meters. My signal goes Nw to SE. today i put up a 20 meter vertical...
Nov 26, 2012
Dual Transistors for Active Negative Inductors
While searching for dual transistors that are suitable for use with the active negative inductor circuits I came up with, I came across some interesting...
Nov 25, 2012
Function of Shielded Receiving Loop
Hallo folks, I hope, there are some "experts" in this group to answer me a fundamental question and help me understand how loops work. As protection against...
Nov 25, 2012
Ugly Balun (choke)
Has anyone figured out the math to an UglyBalun (UB), so we could optimize it for the bands we use it on? To me the UB coax appears to be 'short
39; a number of...
Nov 17, 2012
Twinhexloopantennas by Everett Sharp N8CNP
Everett, I did take a look at the file you downloaded in the files section. These are really beautifully made antennas, it is always a joy to see at a job...
Nov 14, 2012
3m Diameter, 10Mhz, Magnetic Loop
Hi All, Just a quickie, to advise, those that may be interested in Magnetic Loops, that I've been playing with 3m diameter loop, as an intermediate step to...
Nov 11, 2012
To Balun, or not to Balun, that is the ?
Hey gang, One of the trees holding my 80 mtr horizontal loop came down (thanks to Sandy), so this weekend was spent workin on the ole antenna. I've always...
Nov 10, 2012
Re: Dual Transistors for Active Negative Inductors [3 Attachments]
... me ... What bias voltage and current are you using? Looks like the solid line is signal current and the dashed line is phase. If you place a 5-ohm resistor...
Nov 3, 2012
Actual comparisons of my Loop antenna VS. the Whip
Tonight I conducted a number of experiments comparing the two antennas. I tuned FCH-344 which has a reasonably strong and steady signal here, then first...
Oct 28, 2012
Loop gain lower when wet?
Hi All, The tunable LF loop that I put up a couple weeks ago seems to be affected a bit when thoroughly wet. Just possibly there may be some additional path...
Oct 22, 2012
small (magnetic) loops and tuners.
Morning all, I am new to HF and have to struggle with Attic Antennas. I have a relatively large 86 foot horizontal loop in the attic and it tunes fairly well...
Oct 17, 2012
Tuning a magloop
I want to make a magloop and put it up in a tree if i make it for 20m by using a halfwave length. do I need the tuning cap if I already have a tuner in use in...
Oct 10, 2012
My new Loop antenna is completed and installed
OK, Today I wound the coil on the loop frame, installed the rotator and then had the neighbor help me get the entire thing up on the roof and installed on the...
Oct 9, 2012
A somewhat asymmetrical loop. . .
Well, today I bought the PVC pipe for the tuned loop antenna. The plans were to make it an "X" (Actually a "+"
) with four 3 foot cross-arms, all joined in the...
Oct 4, 2012
Flag version !!!!!
Alex, Thanks again for the comments on your antenna sizes, erected the 10ft base version yesterday, 360° rotation with base 3ft agl, excellent results, many...
Oct 2, 2012
Flag antennas !!!!
Hi All, I am contemplating erecting a rotateble Flag type antenna but some of the Internet sized versions assume you have a huge plot of land not a suburban UK...
Oct 1, 2012
HF Antenna coil characterizing ???
I have few naked coils for half wave dipoles. I'd like to measure the coil characteristics to insure I use them properly and duplicate home-made replacement...
Sep 30, 2012
Active Negative Inductors
I removed both of the files related to active negative inductors from the group files section. A revised version of the one active file can now be found on my...
Sep 29, 2012
First NIC based loop amplifier that seems to work
Hi all, I've continued to work on NIC (negative impedance converter) based amplifiers for small loops antennas. As well known a small loop has an impedance of...
Sep 27, 2012
removal from group
hello, can I be removed from the group. thank you...
Sep 25, 2012
80 Meter Loop(interference problem?)
Sorry to sound so dumb on wire strength but this question concerns a little of both I want to put up an 80 meter loop, using 18 GA speaker wire supported by...
Sep 23, 2012
found this on k7hkL web page might help someone http://qrp.webhop.
Sep 23, 2012
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