Mal, I used to have a similar problem running my ARGO computer with its old hard drive. Eventually the drive totally failed and I replaced it with a newer one off another computer and the problem no
Mal, My loop uses the same wire as the vertical antenna and radials. I use multi strand 2.5 mm insulated electrical wire. OK, that's the same as US AWG #10 which is about 15% lower in Rac per foot co
Dave S, Thank you for the words of support relative to my thoughts on how loop antennas can be the best match for ones back yard environment, and at times, the ONLY match. I hope that the 'jabbing' g
Mal, are biased towards loops (lassos). They were brought up on the ranches lassoing cattle and naturally when it comes to radio this is the way they think, and its hard to convince them otherwise. I
Jim M, I remain to be convinced about the benefits of loop TX antennas. If you have the choice of a tuned wire 15m long in total , or a 15m by 15m loop, it is not surprising that the latter is a bett
Mal, are many new operators building Hello Mike, Glad to hear that LF is booming your side of the Ocean hi, it seems to have got submerged this side !! See! You guys just have so much power that most
Costas, Hi, I have just uploaded a photo of the antenna and ground system of the Hellenic Navy LF station at Marathon. Thanks for posting this. Talk about a ground radial system!! Any idea on what th
Loop Enthusiasts, It's ironic that a came back to work during my vacation to gain access to this reflector to report a TX loop problem involving Q and find this Q = 500/D equation being discussed. Fi
John A. says: Last winter, when I ran the 50ft perimeter loop, I found that laying out several 40 foot strips of chicken wire made no difference on the impedance bridge readings. That antenna was 15
Bill, I suggest the transformer approach because when the loop conductor will have some leakage current to the trees (it's small Mal <G>) and this will be minimized if the loop is allowed to float re
Loop Admiration Society members, and friends: You may like to consider a totally capacitor matching network as shown on my website. I suggest the transformer approach because when the loop conductor
Hi Rik, I am about to put up a transmitting loop antenna. Dimensions will be 23m long and 15m high. Thanks to Dick (PA0SE) I could achieve a wheel of 7mm litz wire, so wire losses should be minimized
Hi Alex, My present loop is constructed from .63" OD copper pipe. The figure of merit for 50/50 loop antennas is the total AC resistance (Rac), including ground losses, and this one measures under 0.
Hi Mal, Sort of figured you would be popping in on this. A loop only 6db down is a BIG DOWN ie signal 4 times weaker than a vertical 6db is 6db! That's 1/2 the reading in uv/m on my SVM. You can try
Peter, When we started on 73kHz some years ago G2AJV was the first to put out a reasonably strong signal and he was using a large loop. G4JNT and G3XDV also put out reasonable signals from very restr
Mal, This is what I have been saying all along about loops and power levels around the 1W plus on LF. The only sensible antenna for transmitting on LF is a vertical to cater for medium and higher pow
Hi Gary, reflector is meant to be used for. I'm not sure what the LF reflector is meant to be used for. Are there are some rules that I have failed to see posted? other types of mail may be sent ther
Jim, I think there is a Lowfer-like solutin to this problem. Seems to me that if everything is assumed to be 'ideal' or 'loss-free' including the wires, there would still have to be a TX loop antenna
Steve says: "I have had good results with an ordinary (unbalanced) air-core loop of 10' diameter. Nulls are approaching 50 db on groundwave signals. The loop uses a standard single-turn pickup loop o
Not so sure about the balanced pre-amp, it doesn't makes double balance, only one stage should be centered, when the aerial is balanced - the connection to one side is just as good as balanced connec
