In the ARRL antenna handbook (and repeated elsewhere) is a design for a 160m shielded rx loop antenna with 5ft square sides. Can anyone advise me how the strength of the recovered signal would change
I have been doing some basic modelling of vertical antennas using EZNEC for a while but have not paid much attention to the impact the L-match has on the system (particularly losses in the coil) and
Thanks for the input so far. Ed K4SB asked how I determine the L-match components.. I use the following website to match what the model gives me to 50ohms. The network I use is the second down on the
Terry, Thanks very much for the model and the explanation and taking the time to do it... I see what you have done, in that the capacitor has gone to ground effectively in parallel with the coil. My
Andre, Would you be able to lay a reasonable number of radials? at 15m to 25m length, 60 plus would be good. If so I would suggest a vertical. Its height perhaps depending on what you feel the neighb
Following on from the antenna modelling I did a with EZNEC a few months back I am now building the antenna and planning the ground system. I want to do some measurements of the antenna (approx 48ft v
I thought that a conventional 80m/40m trap dipole had the trap resonant at 40m, I have now read a number of different fragments of information that say that this is not the best approach and that the
I have what I think is a significant discrepancy between my model and reality, I would be interested if anyone on the list might be able to offer any insight or explanation. The antenna is a custom T
First thanks to those who helped a few weeks ago with my question about the significant differences between my model and reality for my 62ft vertical on 80m. The concensus was, go with what it is mea
This question is a long shot, but knowing the resourcefulness of the group I thought I would ask anyway.. I am doing some comparisons of various receive antennas, some of which have very different ga
I should have added that I am using EZNEC+ V5 73, Dave This question is a long shot, but knowing the resourcefulness of the group I thought I would ask anyway.. I am doing some comparisons of various
Thanks to all who have replied. I must apologise for the mess I made of asking the question, looking back I did not make myself at all clear, and congratulation to Terry for seeing through the confus
This may be slightly off-topic but hopefully not too much!! I would like to build a vertical dipole for 20m with the bottom about 1m off the ground, to compliment a beam, to give me a quick omni-dire
First, thanks to all who have responded both on and off the reflector, with some very useful information. I would just like to add my reasoning for asking the original question. As well as the RF per
For the last few years I have just been matching my topband vertical or inverted L antennas by using a 1:4 UNUN I have just seen the following article by Jay at Array Solutions.. http://www.arraysolu
I would just like to thank all who have replied both on and off the reflector. The discussion has resolved a problem I have had for many years, so I am very grateful for that. I have now done some us
I would like to build a Moxon antenna for 18MHz. It will only be used as a temporary antenna. For mechanical reasons I would like to implement the long sides in ali tube, and the short sides with wir
I wonder if anyone has an EZNEC model of the cushcraft element for the D3 dipole or an element of the A3S beam. I would like to investigate a couple of ideas.. I have noticed that the element spacing
I would be interested in whether it is possible to design a 3-element HF yagi (with tapered aluminium tubing) that has a frequency independent feed. I am willing to compromise top-notch performance f
Guy, Thanks for the information. (I meant NEC-2 not NEC-3, and Yes, I appreciate EZNEC is not an optimiser.) Ok there would be some technical issues to resolve, but the main question still remains -