SWLing Post Message Board

Yes, played with the mode (thanks!) and this looks incredible. I knew you'd like that; on saltwater or coastal terrain this little loop seems a miracle :D The F/B ratio seems to be whopping 20dB minimum above 10 MHz, can also be 30dB elsewhere, of course we're talking losses and not gain here Sure,...

as for the balun box and the loading resistors, I think that a pair of small "electrical junction" boxes may fit pretty well, and willing to add a preamp, a third box, placed below the bottom of the diamond should fit I already have 1m plastic cable channel profiles to craft a cross-shaped...

A box with 525 resistors is on its way to me (plus another one with 500 capacitors because I needed one of those too). :D Going to source 2.5mm wire tomorrow and I already have 1m plastic cable channel profiles to craft a cross-shaped support from (76cm sides is an extra challenge for 1m long profi...

Some updates on the "experiment", leaving the other parameters almost unchanged (side 76cm, height of bottom corner from ground 3m, the wire forming the loop has a diameter of 2.5mm, the resistor has a value of 530 Ohm, the feedpoint hosts a 9:1 transformer) I moved the feedpoint of the lo...

as for pattern, here are the radiation patterns of the loop placed at 3m above ground on average terrain on the "classic" bands (160, 80, 40, 20, 15, 10 meters) https://i.postimg.cc/N0bxTDvs/dirloop07.png as you can see, the vertical aperture becomes narrower (and lower) when frequency rai...

Another note, I forgot to write that the antenna SWR curve "flatness" is also dependent on the diameter of the conductor, in the model I left the diameter to 5mm (0.00250m radius) as for the Matt Roberts (KK5JY) "SRL" antenna, lowering the wire diameter to 2.5mm will cause the SW...

update: ran some tests and, slightly changing the length of the side it's possible to relieve the FM band "issue", by shortening the side to (about) 65cm or lenghtening it to (about) 80cm the gain in the 70...120 MHz range goes back to negative and may avoid issues with FM "blowtorch&...

:( I hope this is nothing serious and that you'll get better soon! I hope that too, and hope it will be over in a while, but let's move on :) 1. Height flattens the lobe but above 14 MHz, it looks like more than 3-5m can have the opposite effect: You're further confirming my observations, to mantai...

as for height effect on this antenna this first image shows how the pattern changes when we change the antenna height https://i.postimg.cc/tJs1JjdH/dirloop01.png as you can see, raising the antenna we lower the radiation lobe so cutting off more and more the sensitivity to high angle signals while i...

Hi Andrew, Hi there, Ollie :) ! This is super exiting! I meant to comment on your cardioid loop thread but my reply would've created a new page and pushed your great post to the previous one. What I meant to comment on that thread is that the "cardioid loop" concept looks particularly pro...