SWLing Post Message Board

As a thought, the "SDL" may be built using off-the-shelf stuff, a spool of wire, some resistors , some PVC pipes, a NooElec 9:1 v2 balun , some snap-on ferrites and optionally a NooElec LANA HF (or a similar low noise preamp) will suffice to put together the antenna; add two or three (if u...

Hmm... I have no experience with naming antennas other than giving mine the "crap" prefix, craploop, crap-pole...because I initially thought they are cheap and simple so they must be crap :mrgreen: Crapbeam sounds not very attractive. The Greyhat SLB (Small Loop Beam) Small Unidirectional...

Just for fun, if the antenna stands to the "real world test", I think we'll need to find it a name, now, I was thinking to something short and easy to remember and following the acronym "tradition" (LoG, SRL, NCPL, ...) I think that this one may be called SSB (Small SWL Beam), bu...

here are the infos

https://destevez.net/2021/12/decoding-j ... telescope/

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...