SWLing Post Message Board

Here are some suggestions, in case you decided to buy it, that is :) First step, improve the loop; either use some copper pipe or alumium strip to make a wider and BIGGER loop (easy) Second step; match the impedance, the preamp has an impedance ranging from 1.5K down to 450Ohm, now ler's find a bala...

in such a case http://www.qrp.gr/tmaf/ :D [edit] the original filter along with infos about its working can be found here http://www.qrp.gr/tmaf/The_Magical_Audio_Filter.pdf it's basically a double audio filter implementing both a passband and a notch, the original one was mostly aimed at CW, but wi...

let' s start from an example of the kind of unit I'm referring to https://www.amazon.com/Eliminator-X-Phase-Bands-Aluminum-Signal/dp/B09B37KQ12 but there are several others using the same approach, a connection to our antenna and a connection to a so-callled "aux antenna", "noise ante...

did you already see this ?

https://rsgb.org/main/operating/beacons ... f-beacons/

also

https://www.ncdxf.org/beacon/beaconlocations.html

I just might try it in a few weeks since better weather isn't too far away. Good tip about making sure the test is on more than one band. I wouldn't think it would be of much use at LF, but MF through 30 mhz would definitely be in order. I have better antennas for vhf and higher. rayb Well, Ray, th...

Very good Andrew. Well, it was just an idea I had that seemed to have a possiblility of working. That's how we advance the state of the art... come up with an idea and test it. Thanks for your reply. Your work saves someone from spending time and physical effort that won't produce the desired resul...

Hello, I just found this forum, as well as the info on the Sula antenna. Looking over the four pages of info on this post, it seems to be a very good "all around" antenna for swl'ing, as well as it having the benefit of only one null instead of the usual loop dual null. Ok, I'm going to b...

just a short note about how to route the coax feeding the SULA; the image below shows the effect of routing the coax outside the SULA or inside it (through the center), as you can easily see, routing the coax toward the center (second image from top) heavily changes the pattern, the backside "n...

Jock, any update regarding outdoor antennas ?

I obviously like it to bits! :) No, seriously, it's not having any severe highpass/reduced sensitivity issues typical for ham transceivers on MW/LW and it has all the nice tools one would want in a MW DX radio (particularly passband tuning and notch filter), being an SDR and showing me faint carrie...