Hello LF, a very interesting discussion is in progress on the reflector on ferrite rx antennas. My understanding however is that until now we have been talking about narrow-band antennas. May I ask t
Hello Jim, LF, thanks to all of view for feedbacks to my inquiry. So my rough summary is: - small-size (e.g. ferrite cored) loops need tuning = high Q to provide a reasonable signal level. - intermed
Dear Daniele, At my locaton in eastern Bavaria I am using such a vertical broadband loop pointing north from 10 kHz to 500 kHz since several years and have also made experiments with a horizontal lo
Hello Wolf, Thanks to the link to your nice to read article. I just found it a hour before your mail and already read it ;-) Well, i also prefer the usual configuration instead of that sleeve antenn
mounting the probe and an (optional) earth-rod to > > >> >>>> ground (sorry Andy!!) the shield. > > >> >>>> > > >> >>>> I might be completely wrong but isn't it the same when one uses a > > >> >>>> g
Hello Stefan, Thanks a lot for your feedback. Yesterday evening a purchased a bunch of 7 x MU400HH ferrites (10mm x 200mm each) on eBay, planning to join them together "in parallel" to form a fatter
This looks like a very good design. Fascinating easy!! Is it completely grown in your head or have you seen it somewhere in the web? What is the gain, about? I know the BC337 as a low noise NPN tran
Hello LF, while looking around on the web I found this page and thought it could be of some interest for LF experimenters: http://thayer.dartmouth.edu/inductor/intro.shtml Regards Daniele
Dear Daniele, I guess the information You want is also contained in my email, at least indirectly. A german receive-only radio amateur has built such a ferrite antenna by cut and try only and finall
Hello LF, this evening I had some free time to spend for starting my very simple tests with ferrite rods. Picture 1 in the attached zip file shows one of the rods (about 10mm diameter x 200mm long)
Hello Jim, thanks a lot for your helpful advice. However, as I'm short with free time (because of job & family duties :-)), I'm afraid I will have to stay with current build, that is three stacked 10
Hello Stefan, LF, I'm looking for a suitable preamp for my "coming sooner or later" tunable ferrite antenna (hopefully covering as much as possible of LF band with a var. cap. plus some switchable ad
Hi Joze, looks like in your antenna the coil is wound over the shield, am I correct? Regards Daniele Da: Joze Konda - S52AB <[email protected]> A: [email protected] Inviato: Marted́ 27 Settem
Hello LF, this evening I had some free time to spend for starting my very simple tests with ferrite rods. Picture 1 in the attached zip file shows one of the rods (about 10mm diameter x 200mm long) t
Hi Daniele, Looking at those alligator clips: Did you ever remove the rubber insulation, and check the connection between clip and cable, and check the 'copper diameter' of these cables ? I did, and
Hello Stefan, this morning I received the litz wire and tried another build, using a 16 mm PVC tube to enclose the 3 x ferrite rods. I wound 70 turns of litz (as good as I could) and went to the test
Hello LF, apologies for being a bit OT. I'm looking for a (reasonably) reliable method for measuring Q of a parallel LC resonator at LF frequencies (ferrite-cored coil + variable air cap). I have a s
Hi Daniele, I agree with Wolf's comments. Another thing: If you add a (switched) cap of the same C value, you will come down to the LF radio band and to the amateur band too. I took styroflex caps i
