Dear LF group, for an active or passive RX loop antenna (G3LDO design or similar) I am looking for the "Litz" wire mentioned several times on this reflector. As far as I understood, it contains a num
Hi Martin, Look at http://www.amrad.org/projects/lf/FirstRvw.html I don't know the "Ropex First" Transceiver myself, but I think its main disadvantage is the lack of a VFO. There have also been artic
Hello group, As reported, the software archive was not complete. Something must have truncated the archive, though the FTP programme said "transfer completed". The correct file size of spectr_i.zip i
Hi Alan, Brian, Peter, and others playing with Spectrum Lab: I have just uploaded a slightly improved version of the program to its "main" site (not the 'beta' site, though it still has 'beta' status
Hello group, As in the past years, there will be a meeting of LF friends during the Ham Radio (hamfest in Friedrichshafen at the Bodensee, close to the HB9 and OE border). Thanks to Walter, DJ2LF, fo
Hello, I once had the chance to compare an old IC735, an IC706 and a TS850 running side-by-side connected to a tuned LF-antenna (150m long wire). Results: - TS850 with 500Hz and 270 Hz filter: Could
Hi Larry, Rik, and the group, As Rik's wrote, the dynamic range of some cheap FM transmitters is possibly just in the range of 40dB or so. But IMO, a homemade "simple but true FM" transmitter could d
Hi Larry, Bob, and the group, Thanks Larry for the info about your remote RX. It is very helpful for me to hear someone else is using such a system with such good success. The main problem here is th
Hi Mal and Alan, I can strongly confirm such QRM from modern TV sets. That also seems to be the reason why some days I "don't have ears" when operation from DF0WD. On a spectrogram, you can see the 5
Hello group, I can now confirm that some Russian ALPHA transmitters are back on air (someone must have paid the electricity bill - guess why ? ) A signal can be clearly seen and heard (with the softw
Hello Group, I just received the Info from a VLF experimenter (not a radio amateur) that the ALPHA system seems to be back on. He observed signals on 11.905kHz and 12.649kHz. I have not verified this
Hello group, Nice copy of the SAQ signal here in northwestern DL (loc JO42FD). I received the signal clean and easily readable with a very small antenna made of a bundle of ferrite rods, 400 turns of
Hello Ha-Jo and LF group, Exactly that's what I found in own experiments. By "forcing" the magnetic field through any kind of metal, you increase the losses. For the same reason, long coils shouldn't
Hello Rik and the Group, I think the DX cluster entries on 136kHz are just stupid nonsens. If you check the PACKET DX cluster (use "sh/dx 137" on a CLX cluster), you don't see this junk. There have b
In a direct mail to Uwe I called it "non-coherent signal", but it meant exactly the same as Markus (DF6NM) explained here on the reflector a few hours later. I don't think there is any mysterious ve
Hello group, I hard MB2HFC on saturday and sunday with good signal, but got no reply. I guess the 136kHz->144MHz transponder has the same problem as some AmSat's, suffering from very strong "inband"
Hi group, I you want to see a phantastic miniature "LF TX antenna" with capacitive top loading at work, look at : http://www.qsl.net/dl4yhf/experim1.html Nothing serios at all, it's more an "ion spri
