Hello Mike and the group, Got one decode in WSPR here, around midnight. The limiting factor was not propagation, but QRM which can be described as an "unstable buzzing / humming noise". Anyway, nice
Happy new year Jay ... your email was timestamped January(!) 1st, 2009, so I only found it by accident in the sorted list of recent mails. Joking aside, I will let WSPR run overnight. As usual, the Q
Hello Marco and group, I will be QRV on sunday morning from the club station, and look for your (and any other) signal on 136....137 kHz. Any activity appreciated; even stations worked 10 times befor
Thanks Markus. I'm at the club station now, but very noisy, and the wind getting stronger by the minute. Time to return home soon, before the snow arrives. 73, Wolf (with frozen fingers on the key, s
Hello Jeff and group, maybe someone can pass this message on to F6BWO since I don't have his email address (if he has internet access): I was in contact with Jeff this morning at DK4U, and the QRM wa
Hi Pete, Thanks for the 'forensic analysis'. I am tempted to build a high-voltage QRP transmitter from one of these beasts ;-) Sure that "DK51" is a unijunction transistor ? I found a french site (in
Hi James, Rik, Alberto and the group, Yes an impressive distance.. even though the ERP was a bit above the usual value for amateur radio on 13 cm. AMSAT-DL has applied for, and been granted, a specia
Greetings everyone, Not really LF, but QRSS... A group of radio amateurs from AMSAT-DL has successfully transmitted a (very short) message in QRSS, consisting of the two letters "HI" (im memoriam of
Hello Group, I was also watching (from DK4U) until the beacon in the neighbourhood appeared. Strangely, the QRM had the same fence-like pattern as on Harmut's screenshot. I wondered if the sideband's
Hi Nicolas, Thanks for the info and the "half QSO". I assumed something like that; no problem. Cheers, Wolf DL4YHF (just returned home from a bbq at the club station). Sorry Wolf, but some problems w
These special transformers need the magnetic bypass because a magnetron looks (as a load) like a Z diode. So they are powered, more or less, with a constant current source rather than a constant volt
Hello Andy, Of course Spectum Lab does work as a software designed radio with audio output. If you use a stereo soundcard (for I/Q input), start here (in the main menu): Quick Settings .. Image cance
fb... here similar display here, received 2009-12-12 about 21 UTC with a SDR-IQ and a small air core loop antenna (indoors): http://freenet-homepage.de/dl4yhf/vlf_rdf/latest_vlf_spectra.htm#20_to_50_
Hi Marcin, At the very moment on VLF..LF : 22.1 kHz GQD (Anthorn), strong, 23.4 kHz DHO, extremely strong (my "VLF neighbour", hi) 24.0 NAA Cutler, USA, about 40 dB weaker than DHO but very cleary vi
Hi Alberto, I occasionally see a weak trace on 40 kHz using an indoor loop antenna, but I am not convinced that this is a real 'DX' signal. The signal I see is more than 10 dB down on NAU (40.75 kHz)
Hi Stefan, Thanks for the proposals, and the boost of activity. I have passed on a few notes to the yahoo VLF group, so if you have more details about the kite antenna experiments (or even a schedule
Hi Markus and group, The extra {10} may be just SpecLab's way of displaying a linefeed. Exactly that. Each received non-printing character is simply dumped as a decimal code in curly braces. The line
Hi Rik, I prefer the SDR-IQ for VLF - it's less expensive than the Perseus, and more important, it goes down in frequency to "almost zero" (unlike Perseus, as mentioned here before). Don't get this w
