station there is big difference, for example with NM and WD in Hell, yesterday not a wisp from my home qth < Well, your TX signal from the "big" antenna has absolutely no problem to cross the Alps, I
Hello group, I can confirm what Alan said about the mains harmonics. The amplitude ratio between fundamental and 2750th harmonic is not easy to determine (we don't know if the generator's waveform an
Hello Marc, nice to see you back on the reflector. The Jason tests took place at 137300 Hz, frequency was chozen arbitrarily somewhere the "normal CW" and "narrow-band digimode" area. Hope to see you
Hello group, Jim M0BMU, Markus DF6NM and I had a 3-corner-mixed-mode-QSO (in Jason/CW) on Tuesday evening. Markus used his linear TX with an output power between 130 W down to 100 mW. Solid copy with
Dear all, I will transmit in Jason this evening. Time: Tuesday, April 23, starting at 17:00 UTC Frequency: 137.300 kHz Stability: +-10mHz off the frequency for worst case, because OCXO can be turned
Hi Stewart, did someone already send you some Jason samples ? If not, please let me know, I will announce some test signals on the LF reflector for tuesday or wednesday in the hope that someone else
Hi Mike, really amazing - also thought the reflector is 'down' but apparently there must be another reason :-) Little EU activity on 136kHz this weekend, the static crashes (QRN) seem to be back afte
Hello group, I made two phase plots of 1.5 hours length yesterday, the first with MSF (60kHz), the second with DCF77 (77.5kHz). To calibrate sample rate and the receiver's LO, the 15625 Hz TV sync ("
Hello Jim, Uwe and group, Yes of course an LF broadcaster can only be used as reference if he is quite close to your station. Groundwave propagation must be dominant throughout the observation period
divider , the counting process will come to a stop when the signal level falls below some threshold, so output from the divider will start and stop at points in the cycle which depend on the amplitud
Hi Stewart and group, Thanks for the suggestion. The SNR of the LORAN lines in the receiver's passband makes it difficult to track them, and as I understand it I need two of them separated by a coupl
Dear LF group, I am planning an experiment based on an idea from Alan G3NYK. The idea is to monitor the phase variation of strong signal on LF over day and nighttime. It may be interesting to find ou
Hello Szigy and group, Thanks for your info. Have you been transmitting on late saturday evening ? There was a quite weak trace on the waterfall, but I am not too sure if it was you calling someone o
So like is made in low band ( i use only 160), never the dx call and receive on same qrg, but always in split, so may be that this operation mode help us also on 137, the dx may call at 137.00, and l
Though I missed the QSO between IK5ZPV and RU6LWZ (-congrats!-), it was an impressive display on the waterfall screen on sunday and a 'very effective use of bandwidth' around 137.700, with half a doz
Hello Dick and the group, Thanks for an interesting demonstration, and also for the info provided on air. I had solid copy on PA0SE's machine-generated FELDHELL transmission, perfectly readable, but
Hello Cesare, Bill and group, From WD8ARZ: The signal was clearly received in nothern Italy. At my own QTH in northern DL, there are some occasional traces at 25 Hz but they are too weak to be identi
Hello Group, Has anyone of this group ever heard about signals in the range of 25 Hz, like this: - a few pulses of about one second length each, about 4 seconds pause between them - transmitted irreg
Hello group, An analysis of amplitude as effective voltage and phase with SpecLab produced this graph today (aplologies for embedding it in HTML format): The signal was received in USB (RX tuned to 1
