From G3PLX: At the moment (10:30) Lessay is transmitting with it's 9th pulse mostly off except that it's pulsing "RE" in morse. Rugby is transmitting with it's first two pulses mostly off, but they r
From G3PLX: It wasn't Rugby that went off yesterday but Lessay. As luck would have it I was trying to debug some LORAN receive software that morning, and I couldn't figure out why it wouldn't work. I
From G3PLX: My contact at Lancaster University tells me that the Aurora alert this afternoon was caused by an equipment malfunction. No aurora is expected. I was watching the phase of LORAN lines on
From G3PLX: I seem to remember a story of a farmer near the BBC Droitwich transmitter who was lighting his farm buildings with RF from the 198kHz transmitter, and the BBC took him to court for steali
From Peter G3PLX: Now Soustons (SW France) has gone off also (0710z). Only Rugby and Sylt are still transmitting in the 6731 chain. Sylt is also transmitting at the 7499 GRI so listeners in Germany w
From Peter G3PLX: My last posting, with the above subject, addressed to Scott, was sent to this reflector in error. My apologies for any inconvenience or embarressment. 73 Peter
From G3PLX: John: Surely with a callsign like that you should be getting on the air well below 136kHz, to be precise below 30kHz? 73 Peter Having just received my French call sign, it therefore seems
John: Yes, Lessay is off air as I type this, at 06:50. The other transmitters in the chain are blinking their first two pulses periodically, which is their way of saying that the chain is unusable. 7
Scott: Further to my last re the PhaseScope instructions, I think the instructions relating to the PPS polarity might be faulty. If the PPS is inverted by the soundcard, the program will think the ne
From G3PLX: Just a couple of words about the PhaseScope program that Scott VE7TIL has written, and the ClickLock technique at the heart of it. Some of this repeats earlier postings, but I thought it
Victor: It may be important that when you send postings to [email protected], that you send the message "from" the exact same email address at which you receive the list postings. Some ref
Walter: Surely the problem you describe, of interference between HBG and LORAN, was the result of the (clean) HBG signal on 75kHz getting into the (too-wide) passband of the airborne LORAN receivers.
From G3PLX: When Rugby LORAN failed to shut down last Tuesday, it occured to me that I could adapt my coherent locking program to measure the LORAN SNR even while LORAN was transmitting. I measured -
Alberto: Yes, I think you are right. Most of the pulses are 100mS duration, and the spectrum of a 10% duty cycle pulse does have a missing 10th (20th, 30th..) harmonic. Some of the pulses are 200mS.
Stuart: The design of an MSF receiver, intended to recover the carrier frequency to any great accuracy, needs to be able to reject the existing 'unwanted' signals either side of the carrier. These ar
From G3PLX: I don't think the presence of the spurious emission (near 60kHz) from the LORAN transmitter would cause any trouble to MSF itself. A quick calculation says that the nearest spurii from th
From Peter G3PLX: No, I didn't see it go off either. The first Tuesday in the month is documented as the Rugby maintenance period, but perhaps the grass didn't need cutting this month because the wea
From G3PLX: Dave asks how close do you have to be to see anything that isn't exactly on frequency. The answer is 'it depends'. The integrating vectorscope idea will produce a straight line if the sig
From G3PLX: I initially used this antenna with a single vertical wire and the coil grounded to the base of the tower ground system. I think this is what you described above. There was some discussion
