Do you know the time of day when there will be a break, please? I do not expect to notice it in Burgundy but would like to see if I'm wrong. 73 John F/G3PAI ** REPLY SEPARATOR **
Given that there may be a short break in LORAN transmission this coming Tuesday I thought that I would post an e-mail requesting measurement of the background noise floor, whilst the Rugby transmitte
Andy and Peter, thanks for the explanations. I didn't know the coding of the Rugby pulses. so mine was just a guess. Now everything is clear. TNX es 73 Alberto I2PHD
I'd just like to follow-up Peter's comments re use of his recently developed program to measure SNR as I am keen to get some measurements of the effect of the Rugby transmitter in order to follow-up
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.
The pulses have a width of either 100, 200 or 300us. The time/date is carried by pulse width mod :100ms = 0, 200ms = 1, with a framing code at the 52 - 59 second interval of '01111110'. Parity checks
Peter Martinez wrote: 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 car
Dear John, Stewart, LF Group, I still have some .wav file recordings of the Rugby Loran TX starting up in the mornings during their commissioning period last year, which gives a direct "before and af
Peter 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. Th
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 t
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
If you are doing measurements.... I went to a conference on time and frequency measurement last year and one comment I got from someone at NPL was that they were unsure whether the LORAN TX was impac
Dave, thanks for trying. My travelling didn't happen so I was around today after all, however, as we now know the signal didn't switch off. My thanks to Peter for developing a special piece of softwa
Hi Peter (and Dave) I dont recollect there being an "off" quite so often these days. The only have 3 of the twelve mast still up so maybe they only need 3 offs a year instead of twelve :-)) I would b
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
Sorry John, I don't know the times, but I seem to recall seeing a posting from someone on this reflector recently alluding to the "usual first Tuesday in the month" maintenance at Rugby, also known a
