Dear Larry, LF Group, Getting the "wrong frequency right", and being able to identify the dot length with reasonable accuracy is a pretty tall order to be just a coincidence - so I think that must ha
Dear LF Group, I monitored 137.79kHz +/-5Hz last night - there were signals there allright, but exactly what they were is another matter. Amongst other things, there were 2 continuous traces spaced b
Dear Mike, LF Group, It seems to me that with the range for detecting aircraft quoted, you will need to shout very loudly indeed to be heard in Boulogne! I seem to recall a BBC program some years ago
Dear LF Group, Last night, I transmitted 3s dots at the agreed intervals on 135.916kHz, from 2115 until 0630. On receive, the noise level was about 10 - 15dB higher than the previous night due to the
Dear LF Group, Transmitted on 136.916kHz at the agreed 1/2 hour intervals from 2015 until 0630 last night, sending M0BMU four times each interval. This is a log of what I saw on 136.5kHz; The times a
Dear LF Group, The antennas at Rugby and Criggion have had some modification over the years - the original designs both used 8 wire "sausages" slung between the masts for the top load. Now both have
Dear LF Group, Alan makes reference to the loading coils at the 16kHz VLF station at Rugby; A while ago I got hold of a couple of old papers detailing the original construction of the VLF stations at
Dear John, Jack, LF Group, OK, so I will send my callsign using 3s dots, starting at 15 and 45 minutes past the hour, for about 15 mins. Assuming I can see your signal, I will wait for you to call me
Dear LF group, OK on the loading coils - my current loading coil is over 500mm diameter, so ready-made containers to fit it are hard to come by. I'm suprised that people have had success with coils e
Dear Dave, LF Group, Sorry to hear about G3YXM's slight overheating problem. This type of thing is certainly a hazard with LF - I expect most people have their tales to tell. It is one reason why I d
Dear LF Group, I hope to be QRV on 73kHz tonight, from about 2000 utc onwards - if I hear no other stations on 73k, I will try listening on the top end of 136kHz for cross-band contacts. TX frequenci
Dear LF group, If you have a receiver and signal source which can be tuned to 198kHz or one of the other stable broadcast frequencies, you can compare the frequencies with parts-per-billion resolutio
Dear LF Group, Regarding frequency stability - for a long time for QRSS I used simple VFOs, both for transmit, and in my homebrew RX. It was easy to achieve TX stability within a few Hz using the VFO
Dear LF Group, A happy new year to all - I have been without E-mail facilities over Christmas, so have just spent a couple of hours reading through the 260 or so e-mails that had accumulated - mostly
Dear LF group, Re- antenna loss resistance: A basic difficulty with direct impedance measurement of an LF antenna is that the loss resistance is much smaller than the magnitude of the reactance. For
Dear LF Group, First, the measurements on G3XDV's antenna - The SNR in a 25Hz measuring bandwidth and 9.3km distance was probably about 50dB, so noise was not really an issue. I checked the calibrati
Dear Stewart, LF Group, smaller antenna had a higher field strength than you expected. Yes it did, but only by about 1.5dB as I recall - this would be within the limits of experimental error. The thi
Dear LF Group Congratulations to Laurie & Larry on their QSO - for those in the Antipodes wanting to participate in G to VK and ZL tests, perhaps now would be a good time to switch on the spectrogram
The following section of this message contains a file attachment prepared for transmission using the Internet MIME message format. If you are using Pegasus Mail, or any another MIME-compliant system,
