Dear LF Group, Was able to copy G3YXM's test signal last night - somewhat surprisingly using a 300MHz IBM laptop. Copy was perfect, with random letters appearing only when Dave was not transmitting -
Dear Alberto, Steve, Dave, LF group, Thanks for producing this new mode - should be interesting to see what happens. A few thoughts cross my mind: The fastest computer I have is 300MHz, so whether th
Dear LF Group, Since it seemed the mystery carrier on 136.647kHz might be somewhere near Watford, only about 10 miles from my QTH, I went out on Sunday morning armed with a loop antenna and RX, a com
At 13:54 11/01/2002 +0000, you wrote: Apparent direction of sig on 136647 from here is 352/172 deg True. If Jim's 235 degs from Hertford is correct then it's located in Watford! But I don't trust it
Dear LF Group, I noticed the signal from Rugby on 73.25kHz had gone QRT last night; This morning it was back on again, but transmitting an unmodulated carrier. If it stays like this for a while, it c
At 12:45 09/01/2002 +0000, you wrote: Interesting that there appears to be no sign of the callsign ident..... Dear Andy, LF Group, I wouldn't be too surprised - even in 50Hz audio bandwidth, the sign
Dear LF group, A number of people expressed an interest in my reception of G4JNT's PSK beacon, so here is 1/2 hour from the spectrogram from Monday night, hopefully edited down to a reasonable size f
At 16:54 08/01/2002 +0000, you wrote: The 4 inv L's are spaced at 90 degrees from each other around the tower. 73 de Mal/G3KEV Dear Mal, So what holds up the other ends of the 4 inv L's? Must be quit
Dear LF Group, Another one worth mentioning is G3LDO and OH1TN's 73/136k QSO, which is probably the record LF/LF cross band QSO. Cheers, Jim Moritz 73 de M0BMU
Dear LF Group, Got G4JNT's PSK signal sequence again, quite straightforward once I had figured out it was 30 bits long. The spectrogram method is definitely easier than the oscilloscope phase compari
Dear LF Group, Some reasons for the current band-plan: The "Transatlantic" windows at the top and bottom of the band are there for good reasons- the bottom of the band is better for the North America
Dear Andy, LF Group, I copied the G4JNT PSK beacon last night; assuming I have the start times/polarity correct the sequence was: 011 010 111 001 011 I found two methods of demodulating the signal us
Dear LF Group, I seem to be the only station so far that has had some success with both WOLF BPSK and 7FSK modes over transatlantic paths, so here is my comparison: W!TAG was able to get perfect copy
'73 , Valerio Dear Valerio, Between about 2000 and 2300, your QRG cycled up and down between about 135.921 +0.09Hz and +0.13Hz - I reckon my measurement error will be within 0.01Hz. The drift seemed
Dear LF Group, Have returned to work this morning after the Christmas break, and have now waded through most of the 400 or so e-mails that had accumulated. I'm sure I have accidentally deleted a few,
Dear LF Group, A lot of the variations on symbols for units seem to be due to computers; for instance, most CAD and simulation software can't do Greek letters and is not case-sensitive. The Pspice si
Dear LF Group, Claudio wrote: Now in my receiver I use 4 tuned circuits, with strong high frequency attenuation (46 dB at 200 kHz and 80 dB from 500 kHz to up). This configuration attenuate MW broadc
Dear LF Group, I had the usual crop of bouncing e-mails, but I hope I have now sent the vectorscope circuit to all who have requested it. Thanks to G3YXM for putting it on his web pages - so hopefull
Dear LF Group, I drew a skeleton schematic diagram of the vectorscope circuit for an oscilloscope X/Y display that I tried last week. It is too big for the reflector (about 50k), but if anybody would
Dear Markus, Wolf, LF Group, Thanks to all the stations listening to the PSK08 test last night, and for all the reports received. DF6NM and myself were able to have a QSO lasting about half an hour w
