Dear Laurence, LF Group, Do you know if Hiroshi and the JA people have been able to copy DCF 39 et al? Cheers, Jim Moritz 73 de M0BMU Ive asked Hiroshi for more details and passed reflector and info
Dear Richard, With only about 40 odd NoVs in existence, and not all active, there probably are not many within 100km of you! But rather more than 100km is not unusual during daytime, so don't worry t
Dear Richard, LF Group, Not a great success. Tried a 200ft inverted L with 7m vertical section fed against 3 radials each between 50 and 100ft long. The final 100ft was very low - within 1 metre of t
Dear Richard, LF Group, It is not generally the case that the output impedance of a PA is equal to its design load impedance, and so maximum power delivered to load is not the same thing as load impe
Dear Rik, This is my theory - At 0 degrees elevation, the far-field radiation from a rectangular loop antenna is the same as that produced by 2 vertical elements of the same dimensions as the vertica
Dear Rik, LF Group, There are a couple of things I have noticed about MFSK4 receiving Graham's beacon, and in a QSO with G0NBD and M0LMH last week: The frequency has to be set accurately; a 3Hz offse
Dear Gary, LF group, Since this kind of notch filter has other useful applications too, I had a go at designing something useable from available bits. I used an IF transformer from an ancient transis
Dear Laurie, LF Group, Quartslab, who used to have an ad in RadCom, seem to have moved to Ireland, but are still offering one-off crystals - see http://www.quartslab.com/ Cheers, Jim Moritz 73 de M0B
2nd attempt... Any recommended transverter designs for LF? 73 Richard G3CWI Dear Richard, LF Group, You can see what I am using if you go to http://groups.google.com/group/uk500khz/files and download
Dear Dave, LF Group, M0BMU is now running in WSPR mode on 502.4kHz "dial frequency", 503.9kHz RF. Any reports very welcome. Cheers, Jim Moritz 73 de M0BMU
Dear LF Group, I am running a WSPR mode beacon again on 502.4kHz "dial frequency", 503.905kHz RF out. Any reports would be very welcome. Cheers, Jim Moritz 73 de M0BMU
Dear Chris, LF Group, The problem's before the mixer. As advised, I disconnected the RF stage and injected a signal into the mixer and it gives a constant output even with a blow heater playing on th
Dear Richard, LF Group, The umbrella antenna has a capacitance of about 144pF (against 129pF calculated by EZNEC) and a resistance of about 70ohms (rising to nearer 80 ohms after some rain). It was t
Dear Jim, Just audible here, about RST 229 at about 2050utc on 502.65kHz. Cheers, Jim Moritz 73 de M0BMU Dear All, G7NKS active on 503KHz at 21.20 BST/20.20 UTC sending CW @ 5wpm "CQ Test de G7NKS"
Dear LF Group, SAQ was a strong signal here as usual, with a message comemorating award of a Nobel Prize to Marconi and Braun. Plenty of QRN though. I got out the "electromechanical RX" again, as the
Dear Gerhard, LF Group, I am currently (1242utc) transmitting a DFCW beacon signal on 137.680kHz, with ERP of about 300mW. There is some QRN here, but band noise is not too bad. QTH is just north of
Dear Chris, Laurie, Richard, LF Group, Thanks for the replies. Re the comments: I agree - I don't think the wire mesh would neccessarily improve the ground losses, but compared to the radial wires it
Dear Gerhard, LF Group, Sorry you have had no luck so far - I'm sure improvements will be possible. I will leave the beacon running a little longer - I have QSY'ed to 137.690kHz so you can see how th
Dear Gus, LF Group, Just heard SM6BHZ calling CQ on 503.0kHz at around 2208utc, RST 569, so guess licence conditions have changed in SM... unfortunately, not really in a position to reply here at the
