<?color><?param0100,0100,0100>Dear Mike, LF group,<br><br>G3XDV wrote:<br>><?/color>My understanding is that for voice transmissions NBFM and >phase mod are differently achieved but result in roughly
Dear LF Group, There seems to be some potential for BPSK modulation methods on LF, but the big difficulty is generating a TX signal with acceptable sidebands - many people find the high-power amplitu
Dear John, LF group, As well as GBR and HBG, there is also DCF77 (I think) on 77.5kHz - this has similar 1-second ticks to HBG. Note that the signal radiated by GBR around 73.25 changes at irregular
Dear LF group, If you have an RA1792 RX, and require and accurate audio frequency (for calibrating a sound card for "Wolf" reception for instance), you can get one very easily by tuning the RX to 0Hz
Dear Mal, LF group, I can be QRV on 73kHz usually at a few hours notice. I expect the same is true for other stations active on the band. Mode can be CW or QRSS or anything else you fancy. I've worke
Dear LF group, Rather good reception of GBR during an extended lunch break here, in spite of high QRN. Rugby is only about 100 miles away, so it should be! I did record .wav files of both transmissio
Dear Dick, LF group, Not too sure about linear amplifiers, but FETs are certainly better for the switching - type LF PAs that are currently popular. The reason for this is similar to those given for
Dear LF Group, I have no experience of contest operating, so I will not offer judgement as to whether I think it is a good idea or not. However, I am not convinced by the argument that the band is to
Dear Stewart, LF group, Nice to see everyone again at Wimbourne yesterday. Hope everyone had a good trip home. In response to Stewart's points, As far as I know, BPSK is good because you can use, ind
Dear LF Group, Since it seems quite a few people won't be able to make it to the LF forum, perhaps now would be a good time to ask how many will be coming? Cheers, Jim Moritz 73 de M0BMU
Dear LF group, The graphs in Terman show only a modest 3-4 dB variation in signal level over the sunspot cycle - but what they don't show is what the signal-to-noise ratio was. The high noise level o
Dear LF Group, Dick's experiments looking at V and I on a 'scope simply demonstrate that the antenna was resonant - voltage and current in phase being one way of defining resonance in an LC circuit.
Dear LF Group, Looking at a great circle map, The differences in the path to VE7SL don't seem to be that great compared to those already achieved. However, at this time of year, I guess there can onl
Dear LF Group, Thanks for the reports on the Wolf-mode signals - I hope this was useful. I put in the 3 minute bursts of carrier partly so that people who can receive the signal at relatively good st
Dear Stewart, Andy, LF group, I will sort out some recorded .wav files - this will probably take a few days, as I have to find a way of transferring the requisite megabytes from my PC at home to the
Dear LF group, I am rather busy at work at the moment with deadlines to meet and so on, but I hope to be QRV on 136k on Sunday morning for the SAQ broadcast and event station. I'm not sure if I will
Dear Martin, LF Group, Nevada have the Ropex "The First" TX listed for £189. N4ICK did a brief review of it that you can see on the AMRAD web pages at: http://www.amrad.org/projects/lf/FirstRvw.html
I wonder what did happen when those brave souls disconnected from ground the Decca mast at Puckeridge last year ?? :-) 73 Alberto I2PHD Dear Alberto, LF group, I tried this - The Decca ant downlead w
How do you know this Jim? By far field measurements? Surely there can be no computer programme clever enough to take into account all the factors you mention like leaves on trees, building proximity
