Hi all, Thanks for private and reflector reports. It looks like reception in North America was very good at times. I'm working through confirmations from John W1TAG, Dex W4DEX, Mike KB6WFC and Mitch
Hi all, Regarding the forthcoming tests from ZL6QH, I have had private email regarding the earlier bulletin suggesting making skeds for two-way contacts using Jason if propagation on the first (ZL) n
Hi all, ZL6QH will be sending LF beacon transmissions overnight (New Zealand time) on 27, 28 and 29 December. Transmission will start about 0720 UTC (ZL6QH sunset is nominally 0752 UTC) and end about
Hi all, Here is a Christmas question: Do you know what Santa's little helpers are called? Answer: Subordinate clauses. Have a Merry Christmas, Bob ZL2CA
Dick PA0SE, It was not until recently that I found out about the extent of "mixer control" placement(s) in a sound card. There are analogue and digital mixers. The MIC-IN, LINE-IN and CD-IN have inpu
Jim and others, I also find that external effects affect the depth of null you get - in my field strength measuring experiments, I found some locations where there was almost no null - This seemed to
Peter G3LDO, I am still plugging away at trying to find the cause of the cyclic variation of my antenna current on 72kHz You could need a consultation from H. Hertz ;-) 73, Bob ZL2CA
Jan_Martin LA8AK, Wonder if somebody has any experience in building mains filters for the PC ? An alternative approach is to insert a mains isolating transformer at the PC (and also watch out for "by
Hi all, ZL6QH is planning LF beacon transmissions for 27, 28 and 29 December. This is the weekend between Christmas and New Year (also summer holiday time downunder :-) Sunset at ZL6QH is nominally 0
Alan G3NYK, OK on the notch filter design, but for a high impedance load. I have often wanted to try a notch filter in a low impedance feeder, for such purposes as reducing a TV line oscillator harmo
Jim and others, Thanks for getting the numbers straightened out. I've been hasty with email recently due to "not enough minutes in the day". The mains harmonic situation is that "very high" frequency
Hi all, I made a numerical mistake in my last posting. 25 Hz shift at 136 kHz is a ratio of about 0.009, or 0.9%. Of course, we would like the "QRM deviation" of 50 Hz lines to be much less than plus
Hi Jim, Alberto, Rik and others, I agree that the frequency stability of the mains network is a point to consider further. However, I think there are two interference mechanisms at play in the LF ban
Hi all, I originally thought that 137.7000 kHz was clear of QRM in this corner of the world, however lots of capture time on trying to find a UA9OC signal (with success on 13 March) found a weak QRM
Hi all, Some time back I had a lot of difficulty with "clouds" forming when Argo was set to dot lengths over 30 seconds. I has Windows 95 as an operating system. I tried changes to sound cards, to no
Hi all, Our experience at ZL6QH over the last two nights has lead us to consider that 60 second dot length is about right for long haul QSO attempts, as when propagation lifts even shorter dot length
Hi all, Still no luck for ZL6QH. At one stage we got very good copy of the latter part of an "NN" which assume came from UA9OC, but as they could not copy us, and we had no confirmed identification o
Mike, We saw things like that while receiving on 137.7000 kHz at Quartz Hill. They were "strong quick dits" and we were at a loss to know how they arose. 73, Bob ZL6QH good be Little seen here, eithe
Hi all, Confirming that ZL6QH intends to beacon on 137.7000 kHz with DFCW, plus and minus 0.2 Hz shift, from before ZL sunset till 1218 UTC on Saturday. We will be sending QQQQQ. At 1230 we will try
