Hi all, A reminder that ZL6QH will be starting beacon tests in several hours time, including all hours of local darkness. Local time is 0536 UTC for ZL6QH sunset and 1912 UTC for ZL6QH sunrise. Dual
ZL6QH 137.7888 kHz BEACON TEST ON 17 AUGUST ZL6QH will be carrying out beacon tests on Saturday 17 August, starting before ZL6QH sunset and going till after ZL6QH sunrise. Hours of local darkness for
Alberto, An excerpt from your message: In my opinion it contained an error, as it used the same formula involving AL, both with ferrite toroids and iron-powder toroids. Amidon gives two different for
Hi all, Plans are for ZL6QH to run a 137 kHz beacon transmission overnight on 17 August. More details will be posted nearer to the time. A further beacon test is planned for 21 September. 73, Bob ZL2
Hi all, I have reviewed a series of Argo captures, for 137.7000 kHz, earlier this morning. There is a suggestion of a QRSS signal before local sunrise, but it is too indistinct to claim anything. 73,
Steve, I'm struggling with a poor set of options for an aerial at this house. The greatest vertical section I can get while still allowing top loading is 8-9m, but the lower 3-4m would be up against
Hi all, Confirming that ZL6QH radiated a beacon signal all night, and that timing was good, with each "Q" starting within 12 seconds of the hour. 73, bob ZL2CA
ZL6QH 137.7888 kHz BEACON TEST ON 21 SEPTEMBER ZL6QH will be carrying out beacon tests on 21 September, starting before local sunset and going all night, till after local sunrise. Hours of local dark
Rik, You have a novel idea. There could be problems of transients with the "synchronous switch" needed to make and break during each RF cycle. Most antennas work in "steady state mode" where the ener
Hi all, Alberto commented: IMHO, the main reason for the more pleasant sound is the IF filter...supposing the '60s receiver uses a crystal filter, while the Hallicrafters not. Crystal filters are won
Bill, My experience with many shapes of top hats is that it DOES reduce the radiation measured in the far field. The theoretical explanation I have seen is that the effective height is reduced due to
Steve, I'd arrived at. Does the current really taper away to zero at the open ends or is that effect swamped by ground capacitance when it's only 0.5% of a wavelength above ground? The RF current at
Martyn, Advice from Mike is similar to what I would advise. Expanding on one point: possible in the antenna is beneficial. It will resonate with lower inductance and therefore lower resistive losses.
Hi all, Plans are for ZL6QH to carry out 137 kHz beacon tests for three nights in a row in late December. Selected dates are Friday 27, Saturday 28 and Sunday 29. More details will be posted nearer t
Jan-Martin, Jim and others, I also agree with comments that a series inductor (the traditional "loading coil") is the best approach for compensating capacitive reactance in amateur top-loaded vertica
Mike G3XDV, It would be useful to know how the US/Canadian reception related to sunrise and sunset times at either end. As a general comment, it seems that pre-dawn enhancement happens on many LF DX
Hi all, The ZL6QH beacon transmission went without missing a beat on each of the last three nights. A DDS exciter was used for the last two nights, and it maintained very good timing of a Q ID starti
Hi all, ZL6QH will be on again tonight, using the DDS exciter. The frequency shift is 0.424 Hz, dot length 120 seconds. Transmitted frequencies are (rounded to 0.1 Hz): hi = 137.7891 kHz lo = 137.788
Mal, ZL6QH went on transmitting well into daylight this morning. Our sunrise was nominally 1650 UTC. Do you have a screen capture of what you received? If so please email to me as an attachment. Chee
