Hello Richard, Luis, all, a horizontal dipole at low height (versus wavelength) is in theory an inefficient antenna. See http://www.strobbe.eu/on7yd/136ant/#HorDipole. But: 1. "Low height" is less th
Hello Marcus, " I recently missed the JT9 activity night, mostly due to the lack of a linear MF transmitter" I assume that with "linear MF transmitter" you mean a transverter from HF to 472kHz But ju
Hi Stefan, all, around 476.18 kHz (let's say 476.1-476.3 kHz) seems very convenient for QRSS, for the reasons you already mentioned. I thought this was already the de facto QRSS band segment. 73, Rik
certainly false, the given locator (QF89) is some 100 km off the east Australian coast (close to Lord Howe Island, VK9L) 73, Rik ON7YD - OR7T Van: [email protected] [owner-rsgb_lf_gr
Hello Andy, the advantage of a push-pull class B amplifier is that it it pretty linear at higher power levels. 73, Rik ON7YD - OR7T Van: [email protected] [[email protected].
A single stage class B amplifies the signal over 180 degrees (ie. half the sine). As long as the amplifier is not saturated the amplitude at the output is almost linear proportional to the input ampl
Hi, Wolf, Tom, Dave, good signals from all of you, with Tom being the strongest one (S9++). But 1200W RF explains a lot ;-) Wolf was a stable S9 and Dave on average S7 (down to S3 and peaking S9). I
Hi Roelof, Marcus, with a bit of luck this is just an appetizer of what we can expect the coming years when we are going toward the solar minimum. In 2009-2010 winter I could hear Joe (VX9MCR at that
Hi Stefan all, I had 9 TA copies last night, 8 from WG2XJM and one from WG2XKA. I just checked the TX periods of WG2XJM and between 04:18 and 05:58 UTC I only missed one ! There was however a 42 minu
I just noticed very strange TA propagation on MF last night: During a very short period (04:40 - 05:02) 3 US stations were copied in southern Germany, but nowhere else in Europe: 2016-03-07 04:40 WH2
Hi Stefan, all, to get the facts right: there were many other EU's "listening" at that time (> 30), but any one (you) at less than 500 km from the JN68 group. So it's not sure how focussed the propag
Hello Alan, thanks for your reply. I was just wondering if (and how) the strange propagation was correlated to the solar events. Although the WSPR SNR values have to be interpreted the sharp eak at 0
The fun might still be going on tonight, have a look at this impressive VK-JA series: 2016-03-07 19:12 VK3ELV 0.475785 -28 1 QF33bq 5 JH3XCU PM95sm 8016 354 2016-03-07 19:06 VK3ELV 0.475786 -22 0 QF3
Hello Vincent, good idea, if WX is not too bad I will participate. As for the frequencies I would suggest to keep JT9-1 and WSQ2 a bit separated, because of the larger WSQ2 bandwidth. What about JT9-
Just a thought: what if I could set up a local WSPR station (let's say at 10 km from my QTH) that transmit 100% of the time with very low power (so it is centrainly not overloading my RX). I would ex
Hello all, some days ago I came across the website of Andre, ZS1JEN, and learned that 472-479 kHz is "released" in ZS. Andre is very interested in 472 kHz (and 136 kHz) and did set up a (temporay) WS
Hi Stefan, that might do the job, but I'm not sure of the combination "very expensive lovely designer lamp" and "aluminium foil" ;-) 73, Rik ON7YD ________________________________________ Van: owner-
Hello Stefan, yes, after reading his blog I did contact Andre. As said he is very interested. I suggested to start with a miniwhip antenna and he is building it right now. If the local QRM is not too
