Hello Joe, Contrary to the Subject, propagation was worse last night. Yes, the beauty of LF propagation is that not a single night is the same as the previous one. It should be rather boring if it wa
Hello Joe, I use NAVTEX 490 and 518 kHz to study propagation. It is not fool proof due to co-channel interference, but it has its own surprises. Amazingly, this service is still extended. E.g. India
Hello Paul, I have been monitoring Canadian NDB's for years now and my findings are that the best propagation in Summer always happens in July. I have heard quite a few in Summer that I have never he
Hello Joe, Good copy for the better part ogf the night. 73, Roelof, pa0rdt The following section of this message contains a file attachment prepared for transmission using the Internet MIME message f
Hello Joe, Propagation was just a tad down, but static increased quite a bit. 73, Roelof, pa0rdt The following section of this message contains a file attachment prepared for transmission using the I
Hello Joe, T/A propagation is a little weaker. Sea attachment. Early in the evening yesterday, I received a full blown NAVTEX message on 518 kHz from Penang, Malaysia, 10.000+ km away. This station h
Hello all, The first scheduled transmission of SAQ today has been received very well here. There are still 2 more transmissions today: starting 10:15 UTC with a messagae at 10:45 UTC and 12:15 / 12:4
Hello Joe, The design is slightly different. I use now 2 J310's parallel and Rs = 560 ohm. Supply voltage can be anything between 4 and 20 V, whilst the current draw is 7 mA. The output transformer i
Hello Paul, Noise received on your TX antenna is re-transmitted and this is responsible for the increase in noise level on your RX antenna. One way to get rid of it is to detune your TX antenna on re
Hello Marco, The J310 is a sturdy device. In a strong RF field the gate starts to conduct and the gate voltage does not rise any higher. The device protects itself so to speak. Due to the small size
Hello Paul, I just saw your details. The transformer ratio is way to large. Try 10:1 and see how this works. At LF your antenna is still an E-field probe, though it does not look like one. I once use
Hello Paul, For your information, today I have tested a ´low noise vertical´. This is a 50 mm diameter and 3.30 meter long aluminium pole. The capacitance is 47 pf. Using a transformer of 80 turns pr
Hello Paul, There is no need to mount a mini-whip very high. 5 meter is about optimum. Higher will give stronger signals and noise, so nothing is gained. Don't worry about the screening effect of tre
Paul, For your interest, I believe you live at about the same latitude as Sydney, Nova Scotia. There is an NDB on 263 kHz, which makes it all year round here. At the moment the grey line is very wide
Hello Paul, You're welcome. Looking at the time of reception, this is a typical pre-dawn enhancement. I will monitor WSPR 136 kHz for the time being starting 22:00 UTC. Testing yet another low power
Hello Andy, I have used a RTL-SDR.Com V3 dongle running in direct sampling mode under SDR#. You should be aware that it lacks sensitivity at LF and is prone to overload from Medium Wave broadcast sta
Hello Albert, The last few weeks I have received decodes from NAVTEX Malaysia and Shanghai on 518 khz. Reception in Finland has been far better, though. As you live a few hundred kilometers north fro
Mike, Don´t underestimate the power of propagation. NDB´s from Canada and also MW broadcast stations have been much stronger than I have seen for years. Also the number of decodes of Canadian DGPS st
