The picture I included in the text did not appear in the message as it reached me. So I try it again. To Jim, Peter, LF-group, I am grateful to Jim and Peter for their interesting comments and discus
Sorry if you receive this for the second time. But I got a message from my provider that the service was temporary unavailable so don't know whether the message was send or not. To Jim, Peter, LF-gro
It seems that some computers could not open the attached diagrams in my previous e-mail.. I therefore send send them again as part of the message itself. Hope this helps. 73, Dick, PA0SE Fig.1.jpg Fi
Part of text of my previous message was missing, It should have been as follows. Dear Jim, LF Group, I also had difficulty in understanding how it works. I therefore tried to construct it in 4 steps.
Dear Jim, LF Group, I also had difficulty in understanding how it works. I therefore tried to construct it in 4 steps. They follow here and I hope they explain the idea without further text. Please r
To All from PA0SE Quite a signal! I measure its field strength as 14.2mV/m DCF39 is 1.8mV/m at my location Leiderdorp, 40kw SW of Amsterdam, locator JO22GD 73, Dick, PA0SE
Dear Dave, During daytime I'm often in the shack. I can have the receiver running so can reply when I hear your signal. Normal CW only. What will be your frequency? 73, Dick, PA0SE At 11:42 12-4-06,
To All from PA0SE The article mentioned by Kevin is titled Increased Radiating Efficiency for Short Antennas - A Tuned-Top System for Amateur Frequencies. I I happen to possess 1934 QST and I will be
Rik, ON 7YD wrote At 16:29 19-4-06, you wrote: Hi Dick, I guess you are right with "The stub functions as a transmission line to transfer the inductive reactance of the coil to the top of the radiato
To All from PA0SE, By chance I came across an interesting article in the Dutch weekly (!) magazine Radio Expres of 11 January 1934. It referred to an article in the Proceedings of the IRE of December
Hello José, I found the following results for DCF39, using the CCIR curves: Sea Water, average salinity, conductivity 5 S/m, dielectric constant 70, EMRP = 40 kW. Wet Ground, conductivity 10 mS, diel
Dear Jose, You wrote: In the web of Geri, DK8KW, can be seen that DCF39 ERP is 40KW (22KW EMRP), based on measurements made by Geri some years ago. For this radiater power corresponds, at 1800 Km, in
To All from PA0SE John wrote The control circuitry for an alternator transmitter takes into account that the drive motor needs to receive more power during key down than during key up condition. The
To All from PA0SE, A German Call Book can be consulted at http://ans.bundesnetzagentur.de/Amateurfunk/. After opening click on Rufzeichen, 73, Dick, PA0SE
To All from PA0SE A disadvantage of variometers is that although the inductance can be varied the loss resistance of the coils remains the same. That means that when adjusted near minimum inductance
Many thanks to DL1DBC, F6CWN, G3KEV, G3WCB and PA3FNY for their reports on my 137700 kHz transmission yesterday. My location is Leiderdorp, a town adjacent to the university town of Leyden, or Leiden
To All from PA0SE I received the report from DL1DBC directly. But I take the freedom to put it on the reflector just to let you know that we now have a lady in our LF-group. 73, Dick, PA0SE Date: Fri
Thanks for the reports Jeff. 73, Dick, PA0SE At 01:28 20-8-06, you wrote: 19./08/2006 2319z Good night to all, Reception of PA3FNY (above) and PA0SE (down). Curious zero beat when both stations are i
