From Jean-Jaqcues Delcourt, ON5PG, who is working as scienticif researcher at the Belgian Royal Meteorologic Institute I received following request : My dear Rik, Have you the possibility of monitori
I have not yet decided whether to study it, visually or by radio techniques. Also if I stay at home (98.5% of totallity) or go receiving portable in the far southwest. I know that the RSGB is involve
If possible also take 'reference' measurements the day before and/or after the eclips. If the monitored signal is strong enough the special 'eclips'-program developed by the UBA software team maybe m
Charmed by the simplicity (only 4 components) and the high efficiency of class E amplifiers I decided to do some experiments with these. As background I used a very good article by Bill Cantrell, WD5
At 08:43 21/08/99 +0200, you wrote: I would like to hear if anyone have tested the Multiple Tuned Vertical in some form. I have understood that the antenna transforms the feed impedance with a factor
Only about 1 hour at the station (30 min on saterday afternoon, 30 min on sunday morning) but a lot of stations heard : DF2BC/P (559), PA0CC (569), G3AQC (529), EI0CF (329), G3YXM (579), G4GVC (549),
At 09:32 21/08/99 -0400, you wrote: Hello Chris, A mathematical (and practical) treatment of Multiple Tuning for vertical antennas can be found in: Radio Antenna Engineering by Edmund Laport McGraw H
in the mail today :-) thanks Regarding the meander-antenna : if you scale all the described antennas to 136kHz you still get 'monster-antennas'. But the fact that they manage to increase the radiatio
It happened me twice today that I replied to a mail of Nick and did send it to the reflector instead of direct. I appologize for that and promise to check the 'to' address better before sending a mai
Doing some simple maths on a the simple model of a (lossless) double tuned vertical I got this result : 1. Starting from a (lossless) single tuned vertical you get +--+ +-+ -- where L = loading coil
I just received a preliminary report from the eclipse-experiment of UBA (Belgian amateur radio society) and KMI (Belgian meteorological institute). They received a lot of reports for the 160, 80 and
I did some calculations on a more 'real-world' model of a MTV antenna, assuming that the second tuned section has its own radial system (loss resistance = R2) +--+--+ +-+ -- +-+ L' | | -- C | | L' +-
Hi Des, In his mail Geri, DK8KW, has given a very good description of what to do. I would like just to add 2 options : 1. If it is mechanically possible you might gain some dB's by placing the loadin
For those who do not have acces to antenna-software there is still the possibility to calculate the radiation resistance and the capasitance of the antenna yourself. If a simplified model is taken an
At 14:04 17/09/99 +0100, G3XDV wrote: PA0SE wrote: Refering to the last part of my second report (16.9.99 14.17) it is clear that top loads are hardly a substitute for height. Even raising the antenn
For those who are interested in the results of the UBA-KMI experiment during the solar eclipse of august 11th, the report can be downloaded at: http://www.uba.be/zon/EclRapEN.PDF (Adobe Acrobat forma
A lot of activity on this weekend. Due to a problem with the PC-monitor (fixed by now) I had to stick to normal CW. Stations heard : G4GVC (549), PA0SE (589), DJ5DI (559), G3XDV (549), PA0LEG (569),
I can confirm Mike's (G3XDV) conclusion that even a simple attenuator can improve the receiving condidtions a lot. Some months ago I took advantage of a slow-CW transmission of G3XDV (with his old VF
There's been some discussion about filters etc recently which reminded me of a question I wanted to ask the group... What receivers/tranceivers work well on LF? and possibly.. What receivers or tranc
Checked the band last night between 19.30 and 21.00 UT and heard a lot of activity (at least for during the week) : G4GVC 559 (450km) G3KEV 589 (510km) DF3LP 539 (515km) GW4ALG 539 (520km) SM4DHN 539
