Hello Group, There was a Class E 7MHz amplifier design in QST in early 1997. It was in two parts with practical design information. Yes! You will find this article on my ftp-site... (Once more: ftp:/
Hello, I am using a 'G3YXM' PA, slightly modified from the original. Main changes are a pair of IRFP350's on each side of the push-pull (running at 56V) and an extra LC section in the LPF. With 9.2A
Dear Bernd, some om's got a problem when downloading the calculator from my website. Indeed there was a little bug inside the loop.exe-file. I corrected the software and put back a well checked new l
Hello Group, 1) I have been plotting the signal from HBG using ON5OO's excellent software, and it confirms what I had from casual observation. That is an 8-10dB enhancement when the path is in darkne
Hello Group, Observing HBG75 during the eclipse on 75 kHz I found a great effect: Plot: ftp://ftp.rz.uni-kiel.de/pub/nephro/nephlab/lp/8-11day.gif Time of maximum of eclipse (83%) here: 10:31 UTC. An
Hello Group, Recording HBG75 (75 kHz) over the whole last week I found a strong anomaly at Saturday, 14th. I observed a steep increase of field strength (9dB) followed by a smooth decrease looking li
Hello Group, Hi Mike, For those wanting to correlate solar flares with enhancements in sky-wave reception at LF, may like to look at: http://moondog.astro.louisville.edu/flares/info.html Mike, G3XDV
Hello Group, Hi Rik, Charmed by the simplicity (only 4 components) and the high efficiency of class E amplifiers I decided to do some experiments with these. Not at power levels >200Watts. So I wonde
Hello, I am most interested in any info on the Harris DX25U ... is it am AM TX, using Pulse-width modulation by any chance ? http://www.broadcast.harris.com/transmission/radio/dx25u50.pdf (observing
Hello, This weekend look out for Alfred DF2BC/P from the Campen Lighthouse. He has an excellent signal into G. He is on 136.53 with a Ropex TX. Thanks for info Dave! Excellent signal here too (579).
Hello Dick, I would like to listen to it as I have never heard how a VLF-generator sounds. There are still two audio files of the last transmission from Grimeton (Aug. 1998) on my ftp sites available
Hello Group, Hi Alan, May be that it could be of interest to have an impression how I'm working here 8-) In conclusion, I still like FFTDSP4 as an operating aid. I find that on a full scan 200-2500Hz
Hello, In the Dutch Magazine "Radio-Nieuws"of 1 April 1925 I found a treatment of the multiple tuned antenna by Ir. (later Prof.) Huijdts. It confirms what Rik, ON7YD, expected: In a multiple tuned a
Hello, Placed a graphic of my recordings of HBG75 (Aug. 07-15th) on my website. Look at: http://www.qsl.net/df3lp/projects.html (The solar flare event at Aug. 14th included) If anybody wants the data
Hi Gang, Thank you Gamal, (8) frequency 131,400 kHz station site Kiel bandwidth / modulation 600H F1B-- max power into antenna + 30.0 dBW (9) frequency 136,800 kHz station site Pinneberg bandwidth /
Hello Group, ** If possible please avoid HTML coding or system/mailer specific attachments! ** Hi Dick, Thank you for information! Will check those geometries with ELNEC for comparison soon... I used
Hello Group, Hi Dick, Question to PA0SE: Dick, did you choose 1.5mm of diameter or radius? Some programs are using "radius" other "diameter"... Here are the results from simulations with MININEC algo
Hello group, Hi Christer, I just worked SM4DHN, Lars-Bertil in Hagfors, on 136.5. Lars-Bertil uses a 400W PA and a T-antenna. Heard SM4DHN at good signal strength here near Kiel, 429 at 21:30 UTC. Ca
Hello, G3XTZ beacon audible here Sat. 07:00z at 136 kHz, approx. 10sec of dot length. Despite of its strength it is hard to read on FFT-screen due to a pulsatile LORAN-C line. Got something like IO91
Hello, [...] no Loran. So-as we say in German- I "hear the grass growing" [...] Lucky man! At North Germany the sound of "growing grass" appears as a rattling noise. Placed my "Full Scan Graphic Worm
