DJ 5 HG
My name is
Klaus Boje von der Heide.
Klaus
and
Boje
are first names and
von der Heide
is the family name.
I explicitely say that because I gathered a large and funny collection of letters naming me Mrs. Dr. Heide von der Klaus or simply Sehr geehrter Herr Dr. von, .
Some Personal Data
Born in 1941. Radio Amateur License since 1959.
I studied Physics, Mathematics and Astronomy at the University Hamburg.
Current Position
Professor of Computer Science at the University Hamburg
in the Department Technical Computer Science
Teaching Area
Basic Courses in Computer Science,
Advanced Courses in Computer Architecture, Digital Signal Processing, Chip Design.
Some Course Material is based on MATLAB and is available on request (look at Download).
Scientific Area
Computer Architecture, Digital Signal Processing, Fault Tolerance
Personal Interests
Digital Communication in Amateur Radio, Coding Theory and the whole world of nature.
Pactor1/2 is my favorite mode on HF,
CW, SSB, FSK441 and JT65B on VHF. But mostly I am simulating new modes on
the computer. So DJ5HG is rare on the bands.
Download
Compiled Matlab Programs (Freeware)
Nearly all these programs (and many more, that possibly will be compiled later) were used by me for years. I always start them from inside the Matlab environment, not using any graphical user interface. In 2004, The Mathworks presented an entirely new concept of a Compiler for Matlab. Using this compiler, I can deploy programs that I originally made for my personal use. But the compiled programs cannot be started within the Matlab environment, they only use an encrypted version of Matlab (the Matlab Component Runtime). To be useful, I had to program graphical user interfaces for these programs. These GUIs are not tested in all possible situations. Also, there might be problems due to specific hardware on platforms. I will collect reports and, as far as there is time, try to remove problems. Although I'm not the youngest, I am fully engaged in my job at the university. So please be patient. Also, a positive report on a lucky running program might be helpful while I am getting buried by error messages.
To run these Programs you have to download and install the Matlab Component Runtime on your computer. Sorry, this is nearly 100 MB. Then download the zipped program folders you want and inflate them into appropriate directories. Now the programs can be started by a double click on the *.exe in your file browser or generate an icon.
The programs are for WinXP. They do not run on older Windows, and probably, will not run on newer ones.
Most of the programs soon will also be available for Linux, MacOSX, and Solaris:
- The Matlab Component Runtime (84 MB; an installation is required for the following programs).
- A very easy-to-use single button audio recorder for ham-radio use (50 kB). This was a funny all-in-all two-hours job of programming. You will never loose a record by accidental overwriting. You push the button to record and push again to stop and save the record under the ISO 8601 string of date and time as the file name.
- A program that tries to enhance CW signals recorded as WAVE-files (1.5 MB). This program uses two subprograms, one for coherent CW-decoding (with carrier synchronization), and one using an adaptive matched input filter and incoherent AM-decoding, lowpass-filtering and AM again on a carrier of 666 Hz. This is nice for aurora. This program also includes the simulation of weak normal CW and aurora signals, and two audio examples.
- A program that shows possible reflection areas for aurora/FAI and meteor scatter, and the antenna direction. Output examples are in DUBUS 4/2004 p.41/44/45/46 and in CQ DL 1-2005, p.18/19, Bild 2/3. The program does work all over the world, but sorry, the coastline maps and city locations are missing outside Europe / Africa. Surely, someone could add this.
- A program that shows the area that can be contacted via aurora/FAI for a given reflection point. Output examples are in DUBUS 4/2004 p.40 Fig.3/4 and in CQ DL 1-2005, p.19, Bild 4/5. The program does work all over the world, but sorry, the coastline maps and city locations are missing outside Europe / Africa. Surely, someone could add this.
- A program for the design of high-performance linear-phase digital multirate filters (170 kB). A multirate filter is a series of individual digital filters that are computed at different sampling rates. The program generates the filter coefficients of all individual filters. These filters are charcterized by linear phase and high computational efficiency.
- A monitor program for WSJT that enables you to do your work in the garden or elsewhere while calling CQ (74 kB). It is this program that enabled me to enjoy both, the sunny beach of the Baltic Sea, and 87 meteor scatter QSOs at my 2004-holiday in KO27ej. It calls you when your callsign was decoded by WSJT or if one of up to eight predefined patterns (your most wanted prefixes for ex.: " ZA" or " 9H1") occur.
- A program that generates a 3-D-image of the earth globe that can interactively be zoomed and rotated by the mouse. You can add magnetic fieldlines wherever you want. These field lines are computed based on the International Geomagnetic Reference Field (IGRF) at a date in the interval 1900 ... now.
- A program that generates a map with coast lines and locator grid and markers at all locators present in your ASCII log file. This program is intended to draw the results of VHF-work or higher. The search for worked locators can be restricted to those lines in the log file that contain additional entries like "2004" and "CW" or "2005-01-04". If you search for "Alex" you will get a map of locators of operators worked whos name or city starts with "Alex" or a comment contains that string.
- A program that shows rotatable 3-D-images of the duct model for the Trans Equatorial Propagation (TEP) in the years 1950 ... 2010. The author does not prefer this model more than others. The program simply is a tool for analysis and prediction of possible contacts.
- A program that demostrates the effect of polarization rotation by geometry and by the Faraday effect in EME contacts.
The programs are OpenSource. If you have a Matlab license, and want to learn from the programs, or want to improve them, then let me know.
Go to the DJ5HG Download Page
Articles
Useful Meteorscatter Data
Some FSK441 Meteor Scatter WAVE-files
- I4XCC (141 kB ZIP of I4XCC_020103_151701.WAV)
- Overcrowded 144.370 MHz with MANY different stations (144 kB ZIP of MANY_020103_152201.WAV)
- RU1AA (141 kB ZIP of RU1AA_020103_175001.WAV)
- UA3ARC, RW3PF and RX1AS calling CQ (214 kB ZIP of cq_from_russia_040504_062300.wav)
Amateur Radio Station:
144 MHz antenna: 2 x 3 x 7 element FLEXA turned by hand within 2 seconds to any direction in azimuth and elevation
144 MHz receiver: 0.5 dB preamp, IC-706, DSP, laptop
144 MHz transmitter: laptop, IC-821, PA 600 W
432 MHz: IC-821 20 W + 13 Element Yagi
1270 MHz: IC-706 + Transverter 12 W + 1 m dish
2400 MHz: Converter to 432 MHz IC-821 + 1 m dish
Postal Adresses:
| Location of DJ5HG | Klaus von der Heide |
| JO53cl | Sichter 1
D - 21029 Hamburg |
| Location of DJ5HG (VHF and Satellite) | Klaus von der Heide |
| JO53im | Seestr. 128
D - 21514 Güster |
| University | Prof. Dr. Klaus von der Heide |
| Universität Hamburg
- Informatik -
Vogt-Kölln-Str. 30
D - 22527 Hamburg |
e-mail:
| For HAM-related messages: | dj5hg@qsl.net |
| For private communication: | v.d.heide@on-line.de
|
| For University-related messages: | heide@informatik.uni-hamburg.de
|