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VK5DJ's Amateur Radio Site |
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Links
Antenna Repeater
project Contest logger Weather Stations Beam
indicator Email |
The purpose of this site is to make available some amateur software and describe a number of projects, including a repeater controller, a beam indicator system, and an adapter to convert weather station data to APRS format. My interest in amateur radio was kindled by friends while I was still at High School in 1956. We built modulated oscillators and super regen receivers and operated on the 1 metre band. I gained my first licence, VK5ZBF in 1957 and almost immediately my full call VK5DJ in January, 1958. It was probably the interest cultivated on the 1 metre band that led to a lot of my operating on VHF. Complemented by an interest in computer programming, this interest in VHF resulted in the four projects available from this page. Click here for a nostalgic photo from 1956 of Doug (now VK3UM), Brian (now VK3BCZ) and John (still VK5DJ) push bike mobile on 288MHz. YAGI CALCULATOR The first is the yagi antenna program and is a Delphi based follow up to my 1991 yagi program written in Borland Pascal. Many successful antennas have been built using it. With a move away from DOS to the Windows environment it became clear it needed an update. I also took the opportunity to update a couple of the algorithms. The new version is again based on the work of DL6WU. It is used to calculate the dimensions of long yagi antennas (2 or more wavelengths) for VHF and UHF. Dimensions, Gain, Stacking Distance, and Matching are covered. A simple SWR calculator is included. The help file covers some of the issues involved in yagi construction. The program works in all screen definitions. (Latest version 2.3.3 on 4 December 2007.) VK5DJ REPEATER CONTROLLER The controller is the subject of an article in Amateur Radio Magazine October 2004. Since the article was submitted in 2003, the controller has some important improvements. The use of a 16F628 or 16F648 is now 'standard'. Support for the 16F84 is no longer provided. The 16F628 and 16F648A have more memory and permit more options. Currently the code fits into a 16F628 (2K) but in future the 16F648A (4K) may be required as options are increased. Click here to access the VK5DJ controller page. Repeaters have been a real interest for me and I have been instrumental in the building of VK5RMN in the Mid North, VK5RPM (digipeater near Millicent), VK5RMG the Mt Gambier 2M Repeater, VK5ROH the Mt Gambier 70cm repeater and gateway, VK5RKN (Kingston) and VK5RBT (Bordertown) gateways. The Kingston, Bordertown, Naracoorte and Mt Gambier Repeaters are linked. The homebrew board in this photo is now operational at Willalooka near Bordertown for their gateway into the south east repeater system.
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Australian RD Contest RD log for 2007 Since 2006 I have made a couple of small fixes and created a different method of entering your details for the log printout/CSV for the contest manager to comply with his recommended layout. Version 6.12 on 10/8/07 fixed a problem with the 'Clear' button when used after a 'Cannot work own area' message. A loop bug with the error message. Fixed. It was usable before but this makes it nicer. Version 6.10 Fixed finding help file, added a calendar and ensured the ZIP function was included. (A file was missing in the last package). The new version is available now for download. Check for updates closer to the RD contest in case a problem is found. Download the "RD setup.exe" file from the links section and run the program to install RD logger. Note I had omitted the ZIPDLL file from the June package so ZIPPING would not have worked. The July package is complete. Do not install the latest version to the old (2006) directory, just let the installer do its thing and install in 'RD Contest Logger 2007'. A file was changed that could cause a program crash if you put it in the 2006 directory. A problem with resizing on the new widescreen portables is largely fixed (it's hard to deal with all the widescreen combinations of late). It may also have overcome a display problem on some other machines. Don't forget to clear out all the old logs before starting the RD using the item in the file menu. If you experimented with Zipping or generating the CSV files for the contest manager you should go to the CSV directory and clean out all the files there. Old fixes for RD Added a global name change in 5.06 to ensure every occurrence of a logged call has the name updated if editted (see "Names" in help file). Also simplified the name of the ZIP file and stopped zero length files being added to the ZIP. Version 5.07 re-arranged the entry boxes to make it a bit more logical and fixed a problem with the enter key moving around the entry boxes. Fixed an error in the number received checking process in 5.09. Feedback is valued, send it to
me at I will continue to add niceties as I think of them. A shortcut is placed on the desktop and in Programs. When the program is first run you will be invited to insert your callsign. The program will then generate two log files. One for HF and one for VHF. Up to 3 callsigns may be included providing a total of 6 logs. SWR Weather station adapter I've been working on a program to convert the data from a WM918 weather station to packet radio format. There is currently at least one other solution available but I wanted more flexibility than that offered. I wanted a 'connected' mode as well as an option for position and positionless data. See here for details Beam position indicator The Beam Indicator page has a discussion regarding accuracy and downloads of diagrams for the whole project (thanks Russell VK3ZQB for drawing up my messy drafts) and an update on the masthead circuit. An extensive menu system manages the options in the shack unit while switches on the antenna unit offer several options. There are options for internal (shack unit), manual or external computer control. I've developed a system that allows for different encoders including a screw jack option, gray code encoders etc. Tests over a 100m of Cat 5 cable from antenna to shack have been successful. Read the project description for further details on the beam indicator page. South East Radio Group Last updated 18 April 2008 |
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I know, it's a bit kitsch but I like it, and it's my page!