VK5TM


News, Updates and Other Minutiae

As a lot of people have pics of things unrelated to ham radio on their websites, I thought I would add a couple of my own (Scroll down for site updates). Banjo, our Red Heeler/Koolie cross at 4 months old. Banjo at 4 months And at 12 months old (Feb 2016) enjoying his birthday breakfast treat of banana on toast. Banjo at 4 months

May 2017

New project added - my version of the X-Phase noise canceller. PCB available and a kit of parts to follow soon

27 December 2016

Another addition to the Gallery section. This time, fitting a DDS module to a Philips PM5326 RF Generator to cure a bad drift problem.

26 November 2016

Additional software for the Simple DDS VFO added. This enables the pushbutton on the encoder to change step size (step sizes 10kHz, 1kHz and 10Hz). See the notes in the Download section of the Simple DDS VFO page for more info.

20 November 2016

I have had some interesting conversations with homebrewers over the last few years relating to experiments/modifications of the works published on this website. One of the things on the 'list of things to do', was to publish some of their pics' etc on my website, so along that line, the first one, a filter/leveller for DDS modules from G3OAG, is now on my site. This one and all the others I have available to show, will be posted under the 'Gallery' menu. Now that things are starting to return to somewhat normal around here, I will endeavour to get the others up as quickly as possible (with apologies to those that have been waiting to see their work in lights).

PCB Information - Making your own

I use Sprint Layout to lay out my pcb's. Rather than mess around creating pdf's of pcb's, I will post the Sprint Layout file. There is a free viewer available to download below, which will allow you to view and print these files if you want to make your own pcb's. For the actual process of making pcb's, there is already plenty of information on the subject, on the internet, so I will not repeat it here. Everybody has their own favorite method of making pcb's. Unfortunately, the help file of the viewer is sadly lacking, so I have put some notes here to help you. The viewer does not install anything, so just put it in any folder you wish and click (or double click) the exe to start it. Once running, use the FILE menu to open the pcb file. They have an extension of LAY6. Unlike the main drawing program, the colours you see when a file opens are not changeable. Also, any ground plane area's that may be in the pcb do not show, but they WILL print. Use the PRINT SETUP option to select your printer and PRINT, obviously, to print the file. When you click PRINT, you will be presented with a page like the image below. Rather than write a whole screed on the various options available, I have labeled the pic with text so you can get the print out of your computer as quickly as possible. If your print comes out the wrong size, read the information under Calibrate Tab below. Click picture for a larger version (opens in a new page). Sprint Layout print screen You can explore the other tabs and find out what they do at your leisure.

Calibrate Tab

Some printers may need a calibration to produce printouts that are exactly true to scale. Example: A line has a length of 100 mm but the printer produces a line with a length of 101 mm. In that case enter a factor of 100 mm / 101 mm = 0.99 for correction (.990099 to be precise). The printer will then print true to scale. This correction factor will not save, you have to enter it every time you restart the program. To help with this calibration, download and open the 'Printer calibration file'. there is a cross of 100mm in each direction. Print this file and accurately measure the lengths in both directions and enter the calculated calibration numbers in the boxes. Files to download. Sprint Layout viewer This is linked directly to the suppliers download. Approx 3mb download. Printer calibration file