Yesterday i held the talk about the VNWA a second time. This time for a local electronics community. Therefore i updated the slides a bit. Please view in fullscreen mode. Here they are. (In german language only !)
Monthly Archives: April 2010
DUR Contest April 2010
This was my first DUR activity this year. I found time to participate from Hirtstein/JO60OM. DL2LCE and DL8WQQ were there as well and operated some hundred meters away. This was the first time i tried my FT-817 together with the transverter and a new LNA stage as well. Surprisingly heard no beacons before the contest started. But a test with DG0VOG showed that all things were working properly, puuh. Unfortunately there were complaints about my signal by DL2LCE which i have to follow up now. So i did not call CQ on my own and just worked stations. In the end i had 18QSO and around 1200km in sum.
BTW. the small panel antenna is for 5GHz WLAN as it can be used for Hamnet.
DUR Apr10, JO60OM
Yet another DCF77 decoder for AVR Atmega
already some months ago i wrote another dcf77 decoder for Atmega AVR controller. It uses oversampling of the signal (not edge trigger)
and worked quite stable for my opinion. It is possible to switch on some debugging and the dcf77 signal synchronizes a simple clock.
Find the C sourcecode attached… Have fun.
dcf77decoder_10
AX25 with OpenWRT backfire 10.03
Today i tried OpenWRT backfire 10.03 with AX25. Last versions i had hard problems getting ax25 compiled for brcm47xx and also problems with the floting point emulation inside the kernel. First made usage of the native linux ax25 tools impossible and last prevented usage of the popular ax25 router software xnet (which is unfortunately closed source). Either one or the other worked.
Today first the AX25 stuff was not build as well when i selected kmod-ax25 inside “make menuconfig”. But after i selected the ax25 kernel support inside “make kernel_menuconfig” suddenly the kmod-ax25 module was build. That happened never before ;) I also switched on kernel FPU emulation which is off per default. And what should i say. Also XNET worked after i flashed all the stuff to the router. So OpenWRT backfire should be an excellent point to start AX25 operation with.
digital amateur radio in saxony
I created a new yahoo group for communication about digital amateur radio topics in our local area. E.g. planning link-tests.
DVMODEM Yahoo Group
There is a new yahoo group (in german language) that is about the digital voice modem (DVMODEM) for the Siemens C5. This modem was created by DO1FJN, Jan.