![]() There you can find extensive information about QRP operation, amateur radio and the Raspberry Pi. Installing programs under Linux is not always easy and here I recommend to check out the YouTube pages of KM4ACK and OH8STN. The PI3 is completely sufficient for the programs I use. In addition it happened from time to time that some external devices (e.g. I tested the PI4 for a while, but it gets too hot and has a much higher power consumption. I myself currently use a PI3 for this purpose. But the Raspberry PI has also proven to be very useful as a wireless computer. The use with Windows or MacOS is very easy. This is perfect for WSJT-X, FLDigi, SSTV, Packet Radio and much more. Audio, CAT (TRX control) and GPS are transmitted with only one USB cable. Due to its size, built-in battery and connectivity, it is especially well suited for portable operation and digital modes. The many possibilities of the IC-705 as a portable KW/50/144/430-Mhz multimode transceiver are impressive. The performance and functionality of a base station in one hand. October 2020 in General by Karl-Heinz Krawczyk Once done, it is a good idea to reverse the change in the swap file configuration and go back to CONF_SWAPSIZE=100.17. Now you should be able to build Fldigi successfully. nano or emacs):Ĭhange the ‘100’ to ‘1024’ and save the file:Īt this point, you can reboot to activate the new setting, or you can run these two commands to reconfigure the virtual memory configuration: I use vi to edit text files, but you can of course use any text editor you are familiar with (e.g. To do that, we need to edit the file /etc/dphys-swapfile. In this case however, we need to increase the amount of swap space available to help the compiler to compile this file. There are constant read and write operations going on, and swap space, when you run low on memory gets probably hit with the bulk of it. That is different when the card is used to run an operating system. In this mode, the number of write operations to the same location is not very large, even if you use your camera every day. Then you copy the files to your computer and then you may or may not delete these images. ![]() These cards were designed for cameras, where you take a picture and save it, then take another picture and save it – repeat 100 times. In general, when you run an operating system from a SD card, having any amount of swap space is probably a bad idea, because repeatedly writing over the same portion of memory on the SD card will wear it out eventually. A few seconds of searching on Google revealed the reason: Raspbian uses 100MB of swap space. The error message indicates that I did not have enough virtual memory. The term “virtual memory” pointed me in the right direction: In a very simplistic view, virtual memory is the sum of real memory and the size of the swap file/partion on a Unix system. Virtual memory exhausted: Cannot allocate memory Make: Entering directory '/home/pi/radio/fldigi-4.1.01/src' I never had a problem compiling versions 4.0.xx, but when I first tried to build the new version, I ended up with an error message: After getting Fldigi 4.1.01 to compile on macOS, I tried it on my Raspberry Pi running Raspbian Stretch.
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