Manage RDP certificates on Windows using SSH
Friday, December 15, 2023 in Blog
Windows can use normal TLS certificates to authenticate RDP sessions. This gets rid of the annoying RDP certificate warnings: Using real, signed certificates for RDP offers a way to enhance security (preventing man-in-the-middle attacks) and reduce …
Reviving a dead Gigabyte MJ11-EC1 mainboard
Thursday, November 16, 2023 in Blog
Used Gigabyte MJ11-EC1 mainboards are available for low prices on ebay and at other hardware vendors. After buying a couple of MJ11-EC1 boards for a homelab cluster project, I ended up with a dead board. The server would turn on, BMC was reachable …
Dead TROTEC PAC2000S air conditioner
Wednesday, August 24, 2022 in Blog
Safety note The A/C is being powered by a ST VIPER12A switch mode supply. This type of supply is not mains-isolated, so all voltages (even the low voltages) are referenced to mains voltage. Don’t work on this device while plugged in without …
PlutoSDR standalone ADS-B FR24 feeder
Wednesday, December 01, 2021 in Blog
PlutoSDR (or ADALM-PLUTO) is an inexpensive SDR (software-defined radio) platform by Analog Devices. It uses a Xilinx Zynq Z-7010 FPGA, which integrates an 32bit ARMv7 core together with the FPGA functionality. This 32bit ARMv7 CPU runs Linux and is …
Micro8088 build log
Thursday, October 29, 2020 in Blog
Overview This is a build log of an IBM XT-compatible system called “Micro 8088”, designed by Sergey Kiselev. micro8088 CPU card specifications: NEC V20 CPU (4.77 MHz, 7.16 MHz and 9.54 MHz CPU frequencies) Faraday FE2010A chipset 640 KiB …
OpenWRT als WireGuard-Appliance
Sunday, June 21, 2020 in Blog
Language note This post was written in a hurry at the start of the Covid-19 pandemic in 2020 as a way to get people (and their offices) usable for remote work quickly. This is also the reason why it’s written in German language. Some of the …
GPS locked Raspberry Pi
Sunday, June 23, 2019 in Blog
For highly-accurate timekeeping or signal generation with a Raspberry Pi, it’s possible to replace the on-board crystal with an external reference input. On the Raspberry Pi 1 the main system oscillator is a 19.2 MHz quarz crystal. In order to …
Es'hail-2 transceiver setup
Saturday, April 27, 2019 in Blog
QO-100, also known as Es’hail-2 is a geostationary amateur radio satellite. It can be used by large parts of the world, including Europe, Africa, (parts of) South America and Asia. The satellite works as a linear transponder. It receives a …
ThinkPad PowerSeries 820
Tuesday, April 23, 2019 in Blog
One of the rarest ThinkPads is the ThinkPad PowerSeries 820, running a Power PC 603e at 100 MHz. It’s code name is Wiltwick, the type designator (used in Windows) is 6040. It uses an 800x600 TFT, WD90C24A/G10 graphics and has a 1.2 GB SCSI HDD. …
PlutoSDR clock input
Saturday, January 05, 2019 in Blog
Warning! This modification voids the warranty and can operate the transceiver outside of it’s absolute maximum ratings! The PlutoSDR has an internal XO (Rakon RXO3225M 40.000 MHz), which has excellent qualities like very low jitter. …