Yesterday I conducted the first successful resistive load test of a 3 phase 13 A Lübcke variac stack. It has been been enhanced with safety and monitoring options. Read all about the construction and see all the pictures and video demonstration here.
Finished Project: 3 Phase 13A Lübcke Variac Read More »
Seven users entered the lottery for a board by leaving a comment with a email address. Through a gentleman agreement, they also subscribed to the various channels related to this site. Two random numbers have been drawn between 1 and 7 using random.org The two lucky winners are schiro marc and David! Thank you very much to all
Winners of a DRSSTC UD2.1 Board Read More »
I got two spare DRSSTC driver boards and you now have the chance to one of them home. It is a Steve Ward UD2.1 board as you see in the picture, with free shipping. All you have to do is one or all of the following things: Like my facebook page this is where you get
Win a DRSSTC UD2.1 board for just a like/subscribe Read More »
Nokia Siemens Networks Flexi Multiradio BTS is a GSM/EDGE, WCDMA/(I-)HSPA, and LTE base station. Used in mobile telecommunication antenna networks. A network that you use daily on your cellphone. Part 1: System station and Part 2: Power amplifier Phased Antenna Array This is an obsolete Kathrein XPol 2-port single band panel antenna. The 2 ports means that
Nokia Siemens Networks Flexi WCDMA Teardown: Antenna (part 3 of 3) Read More »
Nokia Siemens Networks Flexi Multiradio BTS is a GSM/EDGE, WCDMA/(I-)HSPA, and LTE base station for use in mobile telecommunication antenna networks. A network that you use daily on your cellphone. Part 1: System station and Part 3: Antenna The following 12 minute video shows the teardown step by step with explanations, high resolution pictures of
Nokia Siemens Networks Flexi WCDMA Teardown: Power Amplifier (Part 2 of 3) Read More »
Nokia Siemens Networks Flexi Multiradio BTS is a GSM/EDGE, WCDMA/(I-)HSPA, and LTE base station for use in mobile telecommunication antenna networks. A network that you use daily on your cellphone. Part 2: Power amplifier and Part 3: Antenna In the above picture we see the first DSP board that was visible when the first shield was taken
Nokia Siemens Networks Flexi WCDMA Teardown: System Station (Part 1 of 3) Read More »
The Ericsson RBS 2216 is a 900 MHz GSM base station that would have been installed at the base of a antenna somewhere out in the field of mobile telecommunication networks. The enclosure contains one BFU-31 battery fuse and relay unit, three PSU-AC 27.2 VDC 1520 Watt power supplies, one DXU-31 central processing unit and
Ericsson RBS 2216 900 MHz base station teardown Read More »
I had the opportunity to take apart a GSM 900 MHZ power amplifier and band pass filter. Here I will show you how it is built and explain a little about the various mechanisms inside the filter.
GSM 900 MHz power amplifier teardown Read More »