750W Victron Solar Project – 60 Days Performance – Part 4

In part 4 I take a look at the efficiency and look at the performance over the last 60 days

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Nokia Siemens Flexi 3x90W FXEB 1800MHz base station teardown: Power amplifier (part 1 of 2)

Teardown of a Nokia Siemens Networks Flexi Multiradio base station. This have been in service as a 3 antenna system for mobile telecommunications.

GSM/EDGE, WCDMA/HSPA and LTE capable. 3×90 Watt output power.

All high resolution pictures will be published with part 2

Flexi RF Module Triple (FXxx)

The Flexi Multiradio Radio Frequency Module (FXxx) or RF Module, is a 3-branch multicarrier,multi-standard radio transceiver module. The module consists of three independent branches, capable of transmitting and receiving signals of multiple radio technologies concurrently:

    Up to 6 GSM carriers with 400 KHz minimum carrier separation
    Up to 4 WCDMA carriers with 4.6 MHz minimum carrier separation
    Multi-carrier LTE signal with 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz, and 35 MHz carrier bandwidth
    Multi RAT operation with combination of GSM, WCDMA, and LTE

The RF Modules FXDA, FXDJ, FXEA, FXCA, and FXFA/ FXFB are referred to as 70W RF Module variants. RF Modules FXEB and FXDB are referred to as 90 W RF Module variants. Each branch consists of a transmitter and two receiver chains. FXxA and FXFB (70W) variants have front end software tunable filters (STuF). 90 W RF Module variants have fixed full band filters. FXxx is a 3U high module with an integrated, replaceable 3-fan assembly for module cooling. The supported functions are:

    Chaining up to three RF Modules with OBSAI RP3_01
    2-way receive diversity in the receiver chains
    Integrated antenna line supervision
    MHA, Antenna Hopping, EGPRS2, and VAMOS support
    Digital and control circuitry, optical interface, DC/DC power conversion, and other necessary functionalities
    Integrated DC line OVP, Class II rated to 5kA pulse (FXFB, FXDB/FXEB)
    Remote Electrical Tilt (RET) support (FXFB, FXDB/FXEB)

Flexi Multiradio BTS GSM/EDGE modules are equipped with an integrated air guide plate providing full thermal compliance without casings. This allows installation of the modules without casings in Flexi cabinets and enclosed 19″ racks. Casings and covers are recommended in standalone 19″ racks (no cabinet) for safety reasons. Casings are not part of the FXxx delivery package. If the configuration requires casings, Flexi BTS Module Casing (EMHA) kits must be ordered.

The Flexi Multiradio RF Module variants are:
Version    Description
FXDA     GSM 900 (E-GSM) 70W
FXDJ     GSM 900 J-Band (P-GSM for CDMA co-siting) 70W
FXEA     GSM 1800 70W
FXCA     GSM 850 70W
FXFA/FXFB GSM 1900 70W
FXDB     GSM 900 (E-GSM) 90W
FXEB     GSM 1800 90W

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How To Make a Stencil For Spray Paint With Cheap Hand Tools

How to make a stencil template out of metal sheet, reusable and very sturdy. Can be used for spray or brushed on paint. No power tools, only cheap hand tools, a laser printer and clothes iron.

I highly recommend using a stencil font with sharp edges, as it makes it much easier to cut. You can find a wide variety of fonts for free: https://www.google.com/search?q=stencil+font&newwindow=1&source=lnms&tbm=isch&sa=X

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ESAB Power TIG 200 Welder Teardown

A teardown of a ESAB Power TIG LTR200 welder, a run down of the current paths in the system and I show which parts I kept.

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IBM ThinkPad A20p, from 2000. Vintage Computer Teardown.

Standard Features

  • Intel Mobile Pentium III 700 or 750 MHz CPU
  • ATI Rage Mobility 128 with 16MB
  • 15.0″ TFT display with 1400×1050 resolution
  • 128MB PC-100 memory standard (512MB max)
  • 18 or 20GB HDD
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Teardown of Danfoss VLT6000 4kW Variable Frequency Drive

A teardown of a Danfoss VLT6000 4kW VFD, a run down of the current paths in the system and I show which parts I find to have a value.

Datasheet on the unit: https://www.danfoss.com/en/products/ac-drives/dds/vlt-and-vacon-legacy-drives/vlt-6000/#tab-overview

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Floppiclene! A Electronics Cleaning Relic of the Past.

I found a old 3.5″ floppy drive cleaning kit and tried it out on a defective computer/floppy drive/floppy that I had. It would constantly ruin “new” disks and leave them with few kb of useful space.

It also failed horribly!

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Siemens Polyphos 30, X-RAY Inverter and Control Panel Teardown (Part 3 of 3)

Teardown of the Siemens Polyphos 30 X-ray systems control panel including computer, safety functions, HMI and high voltage inverter circuit.

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Siemens Polyphos 30, X-RAY Collimator and Image Plate Teardown (Part 2 of 3)

Teardown of the Siemens Polyphos 30 collimator and image plate. Collimator had an interesting moving blinds design with a lot of gears, pulleys and strings. Image plate has a lead grid and some kind of sensor.

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Siemens Polyphos 30, X-RAY 125kV head teardown (part 1 of 3)

Teardown of the Siemens Polyphos 30 X-ray head which contains step-up transformers, voltage multipliers and a rotating plate x-ray tube and a lot of oil!

Discussion of teardown and additional pictures: https://highvoltageforum.net/index.php?topic=523.0

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