Author Topic: Nokia Siemens Flexi 3x90W FXEB 1800MHz base station teardown  (Read 172 times)

Offline Mads Barnkob

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Nokia Siemens Flexi 3x90W FXEB 1800MHz base station teardown
« on: September 05, 2019, 08:30:24 PM »
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. 3x90 Watt output power.

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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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Offline ElectroXa

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Re: Nokia Siemens Flexi 3x90W FXEB 1800MHz base station teardown
« Reply #1 on: September 05, 2019, 09:34:41 PM »
interesting !  :)
I love the way RF electronics are constructed and trying to understand how it works
Thanks for the video

Did you save any RF components ?


Offline Mads Barnkob

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Re: Nokia Siemens Flexi 3x90W FXEB 1800MHz base station teardown
« Reply #2 on: September 05, 2019, 09:50:32 PM »
interesting !  :)
I love the way RF electronics are constructed and trying to understand how it works
Thanks for the video

Did you save any RF components ?

Your most welcome :)

I saved the small BNC wires you saw me remove, some connectors and 6 power amplifier boards.
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline Cherenkov11

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Re: Nokia Siemens Flexi 3x90W FXEB 1800MHz base station teardown
« Reply #3 on: September 06, 2019, 04:24:30 PM »
Wow!  :)

Just a questions, where do you get all of that RF equipment? Is it part of your job? Are they defective, or just out of service?

Regards

Offline Mads Barnkob

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Re: Nokia Siemens Flexi 3x90W FXEB 1800MHz base station teardown
« Reply #4 on: September 09, 2019, 09:56:37 AM »
Wow!  :)

Just a questions, where do you get all of that RF equipment? Is it part of your job? Are they defective, or just out of service?

Regards

I find it as scrap metal, it is sold off for its large quantity of aluminium and gold plated electronics. It is not a part of my job and I am pretty sure they are just taken down due to upgrades. Even though these LTE (4G) capable amplifiers could be used for 4G instead of the 3G they were running, its not a viable option as they need to combine their amplifier outputs for 4G, so a single amplifier can no longer run a 3 zone antenna, so its cheaper to just throw them out and buy a new 4G/5G amplifier that can work with 3 zones.
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

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Re: Nokia Siemens Flexi 3x90W FXEB 1800MHz base station teardown
« Reply #4 on: September 09, 2019, 09:56:37 AM »

 


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