TEST: FX758 a cheap and light 200mW 5.8G VTX

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INTRODUCTION

Here is a new competitor in the lighweight 200mW 5.8G VTX market, the FX758. This model is a direct competitor of the Boscam TX5823 and the Flysight TX5200m. I will compare the first two models in this mini-review

OVERVIEW

In term of size, both models are similar

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With the metal casing, the weight of the FX758 is equal to 2.2g

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versus the TX5823

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or the TX5200m

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Without casing, the weight decreased to

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Pin 3 & 4 of the RTC6705 are used to select frequency band. Actually the Band “A” is selected.

Short Pin 1 as shown in blue to activate freq selection (CS) / to select band “E” (Boscam band like the TX5823)

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according to this table

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FOR ONLY BAND E + Channel select with DIP switch: pin1 to gnd

FOR ONLY BAND A + Channel select with DIP switch: pin1 to gnd + pin3 to gnd + pin 4 to gnd.

TESTING

CONCLUSIONS

Even if the output power seems a little bit less versus the TX5823, the signal is much more cleaner and robust to noise/motor interferences. With 1.5g without casing, this FX758 can be ideal for cheap and light 5.8G FPV DIY project.

PROS

+ Clean signal (as good as the TX5200m)
+ Light
+ Cheap
+ Band “A” by default (like the TX5200m, fatshark compatible)
+ Work from 3.3V up to 5V

CONS

– Not true 200mW
– Band selection requires to remove the metallic cover
– Not Band “E” by default (Boscam)
– Can’t select freq out of the box (need to short pin 1 for band E and eventually pin3&4 for band A as depicted in photo)

This VTX have been courtesy provided by Banggood in order to make a fair and not biased review. I would like to thanks them for this attitude. You can find it actually for 11 USD at FX758

3 Comments

  • Jenny says:

    Hi Seby,

    This is Jenny from FPV factory-FXT Technology(Original factory of 5.8GHz VTx module FX758).

    Thank you for your mini review on FX758,we can improve output power of FX758 to make it true 200mW and Band E by default.My skype is fxtjenny,pls add me as a contact.

    Any questions pls feel free to contact me.

    Kind regards,
    Jenny
    Skype:fxtjenny
    http://www.szfxt.com.cn
    FXT Technology Co., Ltd

  • Caleb Burke says:

    Hi Seby,

    Great test! very useful. Since this will be my first FPV build i am going to use the TX5823 because it is less hassle and Boscam is cheaper and serves me well and i know im going to be looking for that little bit of extra range. That being said, i will be using the scisky which has a filtered 5V output. Can the TX5823 be run at 5V or is that just too much power?

    Thank you

    • SeByDocKy says:

      Some TX6823 have a builtin voltage regulator supporting 5V inpout without problem but in general it will be hot. So be sure the VTX can be cooled via airflow.

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