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Old Jul 10, 2015, 02:27 PM
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Mini-Review
FX758 200mW VTX (vs the TX5823) (Under construction)



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




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



versus the TX5823



or the TX5200m



Without casing, the weight decreased to



Pin 3 & 4 of the RTC6705 are used to select frequency band. Actually the Band "A" is selected.
Short pin1 to activate freq selection, select band "E" (Boscam band like the TX5823)






according to this table




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.



For example, for the band E, jump like shown in blue






TESTING

200mW 5.8G VTX: FX758 vs TX5823 (Courtesy Banggood) (19 min 59 sec)


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 projects.


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
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Last edited by SeByDocKy; Sep 24, 2015 at 03:24 AM.
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Old Jul 15, 2015, 10:22 AM
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Seby, I wasn't quite sure from your pic where to jump. Your diagram just kind of points to what looks like a cap but I cant tell which end I should jump to. Please let me know if this is correct, thanks.
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Old Jul 15, 2015, 10:55 AM
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Quote:
Originally Posted by LumpyLouis View Post
Seby, I wasn't quite sure from your pic where to jump. Your diagram just kind of points to what looks like a cap but I cant tell which end I should jump to. Please let me know if this is correct, thanks.
I see more like this

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Old Jul 15, 2015, 11:02 AM
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the a band frequencies are 5mhz higher than fatshark frequencies. how well does that work?
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Old Jul 15, 2015, 11:24 AM
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[QUOTE=SeByDocKy;32161048]I see more like this


Ah, OK I see now, thank you for the clarification youre the best.
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Old Jul 16, 2015, 11:52 AM
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So its not 32 channel and you have to dissasemble to get to the band points

Bit of a waste, think I will stick with the standard 8channels
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Old Jul 16, 2015, 01:14 PM
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So its not 32 channel and you have to dissasemble to get to the band points

Bit of a waste, think I will stick with the standard 8channels
Yes it's a good choice ... now almost everyone got a 32CH VRX
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Old Jul 20, 2015, 06:02 PM
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To remove the metallic case you need hot air or just a soldering station? Is the metallic case soldered in 2 points? Is it hard to remove?

3.3-5v so it works with 1s lipo? And with lower voltage you get less mW output? Thank you!
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Old Jul 21, 2015, 08:59 AM
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Originally Posted by matrixFLYER View Post
To remove the metallic case you need hot air or just a soldering station? Is the metallic case soldered in 2 points? Is it hard to remove?

3.3-5v so it works with 1s lipo? And with lower voltage you get less mW output? Thank you!
yes I removed with my normal iron. Little by little. Only two points. It's not hard but not too easy. Just a little of patience.

Yes it work with a 1S. I will publish a DIY step by step building of a cheap and lightweight 200mW 5.8G kit with this VTX. Yes the less input voltage, the less power you will emit
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Old Jul 22, 2015, 11:34 AM
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Originally Posted by SeByDocKy View Post
yes I removed with my normal iron. Little by little. Only two points. It's not hard but not too easy. Just a little of patience.

Yes it work with a 1S. I will publish a DIY step by step building of a cheap and lightweight 200mW 5.8G kit with this VTX. Yes the less input voltage, the less power you will emit
That's a great idea, thanks Seby, people are charging/paying way too much for micro 5.8 setups when they can diy their own for so cheap.

Does this get as hot as the TX5823? My TX5823 gets seriously hot even on 3.7V. I received my FX758 but I haven't tested it yet.
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Old Jul 22, 2015, 12:07 PM
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Quote:
Originally Posted by LumpyLouis View Post
That's a great idea, thanks Seby, people are charging/paying way too much for micro 5.8 setups when they can diy their own for so cheap.

Does this get as hot as the TX5823? My TX5823 gets seriously hot even on 3.7V. I received my FX758 but I haven't tested it yet.

I published the builtlog/tutorial here: http://www.drone-maniac.com/diy-chea...nd-cl-antenna/
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Old Jul 28, 2015, 09:15 AM
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So I pulled the shield off yesterday... OMG, there is no way I will be able to bridge that microscopic cap! Its a fraction of a millimeter between each one. I am very comfortable with a soldering iron but this is a job for Ant Man.
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Old Jul 29, 2015, 03:52 AM
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Quote:
Originally Posted by LumpyLouis View Post
So I pulled the shield off yesterday... OMG, there is no way I will be able to bridge that microscopic cap! Its a fraction of a millimeter between each one. I am very comfortable with a soldering iron but this is a job for Ant Man.
Yes it's pretty hard.... need a very thin tip and x20 magnifyer I think
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Old Jul 31, 2015, 07:07 PM
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Sorry noob question : doesn't the shield act as a cooler ?
Is it OK then to remove it permanently for flight? What would be the pro and cons?
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Old Aug 01, 2015, 02:56 PM
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Sorry noob question : doesn't the shield act as a cooler ?
Is it OK then to remove it permanently for flight? What would be the pro and cons?
It's acting more as a Faraday's cage .... to limit RF external interences but as you can see in my demo video, the signal is really clear without....
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