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433MHz Transmitter Range Problem

AlwinOen

Feb 26, 2023
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Hello. I have a circuit that uses a 433 MHz transceiver to transmit data remotely. The transmitter is powered by 12v and the transmitter has a 20cm long antenna. However, when I forget to attach an antenna, unfortunately the transmitter cannot be used at long range as before, possibly the transmitter is damaged. When this happens, unfortunately I have to change the circuit. because I can't find the same transmitter. I have attached pictures of the transmitter, do you think it is possible for me to fix this transmitter? Is there an item I should check or replace? Can you help me?
 

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Bluejets

Oct 5, 2014
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I forget to attach an antenna, unfortunately the transmitter cannot be used at long range as before, possibly the transmitter is damaged.
Sure is.

do you think it is possible for me to fix this transmitter?
Very doubtful. say (99.9% against)

You will more than likely find the one you show is not long range.
Just adding an antenna doesn't make it a "long range " type.
It might increase the range slightly but a long range ype has an added amp on the board and usually a different configuration.

Just use one of these, same thing.
Power and data.......

https://www.ebay.com.au/itm/144138913899
 

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AlwinOen

Feb 26, 2023
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Sure is.


Very doubtful. say (99.9% against)

You will more than likely find the one you show is not long range.
Just adding an antenna doesn't make it a "long range " type.
It might increase the range slightly but a long range ype has an added amp on the board and usually a different configuration.

Just use one of these, same thing.
Power and data.......

https://www.ebay.com.au/itm/144138913899
Thank you for your interest. I had the product you recommended, but it said that it supports 12v on a sales site, I tried to run it with 12v and it didn't work. Now when I review your product, I see that it supports 3v and 5v. Do you know, is it 3v, 5v or 12v? How many volts should I run it with?

And with the modules in the picture, I was able to receive data from a range of more than 300 meters, can I get the same range with this product?
 
Last edited:

Bluejets

Oct 5, 2014
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How many volts should I run it with?
Seems you have trouble reading the Queen's English so.......... as written in the instructions on the site I linked to.........

input voltage range: 2.2V-5V
 

Bluejets

Oct 5, 2014
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In addition, centre of co-ax (whatever it was supposed to do) connected to ground does nothing.
If Op wants something with range ability, look at using LoRa modules.
 

AlwinOen

Feb 26, 2023
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In addition, centre of co-ax (whatever it was supposed to do) connected to ground does nothing.
If Op wants something with range ability, look at using LoRa modules.
Yes, English is not my native language, so excuse me if I don't understand and I ask again..


Does it require a module with 300 meter range capability? Or can the product you send give this range?
 

Bluejets

Oct 5, 2014
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Does it require a module with 300 meter range capability? Or can the product you send give this range?
On a good day, correct voltages applied, with no rain, sun at 12 o'clock, no atmospheric noise or interference, no trees, open landscape, money in the bank, etc. etc....in other words.......... no.
Use LoRa modules.
 

AlwinOen

Feb 26, 2023
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On a good day, correct voltages applied, with no rain, sun at 12 o'clock, no atmospheric noise or interference, no trees, open landscape, money in the bank, etc. etc....in other words.......... no.
Use LoRa modules.
Got it, thanks for your interest. Have a nice day.
 

Delta Prime

Jul 29, 2020
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I hope you're not in the United States. But if you want to play with the big boys.
433MHz Amplifier 100 Watt RF Power Amplifierhttps://lcantennas.com/433mhz-amplifier-100-watt-rf-power-amplifier/

1677540350607.png
 

AlwinOen

Feb 26, 2023
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Scarcastic little nudge there......I'll remember your tag name for any future help.(not)
No, you are wrong. If I had such a thought, I would say it candidly, why would I have such an attitude towards someone who is trying to help me? I also don't understand why you think that way towards someone who wishes you a good day.
"Little nudge", I don't think so, there is no such thing.
I wish you healthy days.
 

AlwinOen

Feb 26, 2023
12
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I hope you're not in the United States. But if you want to play with the big boys.
433MHz Amplifier 100 Watt RF Power Amplifierhttps://lcantennas.com/433mhz-amplifier-100-watt-rf-power-amplifier/

View attachment 58248
Thank you for your interest.
No, I'm not in United States, that's okay. But I doubt the amplifier will fit inside the system I'm going to use size, of course there are different size ones.

I've used a different 2.4ghz amplifier for a wifi before and it was affecting all other broadcasts that were in its vicinity (433mhz, 2.4ghz wifi and 2.4ghz RC receiver).

So using an amplifier is the last thing I thought of :)
 

bidrohini

Feb 1, 2023
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I think it's more convenient to get a new pair of 433MHz RF transmitter and receiver pair. Like the FS1000A.

By the way, if you ever consider using something more advanced, you can consider nrf modules.

 

AlwinOen

Feb 26, 2023
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Feb 26, 2023
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I think it's more convenient to get a new pair of 433MHz RF transmitter and receiver pair. Like the FS1000A.

By the way, if you ever consider using something more advanced, you can consider nrf modules.

In the datasheet of the product you mentioned, it gives a range of 200 meters, but unfortunately this is not enough. I think I found out what the transistor is, I want to try again by replacing it, this is probably the faulty product.. thanks for your attention ️
 

AlwinOen

Feb 26, 2023
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The braid (screen) should be connected to ground.
Antenna cable consists of braid and inner wire. I know that the wire in the inner structure is connected to the antenna output, but I am not sure if the braid part needs to be connected to the gnd?
 

bertus

Moderator
Nov 8, 2019
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Hello,

Yes, the braid should be connected to ground.
If not connected the impedance on the output will be wrong and cause a large mismatch.
A large mismatch can overload the transmitter and cause defects.

Bertus
 

AlwinOen

Feb 26, 2023
12
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Feb 26, 2023
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Hello,

Yes, the braid should be connected to ground.
If not connected the impedance on the output will be wrong and cause a large mismatch.
A large mismatch can overload the transmitter and cause defects.

Bertus
Yes, I just checked, you're right. I tried several transistors but the problem persisted, maybe the only problem was that I didn't connect the antenna correctly. I will try as soon as possible. Thank you all so much, I learned a lot from all of you, you are all amazing!
 
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