Power amplifier 433Mhz

Luckyboydtt · 30th October 2008, 07:21 AM

I want to make a circuit with one transistor to amplify my signal.My input is 5dbm and I want output is 19dbm min. Anyone can help me to do it? Thanks

lineup · 30th October 2008, 01:55 PM

You have to search for special Radio Transmitter RF power transistors.

They are quite expensive.
At least for more than 1 Watt output.

There are BJT for this, but also MOSFET.

Luckyboydtt · 30th October 2008, 03:23 PM

Thanks for your advice. It is very useful for me

Nico Ras · 30th October 2008, 07:29 PM

Quote:

Originally posted by Luckyboydtt
Thanks for your advice. It is very useful for me

Go to http://www.minicircuits.com/products...iers_main.html

Nico

opcom · 3rd November 2008, 12:00 AM

http://www.st.com/stonline/stappl/pr...e=type=product$$view=table&querycriteria=RNP139=519.0

ST makes many very useful MOSFET for RF.

Luckyboydtt · 3rd November 2008, 01:50 AM

Thanks for your helps. Howerver; I am a new electronics. It is very difficult for me to make a circuit because I do not know much theory. Therefore; If you can I want you to give me an exactly circuit : including the value of its component.

dmills · 3rd November 2008, 02:24 AM

At those frequencies it is as much about board layout as it is the schematic.

For the ~100mW output you want (into what impedance, and what impedance is the source), I would look seriously at a couple of the monolithic amplifier modules and some wilkinson power combiners.

Not the way I would do if if I needed excellent spectral purity or power efficiency, but very workable if you don't need anything special.

Remember an inch of trace at these frequencies tends to look like an inductor, and if it is in the emitter connection.....

Maybe see if you can find a design for a 100mW stage for a 70cm ham band transmitter and crib that?

Regards, Dan.

Luckyboydtt · 3rd November 2008, 02:37 AM

Hi dmills. Thanks for your help. Can you send me your circuit to my email : doanthanhthinh210@yahoo.com. I think your circuit is very useful for my project. I wait your reply.
Best regards

30th October 2008, 07:21 AM	#1
Luckyboydtt diyAudio Member Join Date: Dec 2007	Power amplifier 433Mhz I want to make a circuit with one transistor to amplify my signal.My input is 5dbm and I want output is 19dbm min. Anyone can help me to do it? Thanks

30th October 2008, 01:55 PM	#2
lineup diyAudio Member Join Date: Dec 2005 Location: the north	You have to search for special Radio Transmitter RF power transistors. They are quite expensive. At least for more than 1 Watt output. There are BJT for this, but also MOSFET. __________________ lineup

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30th October 2008, 03:23 PM	#3
Luckyboydtt diyAudio Member Join Date: Dec 2007	Thanks for your advice. It is very useful for me

3rd November 2008, 12:00 AM	#5
opcom diyAudio Member Join Date: May 2008	http://www.st.com/stonline/stappl/pr...e=type=product$$view=table&querycriteria=RNP139=519.0 ST makes many very useful MOSFET for RF.

3rd November 2008, 01:50 AM	#6
Luckyboydtt diyAudio Member Join Date: Dec 2007	Thanks for your helps. Howerver; I am a new electronics. It is very difficult for me to make a circuit because I do not know much theory. Therefore; If you can I want you to give me an exactly circuit : including the value of its component.

3rd November 2008, 02:24 AM	#7
dmills diyAudio Member Join Date: Aug 2008	At those frequencies it is as much about board layout as it is the schematic. For the ~100mW output you want (into what impedance, and what impedance is the source), I would look seriously at a couple of the monolithic amplifier modules and some wilkinson power combiners. Not the way I would do if if I needed excellent spectral purity or power efficiency, but very workable if you don't need anything special. Remember an inch of trace at these frequencies tends to look like an inductor, and if it is in the emitter connection..... Maybe see if you can find a design for a 100mW stage for a 70cm ham band transmitter and crib that? Regards, Dan.

3rd November 2008, 02:37 AM	#8
Luckyboydtt diyAudio Member Join Date: Dec 2007	Hi dmills. Thanks for your help. Can you send me your circuit to my email : doanthanhthinh210@yahoo.com. I think your circuit is very useful for my project. I wait your reply. Best regards

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