Microwave Forum

R_F · Rod & Todd Flanders Messages: 6

Hi again,
Experimented with the PA yesterday and I have some discouraging info.
I tested the 900MHz part of the PBL 403 05 and I added -3V to the VNEG.
At the output I had 50 ohm smd resistor.

The circuit got so hot and the dummy didn’t get hot at all…(low output power)

I added antenna and I was not impressed at all.
-SHIT!
The PCB looks ok (no error) so there must be something else.
Maybe matching must be accurate or the PCB…don’t know…

The current consumption was high and I don’t think I will on with this circuit more.
If anyone else who is serious wants to experiment, I will send you circuits.

So how to proceed with a PA?

Well I think I don’t need so much output power to jam, since the vco itself works as jammer.

How about building a simple PA with transistor ?
It works good in cordless phones at 914MHz and 959MHz.

I think I will go on experimenting with that.
Again, all tip and ideas are welcome.

Regard
D.

richy_64 · Administrator Messages: 198

Hi,
don´t give up. In my eyes your PA chip is just great... sooner or later it will work.

Would you try something for me?
Try Vneg= -5V and remove the input signal to the pa or disable the vco.

Does the PA still get hot?

duanepoland · registered user Messages: 2

In the modern times, cell phones have become an essential part of our life. You will be out of fashion if you have no cell phone. One hand, you can send massages and make phones to your friends or your colleagues with phones at any time in any places. On the other hand, we will enjoy our life with it, such as listening to music, playing games, taking photos, recording a vedio, suffering the internet, etc. But more and more people are using cell phones at the expense of public interest. They talk aloud over the cell phones, the endless ringtones sounded everywhere. How to cope with the noises of cell phones in public has drawn public attentions in many places of the world. Do we have to force ourselves to listen to the noise generated by cell phones? Of course not, phone jammer is a useful tool for us to deal with the noise pollution.I have bought one for my convenient life, so if you have the same problem with me, you can come to get one. You will find the cool of it.