as promised I give you an overview on the progress for building a low cost PA for es'hail-2 NB transponder.
We have the prototype finished and tested. It is running fine.
The total cost of material of the amplifier is about 20 Eur only.
The performance data are:
output power is 5 watts
with 100mW input (nice fit to the Amsat TX mixer board)
output power is 10 watts
with 200mW at the input.
You can read more detailed information here:
since this prototype works so well, we will continue with a second version including a PTT circiut and a few other parts. But we keep it simple so everybody can build it easily.
If more gain is required (i.e. for SDR transmitter), simply two of these boards can be chained, giving a total gain of up to 34 dB. I have used two boards in series for the power tests because my generator has only 10mW max output.
All parts are available worldwide from digikey or mouser.
I have 4 PCBs left, if anyone wants to build it, just write me a forum-message.
The part list, circuit and gerber data will be published on above web pages during the next days.
Last month i tested two PA without sucess ( Counterfeit parts and re tuning 2100 mhz LDMOS) . I will try to buy MHT1008N for test.