Posts by PY1SAN

Quote from dj0abr

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:

at 12V/850mA

output power is 5 watts

with 100mW input (nice fit to the Amsat TX mixer board)

at 24V/680mA

output power is 10 watts
with 200mW at the input.

You can read more detailed information here:

English:

https://www.helitron.de/dj0abr…sh/technik/sat/sat_pa.htm

German:

https://www.helitron.de/dj0abr/german/technik/sat/sat_pa.htm

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.

vy 73
Kurt, DJ0ABR

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Congratulations Kurt.

Last month i tested two PA without sucess ( Counterfeit parts and re tuning 2100 mhz LDMOS) . I will try to buy MHT1008N for test.

73 !

PY1SAN

Sandro

Other comment.

My arduino is 5v. The ADF4351 is 3v3.

I used some resistors the pins Clock, Le and Data.

PY1SAN

73 !

Quote from DL1ARS

PY1SAN

Do you have the code for the Arduino Nano for me?

DL1ARS .

I used the code below:

ADF4351

After, I determined only one frequency ( my LO is 1127 MHz) and removed the LCD.

PY1SAN

73 !

I use ADF4351 + arduino uno. I adapted a MMIC ( Minicircuit) to amplified the LO signal in the same board.

Quote from i2NDT

the EP-AB003 you suggested might be OK.

I use the EP-AB003 in my setup.

I use a California Amplifier MMDS downconverter.

Quote from DL5RDI

PY1SAN :

Nice duoband-solution. The RX seems to work very well.

Did you test the Helix feed (of course NOT in direction to 26E ;-)) ) - is there interference of the TX-signal on 2,4 GHZ with the reception of the LNB ? What about the loss in gain because of the helix-feed is "to close" to the dish and not really in the focus ?

Any information and data would be appreciated.

73 de Johannes, DL5RDI

P.s. thanks to Heiner for posting the Youtube-Video !!

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@DL5RDI

Thanks for your comment. Probably i will test TX this week (with dish other direction). I don't have some basics equipments to measurement 2400mhz. However i also believe that i will have an big desense or saturate my LNB.

I will test with 5 watts.

73 !

PY1SAN

GG77 Resende

Rio de Janeiro.

Some tests in GG77 Resende - Rio de Janeiro.

120cm dish + LNB Avenger PLL 321 + RTL.

PY1SAN

73 !