Ericsson Surplus Pa

As always this hobby requires a bit of luck from time to time.

My luck at the 23cm band came when I came across a surplus 900MHz PA board. Thank you Per! The board consists of 2 stages, one 200W and one 300W stage. These stages can work toghether when needed.

The original board. To the left the 200W with SRF 8S9200HS.

/23cmorgboard.jpg

 

 

After some cutting the board is free.

/23cm-200wboard.jpg

 

 

Now some tuning and testing. Many thanks to Per SM0DFP for your assistance.

/23cm200w-testing.jpg

After reaching 150W I decided that it is enough. 200W is possible to achieve. However my measuring equipment is not that accurate to decide 0.5 to 1 db increase. Better to be safe than sorry.

 

Inside: Dual 28V PSU constant 5A now working at 29V. Coaxial relay from ACE, modified to work at 12V.

/23pa3.jpg

 

 

The backside: Nothing fancy....

/23pa2.jpg

 

 

And the front view:

/23pa4.jpg

/23pa1.jpg

 

Now I have more than 6 db gain from my former status....

 

 

 

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