13cm PA for es'hail-2 NB-Transponder Stage-2: the 30W pcbpcb PA

Please Note this is the PCB only  
Schematic see picture 
Circuit description:
the BLF2425M9L30 works as an class-A amplifier.
An 78L05 generates a stable 5V bias voltage which is set with R10 and temperature stabilized with R11 (If you cannot get this NTC then use a 5k6 resistor).
A PTT circuit shuts down the quiescent current during RX. So if you want to test this amplifier, connect PTT to ground.
Set the quiescent current to 200mA by turning R10.
The input and output matching is made according the reference circuit, but recalculated for an FR4 material 0.6mm thick.
The loss of FR4 does not allow to get the full 30 watts specified for this transistor, but was choosen for minimum costs.
C18 and C25 are not mounted, they are for tuning, but looks to be not required.
Layout:

Building hints:
solder the SMA connectors directly, and as close as possible, to the board. It is NOT sufficiant to use a metal housing as a ground connection !
The board must be screwed directly to a cooler. Before soldering the board use fine sand paper to make the bottom of the board flat, remove all rough edges, be carefully, don't remove to much material from the ground plane, just the rough parts.
Sand paper the cooler and remove the black anodic coating. The cooler is used as a ground connection between the transistor and the board.
Screw the board to the cooler using 9 screws, use ALL of them, this is very important !
When the board is mounted, mount the transistor. DO NOT solder the transistor before all screws are fastened. Soldering the transistor is the very last action. The pads of the transistor are little bit above the PCB. Using a screw driver carefully bent the pads down to the PCB (alternatively a mounting slot can be milled into the cooler to bring the transistor down for about 0.5mm, but most people will not be able to do that, and it is not necessary).
Use thermal compound under the transistor, but only use a very small amount of paste that is almost transparent. A bigger amount of paste will isolate the ground connection !

Commissioning:
First of all: I am NOT responsible for any damage or malfunction. If you build this amplifier you should know what you are doing and you are responsible by yourself. All documents are release under the GNU public license v3 (see HERE).
1. set the potentiometer R10 to GND (to the minimum output voltage)
2. connect a power supply 24 V which is limited to 1A.
3. connect the input to a 2,4GHz source, but no input power for now. If you have no 2.4 GHz source, the simply connect a 50 ohms dummy.
4. connect the output to a 50 ohms load. If you don't have a suitable power dummy load then use 10m of RG316 cable which has (including SMA connector) about 20dB attenuation (at 2.4 GHz) and connect a low power 50 ohms load to this cable.
5. set the PTT input to TX (shortcut it to GND)
6. slowly turn the potentiometer R10 and watch the supply current. Set a current of 200mA.
7. finished. If all is done well, the amplifier is ready for use.
The PTT input should be connected to the PTT output of your transceiver.

Stacking the 10W amp and this 30W amp:
the position of the RF input and output lines are at exactly the same position on all boards. To place the 30w amp just after the 10w amp is easy, simply mount the boards one after the other and connect the 10w output with the 30w input with a solder bridge ore a small piece of wire, 


BOM: 13cm PA Stage-2, 30 watts peak
Qty Value Device Package Parts Example supplier Order Number
1 NTC0805J5K0 5kohm NTC SMD 0805 R11 Digikey
1 78L05F 78L05F SOT89 IC2 various
1 BLF2425M9L30 2,4GHz power LDMOS SOT1135A T2 Digikey BLF2425M9L30U
1 IRLML2502BPF N-channel MOSFET SOT23 Q3 various
1 250 POTENTIOMETER_SMDUNIV POTSMD_UNIV R10 Digikey SM-42TW102CT-ND
2 SMA Connectors PCB mount, right angle panel type X3, X4 Digikey J10612-ND
2 not mounted C18, C25
1 1p SMD ceramic cap NPO SMD 0603 C12 various
2 10p SMD ceramic cap NPO SMD 0603 C15, C19 various
2 15p SMD ceramic cap NPO SMD 0603 C11, C17 various
1 10u/10v SMD ceramic cap X7R/X5R SMD 0603 C14 various
2 10u/35v SMD ceramic cap X7R/X5R SMD 0805 C13, C21 various
1 1u/10v SMD ceramic cap X7R/X5R SMD 0603 C16 various
1 100 SMD resistor 0,1 watts SMD 0603 R13 various
1 10k SMD resistor 0,1 watts SMD 0603 R14 various
1 10ohm SMD resistor 0,1 watts SMD 0603 R9 various
1 270 SMD resistor 0,1 watts SMD 0603 R8 various
1 47 SMD resistor 0,1 watts SMD 0603 R7 various
1 560 SMD resistor 0,1 watts SMD 0603 R12 various
1 10u/35v SMD electrolytic cap diameter 10mm C23 various
Remarks:
The N-channel MOSFET can be any standard type in SOT23 case if the Gate-to-source Transfer Characteristics
shows a voltage below 3V. There are many alternatives like BSS138 and a lot more.
NTC: if these NTCs are not available, simply look for an NTC with 5kOhms in 0805 case
250 ohms Pot: any value between 250 ohms and 1k can be used. The PCB allows also mounting of bigger
pots as the one shown here.
C23 electrolytic cap: any value between 10uF or 100uF (>= 35v) can be used if the diameter is 10mm
smaller caps can also be installed. Even non-SMD types can be installed by bending the wires.