Did you do a prototype first?
I noticed on the schematic Q1 is a MRF171A and Q1 on the pc board is ZVN3306A.
true definately some serious problems ....
1) --- that ZVN3306A is NOT a replacement for a MRF171A the MRF171A is a hi power RF transistor the ZVN3306A is a 600mW general purpose MOSFET the 2 are not interchangeable
2) --- You CANNOT use that sort of layout for hi power RF, you will end up with all sorts of oscillation problems
3) --- The MRF171A when you finally show it in the layout MUST be heatsunk its going to get VERY hot with it capable of 40W output its going to be using probably twice that ~ 80Watts from the PSU
4) --- You CANNOT use strip terminals for terminating RF input and output. You MUST use proper RF connectors like right angle SMA connectors, mounted ON the board
---- it seems there are screw terminals all over the circuit board ?? if thats what they are, they must be taken out
many of these things would be apparent to you if you looked at the PCB layout in the MRF171A datasheet You may find the datasheet a little hard to find and have to go to Motorola or as they are now known as ON semiconductor or Freescale
When building RF equip, PCB layout is critical for correct operation of the unit
You cannot have other general components close in around the power device as they will pick up radiated signal from the transistor and cause all sorts of feedback problems. the only time you will see components close into the device is when very small value chip capacitors are used to stabilise the device
You are going to nedd to have or have access to a quality RF power meter capable of the power levels you expect to measure
You are also going to need access to a spectrum analyser to tune your amplifier to make sure you are not splattering all over the spectrum with harmonics and spurii
cheers
Dave