DIY 45W SSB HF Linear Power Amplifier Amateur Radio Transceiver Shortwave Radio Development Board Kit.    Description:  For ssb, AM linear power amplifier, CW, FM power amplifier, And the most basic signal amplification expansion.  Overall gain of more than 40dB, which is 10,000 times, the input 1mW , output 10W.  Input power 1-5mW.  working voltage and current: 12-15V,6-8A.  Output power 45W (max) (this data is the first test of the data, the new data below).  Output Impedance: 50 Ohm, according to need adjustment between 10-200 Euro.  Suite size: 60 x 100mm.  Input and output interfaces: standard sma interfaces, external thread hole.  By adjusting the V303 version of the time, the high-gain put up at 28MHz output power of 25W, basically squeezed out of the tube IRF530 potential.    I personally tested the following data, this data table is a giant heat sink can withstand 200W measured above, and do not have sufficient cooling capacity of friends, please do not limit the work, so unsafe.  In 3-5MHz, due to the low frequency, low inductance, resulting in a gain of a certain loss of output power a little lower than 7MHz.    3.500MHz 54W;  7.050MHz  56W;  10.000MHz 57W;  14.270MHz 55W;  21.400MHz 41W;  24.000MHz 37W;  28.100MHz 25W;  29.600MHz 20W;    Package included:  1 x DIY 45W SSB HF Linear Power Amplifier Amateur Radio Transceiver Shortwave Radio Development Board Kit.