User's Manual

IV-1
Section IV – RF Components
Amplifier Pallets
The PA25-VHF pallet is a two stage ultra linear class-A linear pallet. The PA25-VHF -L has a typical
gain of 40dB and draws no more than 3.25Adc total drain current (the exact bias and drain currents of
your system are found in the spec sheet supplied with each manual). The PA25-VHF -H (channels 7
through 13) has a typical gain of 34 dB and draws no more than 3.25A total drain current. The
quiescent and drain currents can be measured on the PA25-VHF pallet by measuring the voltage drop
across the current sense resistor found directly at the DC power supply lead input to the pallet. This
resistance is 0.01-ohms, providing a 10mV per ampere ratio.
The final amplifier stage is comprised of a P200-VHF -L or P200-VHF -H amplifier pallet and are
characterized with typical gains of 18 dB (low band) or 16 dB (high band) and maximum drain currents
of 11 A (low-band) or 14 A (high-band).
Each of the amplifier pallets is connectorized. All amplifier pallets must have the transistor drain
voltages reach at least 26Vdc before the RF drive is applied.