User's Manual

IV-1
Section IV – RF Components
Amplifier Pallets
The VHFTV-25 pallet is a two stage ultra linear class-A linear pallet. The VHFTV-25-L has a typical
gain of 40dB and the VHFTV-25-H has a typical gain of 34dB. These pallets draw no more than
3.0Adc total drain current (the exact bias and drain currents of your system are found in the spec
sheet supplied with each manual). The quiescent and drain currents can be measured on the VHF TV-
25 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.
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.