PA Unit module 1200W 1.5-35 MHz Linear Amplifier 4x VRF2933
Model: PA Unit 4x VRF2933. 1200W PEP typical, 1300W PEP max. FM, CW, SSB and others.
The main emphasis in the scheme - is an addition to improve reliability for PA. PA input is protected by resistor attenuator. Also, is optimizing input for input VSWR. Elements are protected circuit for if input power is too high.
Trimmer you can adjust protection drop value (configured to 20W - R10). Protection scheme is with the "sticky" status, i. Transistor key state is holding until you will connect ESC contact with the ground or OFF/ON the main +12V voltage for the protection board. The temperature control is separated for BIAS and for fans from two thermistors.Fans turns changing smoothly in dependence on temperature. In TX mode - fans is turning on full turns. For this PA - has been used three cooling fans. The fans is turned on simultaneously. Protection against an overheat is established on 50-70 degrees Celsius of heat sink (configured to 60 degrees - R75). BIAS voltage are adjusted for each MOSFET (R24, R25, R26, R27) separately and stabilized by, in this case, can by in range +12-15V. LED-IN, LED-FAN, indicators are on PA front panel. ALC negative voltage towards - trimmer R67.
The amplifier runs of +52V and with 1200W. With +53-55V - the power increased up to 10-15%.
This item can be shipped worldwide.
- Model: 4x VRF2933
- Type: Linear Amplifier
- Power: 1200 W
- Brand: Danuby