1200w HF Linear Amplifier board MOSFET 4x VRF2933 HI Power
1200W MOSFET LINEAR HF RF POWER AMPLIFIER module. Lot looks like the one you see in the photo above - Board PA Unit. The circuit uses dual feedback system for better linearity.
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.
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 +13,8V voltage for the protection board.
The temperature control is separated for BIAS and for FANs from two thermistors. BIAS voltage are adjusted for each MOSFET separately and stabilized by, in this case, can by in range +12-15V. LED-IN, LED-FAN, indicators are on PA front panel. The amplifier module 4x VRF2933 runs of +50V and with 1200W. With +52-54V - the power increased up to 10-15%. With 45-48V the power decreased up to 5-10%. For board control, does not necessary external voltage +TX. To control output switching, just short the ground pin and pedal pin.
PA Unit schematic in a qualitative form will be included on CD. Link to video demonstrates a version PA with 4x VRF2933 =>. The power measurement was measured with following set the set video is located above. Heat sink + Copper plate + PA Unit + LPF600. Power unit + 50V RSP-1500-48.
Updated version for Solid State PA Unit DN-600 ver 2015 year. In PA Unit can be used MOSFETs: SD2933 , SD2943 , SD4933, VRF2933, VRF2944.
With using MRF150 or BLF177: up to 600-700W output power. Unlike previous versions PA Unit for DN-600 , this version have additional stabilizing BIAS integrated, increased transformers size.
Changed diagram and PCB topology. With those changes, possible to obtain up to 1400W on all bands 1,5-35MHz.
The item "1200w HF Linear Amplifier board MOSFET 4x VRF2933 HI Power" is in sale since Friday, July 14, 2017. This item is in the category "Consumer Electronics\Radio Communication\Ham, Amateur Radio\Ham Radio Amplifiers". The seller is "dnradio" and is located in Europa. This item can be shipped worldwide.
- Brand: Danuby
- MPN: Does Not Apply
- Max. Output Power: 1200W
- Frequency Band(s): HF