PA Unit 900-1300W Linear Amplifier 4x SD2933, SD2943, VRF2933, MRF150

  

In PA Unit can be used: SD2933, SD2943, SD4933, VRF2933, MRF150. With up to 1300W PEP output power. With using MRF150 or BLF177: up to 600W output power. Unlike previus 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 1500W on all bands 1,8-30MHz. KIT contains almost all components for production of PA Unit. All SMD components are soldered. KIT is delivered as it looks on a photo above. 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 runs of +50V. With +52-55V - 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. A detailed diagram of the PA unit will be included on the CD in parcel. The power measurement was mesured with following set (the set photo is located up). Heat sink + PA Unit 4x VRF2933 + LPF600. Power unit + 50V RSP-1500-48. The item "PA Unit 900-1300W Linear Amplifier 4x SD2933, SD2943, VRF2933, MRF150" is in sale since Sunday, October 4, 2020. 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.