HF Amplifier LDMOS BLF578

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First time build in 25th Aug 2018.

Progress the cage in 25th Aug 2018.

Progress in 27th Nov 2018.
  
Complete the cage on external front and rear panel.

Progress in 30th Nov 2018.

Finish on internal cage.

Amp meter added. 

Progress in 2nd Dec 2018.

Work on PCB of TX and RX switch .

Etching PCB.

Etching done completely.

PCB for voltage in with 2 relays.

 
Progress in 3rd Nov 2019.

  Work continued on internal parts.

.....and internal wiring.

Progress in 4th Nov 2019, testing. The critical thing is the trimpot bias should be adjusted to get an IDQ  at 1.7 to 2.0 amps for BLF 578. Other LDMOS such as BLF188XR 1 amp is suggested according to data sheet.

First time launching use in Oceania SSB DX Contest 6th Oct 2019, High Power All Band Single Operator 500W based on license permitted as an Advanced.

 
During the test, input by RTTY with 10db attenuation into the amplifier using an Icom 718.
The display is showing the watt before attenuator.

Output.

Power supply being used is Switching Power Supply GPE4860C 53dcv 60A, prefer to use this power supply because its fan is very quite.










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