RF-Amp

RF Amplifier Features

• From Charlie Morris' (ZL2CTM) Go QRP Portable SSB Rig
  • Solid State Design for the Radio Amateur?
• +22 dB gain
• Input connectors: SMA or BNC
• 49x49mm card
• 4x 4-40 mounting holes

RF Amplifier Design

DC operating point

• Ice = 10 mA
• Ve = 0.1 * Vcc = 1.2V

Input/Output Transformer

• FT37-43 toroids
  • Wideband Transformers 5 - 400 MHz
  • Power Transformers 0.5 - 30 MHz

Input Transformer

• • Input Transformer (T1 on Charlie's - T2 on this board)
    • 50:75.8 Ohms = 1 : 1.23 turns ratio
      • 9 turns primary, 11 turns on secondary

Output Transformer

• • Output transformer (T2 on Charlie's - T1 on this board)
    • 200:50 Ohms = 2:1 turns ratio
    • 10 turns primary (on transistor collector), 5 turns secondary (towards output)

Inductor Values

• Value: FT37-43 10 Turns

Schematics

LT Spice Simulation

Transformer 1.5 uH

Transformer 35 uH

Charlie Morris Schematics

• From Charlie Morris' (ZL2CTM) Go QRP Portable SSB Rig

IF AMP

Assembly Sheet

• RF Amplifier Assembly Sheet