Preamp module with 2N5109 OK2ZAW

This is very simply preamplifier module with 2N5109 transistor based on W7IUV design. You can use it as high IP preamplifier, buffer amplifier or small driver. Gain is up to 18dB and there is also build in variable ATT. You can easy set gain as high as you need! As well you can set right transistor bias with multi turn potentiometer. Two relays offer bypass switching if there is no power supply.

Main functions:

• Info:
  • Broadband: 0.1 MHz to 60 MHz
  • Very high IP3
  • Good gain up to 18 dB
  • High output power up to 26 dBm
  • Variable ATT for gain 0 to 18dB
  • Bypass relays
• You can set transistor bias as you need by trimmer
• High quality relays with TWO contact parallel
• Designed for SMA connectors
• PCB size 50x50 mm
• Available as
  • ASSEMBLED and tested
  • KIT : all parts + PCB
  • PCB only

Parameters:

• Info:
  • Supply voltage 12 - 14 V
  • Supply current up to 180 mA include relays!
  • Gain: up to 18 dB
  • REAL IP3 37 dBm for 18 V / 90 mA more here

Use:

• High IP RX preamplifier - RX antennas
• Buffer amplifier
• Driver amplifier

Versions:

• ASSEMBLED and tested
• KIT: PCB + rest parts with transistor and radiator
• PCB only

The measured values

Gain 50 kHz to 1 MHz

Gain 1 MHz to 70 MHz

Input SWR, S11

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Preamp module with 2N5109
Schematic and board pic	sch	brd
We believe open source is a better way of doing things. View and download the Shield Schematic and PCB files. The hardware designs are released under the Attribution-NonCommercial 2.0 Generic