K9AY feeder with BPF

This revision is from 2017/08/01 22:44. You can Restore it.

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K9AY design RX antenna feeder

ToDo

  • Cable wiring circuits

Quick Start Guide

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Main function

Connector description

  • There is standart RJ45 (ETHERNET) connector with shielding

  • Connector PIN description:

  • direction logic ( apply +12V for logic 1 )

Rload - checking the resistance

  • Connect Ohm meter to this position and measure value vs input Rload VTL voltage - PIN 6 on RJ45 connector

Preamp BIAS - SET/check current and voltage

  • Connect Volt-meter to GND and jumper JP1. Measure voltage ( PREAMP ON ), it should be more than 11V. ( if you want HIGHer IP3, than it could be 15V / 80mA :) )
  • DISconnect jumper JP1 and connect mA meter on the pins ( 200mA scale is fine ). Turn with R4 multi-turn trimmer and set bias to 65 - 85mA. You can have a look at my measurements: 2N5109 OIP3 vs voltage and bias