K5TRA

USB-Radio Interface for Allstar

DESIGN DETAILS

1T.Apel

RMG Meeting August 13, 2016

K5TRA

Assembled Board

2T.Apel

K5TRA

Features

3

T.Apel

• USB sound card chip

• Left or Right channel jumper on 3-pin header

• Third order active audio filter

• Buffered COS and PL input lines

• COS and PL invert jumpers on 3-pin headers

• GPIO outputs

• LED status indictors

• Fused power line

• Small size: 2.5” x 1.8”

K5TRA

Schematic

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K5TRA

LPF Schematic

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K5TRA

LPF Response

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K5TRA

Board Layout

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K5TRA

Board Top Layer

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K5TRA

Board Top View

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K5TRA

Board Bottom Layer

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K5TRA

Board Back View

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K5TRA

Board Pads

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K5TRA

900 MHz Simplex Node

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K5TRA

Summary

14T.Apel

• A small, low cost, USB radio interface for Allstar

• Audio, COS, and PL jumpers on 3-pin header

• Filtered audio eliminated high frequency digital noise

• GPIO outputs available

• LED status indictors

• Fused power line

• Excellent results from on-air tests

K5TRA

Questo è Tutto

15T.Apel