Custom Products for the Digital Radio Amateur Enthusiast 		  Print this Page

USB Digital Radio Adapter Interface Board
For Digital Two-Way Radio Applications

Product Documentation
Model DRA-MIX-MUX

REV2 boards adds a relay for keying the radio PTT. Some ICOM radios require this.


Top side of DRA-MIX-MUX circuit board - shown slightly enlarged.
(Click photo to show a larger image)

Bottom side of DRA-MIX-MUX circuit board - shown slightly enlarged.
(Click photo to show a larger image)

Schematic Image - REV1 - Click to download a high quality PDF.


Schematic Image - REV2 - Click to download a high quality PDF.

Overview of DRA-MIX-MUX
The board requires a source of 12V power. This is a nominal figure. It can be anything from 10 to 16 VDC, and must be well filtered. Regulation is not required - but is probably desirable. Power is applied to the two-pin male MOLEX connector observing polarity. The pin closest to the Power LED is positive. A mating female socket connector and 3 spring pins are supplied in a clear bag. You'll need two of these - one is supplied extra. They push into the female socket when oriented correctly so the latch on the spring pin 'clicks' into place. These can be installed on #24 wire and extended to the power supply.
REV2 boards adds a relay for keying the radio PTT. Some ICOM radios require this.

Its operation is pretty simple:
 1 - The Green LED illuminates when power is applied.
2 - Any radio interface or sound card can assert the PTT to the radio. This operation is logically "OR". Any of the three PTT inputs when grounded will cause the radio to transmit and the Red PTT LED to illuminate.
3 - All sound card and/or modem transmit audio sources are resistivity mixed together, and buffered to create one composite TX audio supplied to the radio.
4 - The radios receiver audio is resistivity split and buffered to supply RX audio to all sound cards or modems.

Parts List:
If you purchased our kit, refer to the parts list and make sure you have all of the components you need to build it.
Click here for Parts List.

Construction/Assembly:
Click here for assembly instructions and construction notes - with large photo.

Jumper Settings:
Click here for Header / Jumper settings and other board connection assignments.

Installation:
This device is intended to be installed inside a plastic box for protection. Refer to the schematic for the pinout of the Mini-DIN-6 where all of the logic signals and audio signals are listed.

Recommended powering requirements:
The board needs to be supplied with 12 VDC.

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Product of Masters Communications, all rights reserved.
Specifications may change without notice.
Images property of Kevin Custer - W3KKC
Board layout by Kevin Custer - W3KKC.
HTML December 7, 2021, W3KKC All Rights Reserved!