Custom Products for the Digital Radio Amateur Enthusiast

Differences between the DRA-50 and DRA-52:
The DRA-52 is similar to the DRA-50, but uses a relay to key the radio and eliminates PTT keying issues with the ICOM IC-706MKIIG, ID-880, and some variants. The H1 and H2 headers for installing optional filters were removed as they are never required on radios that have a dedicated Mini-DIN-6 data port. The optional +12V source for powering the LM386 audio amplifiers was removed as there are no radios we're aware of that have a Mini-DIN-6 data connector which require more audio than what's available from the +5V USB power source. The circuitry that supported "Local Control" was removed as there aren't enough pins on the Mini-DIN-6 to utilize the function without soldering wires directly to the circuit board. The removed parts made room on the circuit board for the relay, which takes up a good bit of space.

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 photos.

Jumper Settings:
Click here for header / jumper settings.

Mini-DIN-6 Pinout:
Click here for Mini-DIN-6 Pinout.

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

Recommended powering requirements:
The board is supplied with 5 VDC from the USB connection. Everything, including the audio amplifiers run from this source of power and there is no option on this model for running the audio amplifiers from an external source.

Recommended receive audio input level:
The DRA-52 accepts the widest range of audio compared to any other similar radio adapter. The input signal is attenuated by a potentiometer, giving the broadest range of acceptable levels. As little as 20 mV P-P, and as much as 20 volts P-P. If your receive audio level is adjustable or programmable we recommend around 2.0 volts P-P. This allows very good signal-to-noise ratio and low cabling cross talk. This level results in a 50% rotational setting of the potentiometer.

Optional Plastic Case:
A Plastic Case is available optionally for the DRA-52. Available in several colors!

All DRA-52's are supplied with a Genuine C-Media CM119A, but the DRA-52 board was designed to be versatile. It will accept a CM119 (without the A) and even the CM108. There are slight differences between these components, and the board can be 'programmed' to accept any of the three.

Information on the CM119A.
Click here to download a manual for the C-Media CM119A.

Secure PayPal ordering is available from the DRA-52 main page.

DRAC-12 - 6-foot Mini-DIN-6 Radio Cable  can be added optionally to connect several data capble radios to the DRA-52.

Email Kevin Custer for support, ordering information, order by check, and/or quantity pricing of this exciting product.
 
 

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 August 13, 2022, W3KKC All Rights Reserved!