Custom Products for the Digital Radio Amateur Enthusiast
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Custom Products for the Digital Radio Amateur Enthusiast |
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Product Support Documentation
Model DRA-39M
A Radio Interface for Digital Two-Way Radio Applications
Top side of DRA-39M (REV2) board - shown slightly enlarged.
(Click photo to show a larger image)
REV2 Schematic Image - Click to download a high quality PDF.
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 Jumper Settings and other board connection assignments.
RJ45 Pinout
Click here
for RJ45 Pinout.
Recommended receive audio input level:
The DRA-39M 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.
1/8" audio input jack:
Unlike most other DRA's, the DRA-39 has a 1/8" jack located on the rear panel for receive audio.
This is an input which can be driven from the speaker jack on the radio - when required. This
jack is switched, and when no plug is inserted, audio is routed from pin 16 of the configuration
socket to the input of the board. Inserting a plug into the socket takes priority and
disconnects audio that appears at pin 16.
All DRA-39M's are supplied with a Genuine C-Media CM119A, but the DRA-39M 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-39M main page.
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 April 20, 2024, W3KKC All Rights Reserved!