Custom Products for the Digital Radio Amateur Enthusiast

Assembly:
If you purchased our kit, refer to the parts list and make sure you have all of the components you need to build the kit. All of the components are supplied with the kit, and while we make every effort to be sure we didn't omit any components, it can happen. If you are missing anything, or ruin something, just contact us.

Click here for Parts List.

Assembly can be done by personal choice, but you may find it easier to install the shortest components first, building toward the tallest, and finish with the connectors on the ends.
The Parts List has several construction notes as well.

Install all fixed resistors. Some resistors color bands may be hard to make out. If in doubt, use an ohm meter to verify the value before soldering it in place.

Install the crystal.

Install the diodes and shortest capacitors, observing polarity on all diodes and the polarized capacitors! The square pads are the banded end of the diodes and the + of the electrolytic capacitors. When installing the capacitors, observe polarity on the polarized ones! The square pads are the + of the electrolytic and Tantalum capacitors. Small capacitors are identified as follows: "47" or "470" = 47pF, "103" = 0.01uF, "104" = 0.1uF, "105" = 1uF. In other words the first two digits are the leading value and the third digit (if present) is the number of zeros you add to determine the final value.

In addition, there are two components that you need to make sure you install correctly as they are polarized and installed opposite from one another - C3 and C5. The positives of the capacitors face one another - in other words, they go toward the center of the circuit board.

Then, install the 3 LEDs - long lead goes into the round hole.
Note: This is different from the capacitors, where the long leads go into the square hole!)

Install the IC socket.

Install the potentiometers observing their size and orientation on the silkscreen.

Next, install the transistors (flat to flat on silkscreen).

Install JU1 thru JU4 male 2-pin headers.

Next, install the larger capacitors. If required, bend the leads of these straight so they sit down against the board. Long leads go into the square holes. Lead orientation on "NP" capacitors is not critical.

Then, finish by installing the DB9F and USB "B" socket connectors.

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

Email Kevin Custer for support.
 

Custom DRA to radio cables are available from URI Cables. They will build a custom cable for the DRA-30 for many radios.

Product of Masters Communications, all rights reserved.
Specifications may change without notice.
Images property of Kevin Custer - Masters Communications.
Board layout by Kevin Custer - W3KKC
HTML February 3, 2020, W3KKC All Rights Reserved!