Custom Products from Masters Communications

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.

Install all 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 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. Small capacitors are identified as follows: "47" or "470" = 47pF, "104" = 0.1uF, in other words the first two digits are the value and the third digit (if present) is the number of zeros you add to determine the 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 board. It's helpful to look at the photo above.

Install the crystal - with plastic spacer.

Then, install the 3 LEDs (short lead to the square hole).

Install the potentiometer.

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

Next, install the larger capacitors.

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

Test your board to make sure it works properly before installing it into its metal case.

When you're sure it works properly, install the vinyl protective sticker on the bottom (solder) side of the circuit board using proper alignment. While the inner surface is annodized and therefore insulated, it's best to install the sticker to insure the board doesn't contact the case.

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

Email Kevin Custer for support.
 

Custom cables available from URI Cables. They will build a custom cable for the RL-20M 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 March 6 2025, W3KKC All Rights Reserved!