Custom Products for the Digital Radio Amateur Enthusiast

Quick Explanation:
The DRA-39M sound card is made specifically for our extruded & anodized Metal-SC Cases. The "M" Series sound cards have the same high-performance as our Standard Series, and in most cases even have the same model number - just with a M appended to the end.

The DRA-39M is a mechanically and electrically refined DRA-39 that has easier to access headers and jumpers, and, (mostly) eliminates the need for adapter rails and their associated attachment hardware.

Revision 2 puts the blue COMM OK LED on the front panel, and adds selectable Relay or Transistor PTT keying. All usable features are retained, and all jumpers are numbered the same as a DRA-39.

   
DRA-39M Front and Rear

More information for those willing to continue reading:
If you've ever purchased a DRA-30 thru DRA-80 along with a Metal-SC case, you know that adapter rails are used to make the board wider and longer - so it can slide into the mating slots of the metal cases. The rails are simply installed as part of the build process. The M Series circuit boards eliminate the need for adapter rails and maximizes usability because the board is a little larger. The new boards slide directly into the slots of the metal case. The boards have a tinned copper shielding enhancement area that slides into the slots of the metal case. This tinned area maximizes the coupling between the board and case and minimizes RFI.

Plastic cases allow all LED's to be viewed from the top. Prior to REV2 M Series boards - there was no easy way to view the blue COMM OK LED when a board was placed in a Metal-SC case. As shown above, a new front panel adds the blue LED, and new rear panels properly identify the M Series boards.

The PTT keying method is selectable by two mechanical jumpers. You choose between Transistor or Relay keying. The Relay position adds functionality that the DRA-100 has, being compatible with all radios, including the ICOM IC-706MKIIG and ID-880H. The Transistor position insures the fastest keying on radios that are okay with electronic keying. A reed type relay minimizes the keying delay when this option must be used.

Because the M series circuit boards are slightly larger, we now have the room to move things around without compromising performance. In the case of the DRA-39M - we've moved JU3, the TX Channel header to a more easily accessible spot. Needle nose pliers are no longer required to move any jumpers.

All other headers and jumpers are easily accessed and share the same numerical designation as the original DRA-39. Even the part numbers are the same between the two boards. If you know these boards well - you won't need to learn anything new!

We currently make the following M Series products:

RA-DR1XM

And - we'll still supply any other Standard RA or DRA board in a metal case when that option is chosen - using adapter rails and hardware.

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

Product of Masters Communications, all rights reserved.
Specifications may change without notice.
Images are property of Kevin Custer - W3KKC
Board layout by Kevin Custer - W3KKC
HTML January 3, 2024, W3KKC All Rights Reserved!