Custom Products for the Digital Radio Amateur Enthusiast

Looking for radio adapters for AllStar Link applications? See our original RA-Series.

Masters Communications Digital USB Radio Adapters - Standard Features:
These standard features are included in all DRA Series Radio Adapters.

• All models exhibit extremely low noise on both the receive and transmit audio paths.
• VARA HF, VARA FM, SoundModem (Packet) & other Digital Data Compatibility.
• DB-9F (DE-9F) radio connection that matches the Kantronics KPC-3 (DRA-30, 45, and 65)
• RJ45 radio connection for possible reuse of SignaLink® USB radio cables (DRA-34, '39, '54, 'SR-RJ45, and DRA-100-RJ45)
• Mini-DIN-6 female radio connection for easy connection to radios with a similar Data Port (DRA-36, 50, 50M, 52, 70, 80, DRA-100-DIN6 and DRA-SR-DIN6)
• 1200, 9600 Baud (Packet) and Level 13 VARA FM Wide data speeds are possible.
• 2 - TX audio level potentiometers - one for each channel (the smaller pots).
• RX level potentiometer for manual receiver audio calibration (the larger pot).
• 3 - Status LEDs.
• USB "B" computer connection.
• New 3ft USB "A" to USB "B" 2.0 cable normally included.
• A genuine crystal-stabilized C-Media CM119A.
• High quality machine sockets for all conventional DIP ICs.
• Access to all GPIO from circuit board 'lands' marked G1 through G8.
• HeartBeat monitor to prevent stuck PTT should something fail.
• Operation from 5V (via USB cable) - power to run it comes from the computer.
• Windows® & LINUX compatible.
• All unassembled kits come with surface-mount ICs pre-installed.
• All unassembled kits come complete with all of the required through-hole components - you solder it together!
• Optional Metal or Plastic Case available to protect the unit.
• All DRA products are available completely Assembled & Tested for an additional fee.
• Assembled and Tested DRA's are FCC Part 15 Class B Certified.
• 90 day Limited Warranty. Repair available for units out of or not covered under warranty (my determination).

Masters Communications Digital USB Radio Adapters - Individual Features:
Click on a model number for product photos, or ordering.

Feature (below)     - -         Product -->
Radio Connector (female)	DB9	RJ45	Mini-DIN-6	RJ45	DB9	Mini-DIN-6	Mini-DIN-6	RJ45	DB9	Mini-DIN-6	Mini-DIN-6	RJ45 or Mini-DIN-6	RJ45 or Mini-DIN-6
Elevated transmit audio level capability (Note 1)	N	N	N	N	Y	Y	Y	Y	Y	Y	Y	Y	Y
VOX derived PTT Capability (Note 2)	N	N	N	N	N	N	N	N	Y	Y	Y	Y	Y
Relay for PTT (Note 3)	N	N	N	N	N	N	Y	N	N	N	Y	Y	Y
Variable VOX Delay	N	N	N	N	N	N	N	N	N	N	N	Y	Y

Note 1:   Some radios require a higher audio level for VARA FM Wide or 9600 baud connection speeds.
The DRA-30, DRA-34 and DRA-36 have lower transmit audio level capability that may be insufficient for some radios, especially at higher speeds.
Note 2:   Many programs like VARA FM, VARA FM Wide, VARA HF, FLDIGI, Direwolf, and SoundModem don't require VOX, but FT4/8, SSTV and some others do.
Note 3:   Some ICOM radios don't respond to transistor keying circuitry. A relay alleviates this problem.
The ICOM IC-706MKIIG and ID-880H are two such radios requiring a relay.

This information is great - but, which one of these should I buy?
Go here first to see if your radio is listed.
Then - if your radio isn't listed in the article above - click here to help make a decision.

Other Options:
DRAC-12 - 6-foot Mini-DIN-6 Radio Cable   can be added optionally to connect your data capble radio to the DRA-36, DRA-50, DRA-52, DRA-70, DRA-80, DRA-100-DIN6, and DRA-SR-DIN6.
SPKR-4 - 3-foot 1/8" Speaker Cable   can be added optionally to connect your DRA-39, DRA-SR-RJ45 or DRA-100-RJ45 receive audio from the radios speaker jack.
DRA-DIN-6 radio connector adapter can be added optionally to the DRA-30, '45, and '65 to convert the DB9 radio connector to Mini-DIN-6 female.
RJ45-6 radio connector adapter can be added optionally to the DRA-30, '45, and '65 to convert the DB9 radio connector to RJ45 female. Great for reusing your existing SignaLink® USB radio cables.
VOX-10 Voice (DATA) Activated PTT adapter for the DRA-45 The VOX-10 can be added optionally to the DRA-45.
Alinco-6 radio connector adapter For use with the Alinco DR-x35 series single band radios to convert the DB9 radio connector to Mini-DIN-6 female.
DRA-Case can be added optionally to any of the RA or DRA Series radio adapters (except SR and '100) to protect it.
It's a nice snap together, plastic case. Available in several colors!

More Information:
Click here for detailed digital radio adapter descriptions and explanations.

DRA-30 Low-Cost High-Quality digital USB radio adapter with a DB9 radio connector.
DRA-34 Similar to the DRA-30 but with a RJ45 radio connector.
DRA-36 Similar to the DRA-30 but with a Mini-DIN-6 radio connector.
DRA-39 Similar to the DRA-30 but with a RJ45 radio connector, configuration socket, and works with SignaLink radio cables.
DRA-45 High-Quality digital USB radio adapter with TX audio amplifiers and a DB9 radio connector.
DRA-50 Similar to the DRA-45 but with a Mini-DIN-6 radio connector.
DRA-52 Similar to the DRA-50 but uses a relay to properly key some ICOM rigs like the ICOM ID-880H, IC-706MKIIG and variants.
DRA-54 Similar to the DRA-50 but with a RJ45 radio connector.
DRA-65 Similar to the DRA-45 but with VOX capability.
DRA-70 Similar to the DRA-65 but with a Mini-DIN-6 radio connector.
DRA-80 Similar to the DRA-70 but uses a relay to properly key some ICOM rigs like the ICOM ID-880H, IC-706MKIIG and variants.
DRA-100 Similar to the DRA-80 but has VOX delay and an all aluminum case.

DRA-SR Intended for those who already own a SignaLink® USB and want to upgrade it to DRA functionality and performance.

Email Kevin Custer for ordering information, ordering by check, or support of these exciting products.

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 February 3, 2020, WA1MIK All Rights Reserved!