Valiant 153M

GB-GRAM/GB-GRAM-M Interface Card


Valiant 153M is a GB-GRAM/GB-GRAM-M (GB-GRAM/M) interface card that allows the simultaneous operation and testing of a commercial- off-the- shelf (COTS) receiver and a GB-GRAM/M. Both receivers can be powered and communicate using a single USB mini cable. By integrating a COTS receiver onto the Valiant 153M, users can perform cross checks to determine if the military receiver is connected and communicating data properly. Both receivers communicate via the onboard USB mini or RS-232 serial connectors. The Valiant test fixture was designed to be nearly the same size as the GB-GRAM/M type I card.


The Valiant 153M excels within valuable criteria for testing in lab and field test environments.



The integrated COTS receiver allows test engineers to confirm that their setup and receiver is properly configured. By observing the data output, engineers can know for certain that their antenna, power, and communication is successfully connected to the Valiant interface card. From there, cross-checks can be performed to make sure the military receiver is reporting the same data as the COTS receiver. The COTS can also act as another unit under test (UUT) during the field test.

It is slightly larger than the type I card so that the GB-GRAM/M can be fully placed inside the case. The Valiant 153M can be powered by a USB mini cable, or a 5V wall wart providing options for test engineers. Not only does the USB mini power the board and both receivers (legacy GB-GRAM) but it can also provide data communication for both the GB-GRAM/M and the integrated Ublox receiver. Finally, with one RF input, you can provide GPS signals to two receivers allowing for more UUT’s.

The proper operation of the two receivers can be examined using Talen-X’s software suite, RxStudio. This software suite allows a user to communicate to the receivers simultaneously and visually examine their performance (C/No, SVs tracked, SVs used, LLA, time, code types, assurance, frequency, etc).


a. GB-GRAM Type I
b. GB-GRAM Type II
c. GB-GRAM-M Type I
d. GB-GRAM-M Type II

Size, Weight, Power, and Temperature

a. Size: 4.1” x 2.9” (LxW)
b. Weight: approximately 60 grams
c. Power: < 0.5W (without GB-GRAM/M)
d. Operating Temp: -20 ͦ C to +65 ͦ C


a. GNSS RF Input with 3.3V Output


a. GPS Signals Passed Through
b. Connects to the Input of the GB-GRAM/M
c. 3dB Load On-board
d. DC-Blocked

HD15 Keyfill Connector with Key Switch

a. DS101 Keyfill Protocol (Towards HD15)
b. DS102 Keyfill Protocol (Towards AUX PWR)

Zeroize Pushbutton

a. Depress to Zeroize GB-GRAM/M

GB-GRAM/M Data with Logic Level (Interface)

a. COM1: RS-232 (DB9)
b. COM1: CMOS (10-pin Header)
c. COM2: USB (USB Mini)
d. COM2: CMOS (10-pin Header)
e. COM3: CMOS (10-pin Header)
f. BDDP: CMOS (10-pin Header)

GB-GRAM/M Pulse Per Second Outputs

a. COM1, COM2, COM3, and BDDP


Three High LEDs

a. Bottom: GB-GRAM/M Pulse Per Second
b. Middle: Ublox Pulse Per Second
c. Top: Power

Power Switch

a. Low Power Mode: 2.5W Max, USB
b. High Power Mode: 20W Max, 5V Barrel

Barrel Power

a. 5V 4A Power Input: 2.1mm I.D x 5.5mm O.D

USB Power and Communication

a. 5V 500mA Power Input: USB Mini
b. Provides USB Communication to the Ublox
c. Provides USB communication to the GB-GRAM-M COM2

GB-GRAM/M Auxiliary Power with Switch

a. On-board 3V CR2032 Backup Battery
b. Auxiliary Power Connector for Higher Power

GB-GRAM/M Power Switch (POF)

a. On/Off Switch for the GB-GRAM/M

Auxiliary GB-GRAM/M Interfaces (Key Pins, PPS IN, TOD, Key Success)

a. Keying Pins 9, 12, 28, and 29 (10-pin Header)
b. PPS Input
c. TOD Output
d. Successful Keyfill

Ublox GNSS Receiver

a. Ublox ZED-F9P Precise Timing Module
b. GPS L1, QZSS L1, SBAS L1, GLO L1, and BeiDou B1
c. 72-channel Navigation Engine
d. 10 MHz Output Timing Reference
e. 1 Pulse Per Second Output
f. RS-232 Ublox Data Output (10-pin Header)

case open-attached
Case open from back
Case open from front
Case open from above
case closed from back
case closed from front