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VT Miltope RPDA-1

Tough, versatile PDA platform for the military
(by Conrad H. Blickenstorfer)

The VT Miltope RPDA-1 is a modern, expandable and highly configurable rugged PDA clearly designed for military and other government applications, and in particular for the US Army CHS-4 (Common Hardware Systems-4) program.

Like a lot of computing hardware designed for military purposes, the RDPA-1 combines reasonably current COTS (commercial off the shelf) components, great configuration flexibility, and military standard ports into a unit designed to be compact, light and tough enough to provide real value, situational awareness, and a strategic advantage out there in the field.

What Miltope came up with to meet those demands is a PDA platform large enough to accommodate a 4.1-inch display and the requisite ports and connectors, but not so large as to weigh soldiers down. That said, the RPDA-1's 6.5 x 3.6 inch footprint is larger than that of even the biggest current consumer smartphone, and the device also weighs over a pound; there's just no way around that. It is also capable of being loaded with either Windows CE, Windows Mobile, Linux or Android. Finally, the military has different connectivity requirements, and the RPDA-1 meets those as well.

Covering so many bases means a platform that's as open as possible, which in turn means certain compromises. The processor, for example, must be able to run all those different operating systems. The Texas Instruments OMAP 3530 Miltope chose does that. It's a competent chip that's also used in such high-volume devices as Intermec rugged handhelds and also by some Winmate devices, but is not at the performance level of the speedy dual- and quad-core chips running in modern smartphones.

The choice of display and digitizer, likewise, must have been a difficult one. Windows CE and Windows Mobile were designed for use with a stylus, Linux can be anything depending on its shell, but Android definitely works best with capacitive touch. As is, the RPDA-1 seems to have a resistive digitizer, with the advantage being that it can be used when and where it's wet. As far as screen size and resolution go, both are adequate and a good compromise.

Providing for all the necessary and anticipated connectivity in a device like this is difficult as well. While a modern smartphone can do with a single tiny micro-USB port, a military device may have to accommodate numerous standards, and whatever ports are used must be waterproof and sturdy (which micro-USB definitely is not). As a result, there is a screw-on Taclink connector to talk to a Taclink modem, a surface-mount connector, and a 15-pin connector that presumably handles RS232 serial as well as USB host and client.

As the pictures on top of the page show, the RPDA-1 can be paired with the RPDA-1P PC Card expansion module or the RPDA-1S with a TACLINK 3000+ modem as well as an integrated SAASM GPS receiver with L1/L2 antenna as well as connectivity with external GPS antennae and serial interface equipment.

The RPDA-1 looks rugged, and it is. VT Miltope literature lists almost 20 environmental and EMI/EMC tests the device has been subjected to, so it's safe to assume that all the ruggedness criteria are covered.


Since 2003, Miltope is part of Vision Technologies Systems, Inc., a multi-national engineering group engaged in aerospace, electronics, land systems and the marine sector, itself the US subsidiary of ST Engineering Ltd of Singapore. The VT Miltope arm makes rugged computers and computer peripherals, designed and manufactured in the US, for military, industrial and commercial tactical and aviation applications.

In October 2011, VT Miltope announced it was teaming wth General Dynamics C4 Systems on the Common Hardware Systems-4 (CHS-4) program, a five-year, Indefinite Delivery/Indefinite Quantity (IDIQ) contract with a potential value of $3.7b and a potential for VT Miltope to earn up to $250m over the life of this contract. VT Miltope will provide three military rugged products under this contract vehicle that will meet V2 and V3 CHS-4 environmental and EMI requirements. These products are the Enhanced / Rugged Handheld Terminal Unit, Rugged Portable Digital Assistant, and Notebook Computer Unit (see Miltope press release).

Specifications VT Miltope RPDA-1
Status Added 05/2013
Product type Rugged military PDA
CPU Speed Texas Instruments OMAP 3530/600 MHz
OS Microsoft Windows CE 6.0, Windows Mobile 6.5, Linux, Android 2.2
RAM/ROM 256MB LPDDR/16GB
Card slots 1 SD card, opt. PC card expansion module with 2 Type 2 or 1 Type 3 PC Card
Display type Sunlight-readable TFT
Display size/res Backlit 4.1-inch/480 x 800 pixel
Digitizer/pens Touch/1
Keyboard/keys Function and 4-way direction
Navigation Touch/stylus
Housing Unknown
Operating Temp MIL-STD-810F, Method 501.4, (0° to 125°F)
Sealing Unknown
Sand/dust MIL-STD-810F, Method 510.4, Proc. I and II
Immersion MIL-STD-810F, Method 512.2, Procedure I
Transit drop MIL-STD-810F, Method 516.5, Procedure IV
Size (WxHxD) 6.5 x 3.6 x 1.2 inches (165 x 91 x 30 mm)
Weight 17 oz. (480 g)
Power 4,000mAH Li-Ion (hot-swappable via embedded 740 mAhr Li-Ion)
Interface USB 2.0 host, USB 2.0 client, RS232, audio
Wireless 802.11b/g WiFi, opt. Bluetooth
List price Inquire
Contact www.miltope.com
Product page RFPA-1
Brochure RFPA-1
Windows Mobile Info
  • Windows 10 IoT Core
  • Windows Embedded 8.1 Handheld
  • Windows Embedded Compact 2013
  • Windows Embedded 8 Handheld
  • Windows Embedded Compact 7
  • Windows Embedded Handheld
  • Windows Phone 7
  • Windows Embedded CE 6.0 R3
  • Windows Mobile 6.5
  • Windows Mobile 6
  • Windows CE 6.0
  • Windows Mobile 5
  • Windows CE 5.0
  • Windows Mobile Smartphone
  • Windows Mobile 2003
  • Windows CE .Net
  • Windows for Pocket PC 2002
  • Pocket PC intro 2000
  • Windows CE H/PC Pro 1998
  • Windows CE 2.0 1997
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