Joint Tactical Radio System (JTRS)

Background
Description
SR-702G Receiver-Transmitter
Photos
Related
References
Links

Background

JTRS (Wiki) is a program to replace most of the 750,000 military tactical radios with a new Software Defined Radio (Wiki: SDR) that will be easier to upgrade and add new waveforem (Wiki).
Started with a $2 million contract with Boeing in 2000 and the program was cancelled in 2012 after spending about $6 billion. The problem is that when you have one box do the work of many boxes is does none of the jobs well and overall is heavier and consumes more power than a single task box.

Also see EPLR (Wiki), a similar idea

Description

SR-702G Receiver-Transmitter

There are two of these RT boxes in the JTRS system.

Photos

Fig MM-1 First Guess Left to Right
Note: 4 mounting knobs, so 4 boxes.
1ea: Rack Frame and common bus
1ea: Power Supply - Transmit Power Amp
2ea: receiver-exciters
1ea: Cryptography processor

J1: 28 VDC
J2: RFCB
J3: ?
J4: RFCB
J5: ?
J1: RFCB
J2: 30-2000 MHz
J3: 2-30 MHz
J1: RFCB
J2: 30-2000 MHz
J3: 2-30 MHz Off-On-Zero
J2 BLV?
?
HUB ?
Fill
Audio
CW?
?

Fig 1 SR-702G
P1 - Control & Power
Part number for the connector on the JTRS slice:
Amphenol 10-504913-010
----------------------
Mating part for the backplane: Amphenol 10-504912-010

Fig 2 SR-702G

Fig 3 SR-702G
Left block: RF board Right: DC and Signal Processing

Fig 4 SR-702G
J1: is a special 4 terminal connector (maybe wideband IF)
J2: 30 - 2000 MHz Ant
J3: 2 - 30 MHz Ant

Fig MM-2

Fig MM-3
Fig MM-4
Fig MM-5

References

Center for Public Information - Failure to communicate: Inside the army's doomed quest for the 'perfect' radio -
NPR: Army scraps most of the JTRS program(Transcript) -

Links

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Page Created Feb 3, 2017