C-11166/GRC-206 Universal Radio System Control  URSC

Brooke Clarke 2008


C-11166/GRC-206
        Universal Radio System Control URSC

Background

This is the control box for the GRC-206 system.  It's designed so that it can be placed between two operators and they each can control some part of the system.  It connects to the system by either fiber optic cable or a wired connection.  The GRC-206 system supports two of these controllers (up to four operators, all at one time?).
 When used remote from the system it's powered from a couple of BA-5590 batteries (my 5590BAv2 battery adapter works).  Don't yet understand why there's two batteries.

Numbers

NSN: 5820-01-411-2903
p/n:
724760-801

p/n: 812085-801
NSN: 5820-01-141-4878
FO4606-81-C-0017contract:

Connectors, Controls and Displays

Right Side

The Fiber Optic connector for a two core cable (probably one for Tx and one for Rx).  Also J6 a 5 male pin circular connector marked PWR which can be used to power the control when it's mounted in a vehicle to save the batteries.  Also J6 probably supports a wire line interface in lieu of the fiber optic interface.  That would allow removing the FO cable when the control is mounted in the vehicle.  Note that J6 would mate directly to either J8 or J9 on the Signal Distribution Unit reinforcing the idea that you can use either a wired or FO interface.

In the photos below of the Fiber Optic connector the fiber at the bottom  (the taller one) is the transmit fiber.  The fiber light source is IR so is not visible to the naked eye.  I was hoping that the digital camera's IR response would be enough to see the IR but it's a subtle difference between on and off.
Visible C-11166
              Off
Visible C-11166
              On
IR C-11166 On
Visible Light C-11166 Off
Visible Light C-11166 On IR (PAS-6)  C-11166 On

Front Panel

Left to right, top to bottom:
Battery off - ON switch
Four Displays, one each for HF, UHF-AM, VHF-FM, STATUS, VHF-AM and in the center a Red Lamp OPEN CABLE.
MUTE - ON switch
OFF-LIGHT knob
SPKR OFF-VOLUME knob
Volume knobs for: IC, VHF-FM, UHF-AM, VHF-AM, HF

Left Operator's Controls

MSTR-VOL knob
Data U-229 type connector
HANDSET U-299 type connector
radio select switch: OFF, IC, VHF-FM, UHF-AM, VHF-AM, HF

Right Operator's Controls

MSTR-VOL knob
2 each HANDSET U-299 type connectors (maybe only the left operator can use data communications?)
radio select switch: OFF, IC, VHF-FM, UHF-AM, VHF-AM, HF

Common Keypad

This is a 5x5 keypad with markings as shown below that's shared by the two operators.
<- OPER
1
2
3
OPER->
USB
4
5
ACT
6
GD
LSB
7
8
TOD
9
DF
TONE
SQL
CLR
HWT
0
PST
ENT
SPKR
IC
VHF
FM
VHF
AM
UHF
AM
HF

Left Side

Fold up carrying handle.

Top

Speaker

Bottom

Battery compartment for two each BA-5590 (or equivalent) batteries.  It's difficult to remove a battery.  So it's good to put some cord or belt around the battery BEFORE installing it into the box.  I used a length of dental floss and doubled it.  We'll see when I try to get that 5590BA out.
C-11166 Dual
        BA-5590 Battery Compartment
I'm using one of the 5590BAv2 battery adapters to power the C-11166.  The dental floss is there to help get the battery out since there's not much exposed to get a good purchase on the battery.

It's not clear why two batteries are being used.

Operation

When a single 5590BA battery adapter is installed and the BATTERY switch is turned ON there are some sounds and the STATUS display window shows OPEN  CABLE FAULT and the red OPEN CABLE lamp is one.  Noise background and a constant tone.
The other displays are not showing any data. but the segments can be seen:
HF:  "call", dd.dddd, U, L, SQL, PT
UHF-AM: "call", ddd.ddd PT GD SQL
VHF-FM: :call" dd PT MNL
VHF-FM: "call" ddd.ddd PT DF  GD SQL

Inside

C-11166/GRC-206
          InsideBattery Box

Shown at the top of the photo is the battery box.  It contains the two BA-5590 batteries and in the lower left the fiber optic interface  in subassembly A1J1 with it's owncqble and 2x5 header.  J6 the wireed power and control connector has Red, Black, Violet and Orange wires plus a black chassis ground wire going across to the other side of the box.  The Red and violet wires go to P2 mating with the front panel.  The black and orange wires go to a 2x13 headet connected to  p/n 812666-801subassembly whose function may be related to power conditioning.  J1 on this assembly goes to the fornt panel.  A guess would be the three cables are for: fiber optic data, wire line data and DC power.

J6 PWR is a MS 3114E-10-6P this is a six pin connector wired:
Pin
Wire
Destination
Function
A
nc


B
big black
P2x13-opposite 7
gnd
C
violet
P2-7

D
orange
P3-opposite 3

E
red
P2x13-1

F
small black
E9 chassis ground
gnd



C11166A

C-11166A/GRC-206(V)3 Universal Radio System Control URSC

This is for the GRC-206(V)3 that uses the RT-1523 SINCGARS VHF FM ratios instead of the Vietnam era RT-246.

Related

The two web pages that have information on the GRC-206 are: PRC-104 and MT-6250.


GRC-2006 is a very similar dual remote control probably for the same FAC function, but a different compliment of radios.



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