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

© Brooke Clarke 2008

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

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

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.

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.

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.

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

Battery 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

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