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net. 
NO RCVD MSGS  No messages have been received. 
PAC FAIL  Failure radio in PA coupler. 
POSN RPT FAIL  Current location or GPS position report was not 
transmitted. 
PRE -NO DATA  Preset data not loaded. 
PTT FOR XMIT BIT  Instruction to press microphone PTT switch to en-
able transmission BIT. 
RCV BIT -GO  Receiver BIT functions completed without failure. 
RCV READY  Ready to receive ECCM transmissions. 
RCVG PREAMBLE  ECCM preamble being received. 
RCVG DATA  Radio currently receiving data. 
RT FAIL  Receiver Transmitter inoperative. 
RX-TX DEGRADED  Receive and transmit capabilities are degraded. 
RX-TX FAIL  Radio cannot receive or transmit. 
SENDING DATA  Radio currently sending data. 
SENDING POSN  Radio sending GPS position report. 
SOUND  Radio sending an ALE sound. 
SYNCING  Time synchronization being performed. 
TESTING  BIT in progress. 

Table 3-2. AN/ARC-220 Messages (Cont)
ERROR  MESSAGE  ACTION 
TIME SYNC FAIL  Radio failed in attempt to synchronize. 
TRANSEC FAIL  BIT detected a failure that will not allow ECCM operation. 
TUNE XX%  Indicates percentage of ECCM frequencies tuned for current net. 
TUNING  Radio is currently tuning itself. 
TX DEGRADED  BIT detected a failure that is causing transmission capability to be degraded. 
TX FAIL  Radio cannot transmit. 
UNSYNC  ECCM is not synchronized. 
UNTUNED  An ECCM hop set is not tuned. 
XMT READY  Radio is ready to transmit in ECCM mode. 
ZEROIZED  All mission data.ll and keys have been erased. 

3.10 TSEC/KY-100 SECURE COMMUNICATION SYSTEM.
The TSEC/KY-100 provides secure, half duplex voice, digital data, analog data and remote keying capabilities for transmission over the HF radio. It has six operational modes, and can store often used settings on presets. Power is supplied from the No. 1 dc primary bus through a circuit breaker marked HF SCTY SET.
3.10.1 Controls and Functions. The KY-100 is con-trolled by the AMS with the CDU (Figure 3-2). Pilot input is through a control screen (Figure 3-15), accessed by pressing INI, then FILL soft key, then KY-100 soft key. Indications and soft key functions are as follows:
3.10.1.1 KY RTU Screen. Mode screen:
SOFT KEY  FUNCTION
gINIT KEY  Selects operating modes.
gUP ARROW  Acts as an up arrow key.
gRIGHT  Acts as the right arrow key.
ARROW
SOFT KEY  FUNCTION
gBOTH Same function as pressing both ARROWS arrow keys at the same time.
PT/CTs  Toggles between plain text and cipher mode voice.
OFFLINEs  Off line mode disables communications and accesses screens to select mode settings, test, and .ll screens.
ZERO ALLs  Erases all keys in the unit except the emergency backup key.
3.10.2 Starting Procedure.
3.10.2.1 Cold Start. A cold start is performed when there are no traffic keys in the KY-100 at start up.
1.
Access KY-100 screen by INI, then FILL soft key, then KY-100 soft key -Press.

2.  
OFFLINE soft key -Press. TEST will be dis-played.

 

SK.1
SK.6
SK.2
SK.7
SK.3
SK.8
SK.4
SK.9
SK.5
SK.10
AB0614
SA

3. UP ARROW soft key -Press. KEY OPS will  9. On KYK-13, place Fill switch to next .ll. 
be displayed. 
10. Repeat steps 6 through 9 for each key .ll re-
4. Connect KYK-13 KY-100 .ll port on lower  quired for loading. 
　
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