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l When JTIDS voice communication is selected,
VAJHF plain voice communications
are inhibited. If V/UHF encrypted
voice communication is selected and
JTIDS voice communication is selected,
both V/UHF (encrypted) and JTIDS will
transmit simultaneously.
19.4 V/UHF AUTOMATIC DIRECTION FINDER
(OA-6697)
The’V/UHF automatic direction tinder is used with
the ARC-182 radio in the AM mode (voice is sup
pressed)A. DF providesr elative bearingst o transmitting
ground stations or other aircraft. It can receive signals
on any 1 of 30 preset channels or on any manually set
frequencies in the 108 to 399.975 MHz range.
The system has a line-of-sight range, varying with
altitude. Operating power is 115 Vat t%om the essential
No. 2 bus, 28 Vdc from the essential No. 2 bus, and 26
Vat through the RIO circuit breaker panels. The system
requires a 5-minute warmup period. During the warmup
time, failure indications shouldbed isregardedT. he system
uses a solid-state segment rotation ADF antenna.
Bearing to transmitting stations is displayed on the pilot/
RIO BDHI (No. 1 needle), and on the HSD format of
any MFD. The ADF signal is interrupted during voice
transmissions.
19.5 UHF VOICE SECURITY EQUIPMENT
(TSECIKY-56)
The security equipment is integrated, and operates,
with the V/UHF 1 and 2 communications sets to permit
UHF secure voice in a hostile environment, It shall be
operateda s directedb y appropriatea uthority. Theory of
operation and practical application are covered in the
KY-58 operation manual.
The KY MODE switch and the KY-58 control panel
(Figure 19-12) on the RIO left side console are the only
cockpit controls for operating the KY-58 in either cipher
or plain language.E lectrical power is from the dc essential
bus No. 1 with circuit protection on the RIO dc
essential No. 1 circuit breaker panel, (7C3) KY-%/Z
AHF.
ORIGINAL 19-16
NAVAIR 01.F14AAD-1
NOMENCLATURE FUNCTION
0
ZEROIZE switch ZEROIZE - Guard lifted. The preset codes are erased and must be reset
on the ground by qualified personnel before the cipher mode
can be used.
0
DELAY switch DELAY - Provides a time delay between push-to-talk and actual
transmit.
0
Cipher switch C/RAD-2 - Selects V/UHF 2 for secure voice.
PLAIN - Enables plain audio to pass through without encryption.
C/RAD-1 - Selects V/UHF 1 for secure voice.
c9
FILL switch Selects the position to be loaded with data. MODE switch must be in LD
to load.
0
MODE switch OP- Enables KY-58 operation after unit is loaded.
LD - Used for loading data into KY-58 control panel.
RV - Receiver variable is not operational at this time.
Figure 19-12. KY-58 Controls (Sheet 1 of 2)
19-19 ORIGINAL
NOMENCLATURE FUNCTION
@ POWER switch ON - Used to transmit and receive secure voice communications
over V/UHF radio. Applies operating power to KY-58 system.
0
KY MODE switch BB - Normal mode for FM transmission
(operational only with
KY-58 installed) AUTO - Provides automatic selection of BB/FM and DP/AM. Changes
as the frequency on the V/UHF is changed.
DP- Normal mode for AM transmission.
Figure1 9-12.K Y-58 Controls( Shee2t of 2)
The KY-58 hast wo stateso f operationp: lain and
cipher(C). Plain is used during normal UHF commtmicationsC.
ipheri s usedw hens ecurev oicec ommunications
are desired.T herer ue two cypherm odes:B B
(basebandf)o r use with FM transmissionsa nd DP
@phasef)o r usew ith AM. Ther adios etam ustb e ON
to attains ecureo perationT. her eceivings tationm u.4b e
properlye quippetdo receivetr ansmissionins t hep roper
cipherm ode.
Note
0 Do not transmit plain voice on one radio
during cipherr eceptionso r while transmitting
on the other radio.
l Communicationsb etweenK Y-28 and
KY-58 voice securitye quipmenits not
possible.
19.5.1 KY-58 Operation
19.52 Prelaunch
1. Determineth at properc odeh asb eens et by personneql
ualifiedin voices ecuritye quipment.
2. V/UHF radios - ON.
3. Powerswitqh - ON.
4. Cypher switch - 0RAD 1 or C/RAD 2.
5. KY MODE switch - As Required.
6. If a groundte sto f equipmenist desirede, stablish
two-wsyp lain text radioc ommunicationosn the
plainvoiceradiowithasuitablegroundstationand
requesat n equipmencth eck.
7. Atlera2-minmewarmuppedirn$onthecipherae
lectedn3dio,liatenforasteady,unbrokentoneinthe
headsefot llowedb y a double&chedb mkent one.
8. Key the appropriatera dio selectedfo r tmnsmission,
h old for approximately2 secondsa, ndr eleaseD.
ouble-pitchebdr okent onew ill ceasea nd
　
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