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4.2
PTC-11pro
DSP
Multimode
Compress 2 0 Compress I
IdleO Request
Tracking C ) Phasing
Traffic O Error
MARQOK O MARQIN
sendO CHO
ooooooooooooooo
The SCS PTC-IIpro is equipped with 15 LEIYs to display status information, a fifteen LED
tuning indicator and a ten characteralphanumeric LED display to show the operating mode.
The meaningof the LED's is shownbelow.
Idlc/Request:
When Idle lits, then it means that at least one "filler" character (idle) is contained in the present
packet.If Requestlits, then the other stationhasrequesteda repeat of the last sentdata or
control packet.
Traffic/Error:
When Traffic lits, the system transfers data and the HF-channel is operating. In STBY
condition (not in Listen mode)the Traffic-LED showswhenthe channelis occupied(channel
busy).If Error lits, the packetor controlsignalhadbit errorsandcannotbedecoded.
Send/CHO:
Send shows that the PTC is the actual packet sender.The CHO lits in the moment a change
over (changeof transmit direction) occurs and goesoff when it is finished.
Cornpress2/Compress1:
Displays the compressionmethod currently used. CompressI is Huffman coding, Compress2
ispseudo-Markowcoding.Ifthe LED is off, thenthe actualpacketis anuncompressed p acket.
Tracking/Phasing:
Tracking lits for a short while when the PTC changesthe carrier frequency during a PACTOR-
II link. Phasing is active if a new phasing takesplace in AMTOR (ARQ & FEC).
MARQ-OK/MARQ-IN:
MARQ-OK lits when the actual packet was reconstructedusing memory ARQ. MARQ-IN
showsthat the current packet is accumulatedfor reconstruction.
DQPSK/DBPSK:
Theseare activated (also during Unproto and Listen mode) dependingon the modulation
currently being used, DQPSK or DBPSK.
MaxSpeed/HiSpeed:
MaxSpeedlits during 16-DPSKpackets(also with Unproto and Listen modes).HiSpeedlits
during PACTOR-I packetswhich are 200 baud (also with Unproto and Listen), and when
PACTOR-II packetswith 8-DPSK areused.
PACTOR-Controller
DQPSK O DBPSK
MaxSpeed O HiSpeed
Connected O Mail
Figure 9: The PTC-11pro front
4. LED's
PRI O PTT
C) Connected O Carrier
PR20 PTT
O ConnectedO Carrier
scs
PTC-1/pro
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