RADIO Systems:

Question 1

RADIO FREQ:

Travel Progression

Answer 1

• Radio handheld unit (RF Signal)
• RF to BS (Base Station) BS convert RF To Audio
• From BS to CB
• CB conn to T1
• T1 conn to DWDM/SONET (across network)
• Other side T1 to CB
• CB to Head End Equip (JSQ Frame Room)
• JSQ Frame Room to PTCC Train-Master

Question 2

RADIO CHANNELS:

Answer 2

R1 - Train to Wayside
R2 - R3 Repeater
R3 - Maintenance/Security/Passenger Agents.
R4 - Portable to Portable (Line of Sight)

Question 3

PORTABLE RADIO/TRAIN SIGNAL FLOW:

Answer 3

•Triplexer~BS~CB~T1~SONET~T1~CB~Head End~PTCC

• Portable Radio
• To RF Signal(Antenna)
• RF Signal Into Triplexer
• from Triplexer Split into R1,R2,R3 (Receivers)
• Goes to BS (Main A) “Standby B”
• BS to CB (now Audio)
• from CB to Head End Equip

Question 4

BS REDUNDANT:
(36 BS Total)
(5 TRIPLEXERS Total)

Answer 4

• R1 - A/B
• R2 - A/B
• R3 - A/B
• 5 BS Locations - NWK, JSQ, EXCH PL, CAISSON I, 19th ST.
• (WTC will be 6th BS)

Question 5

RADIATING CABLE

Antenna

Answer 5

• RF Freq. travels on

* Sizes 7/8, 1-1/4, 1-5/8

Question 6

CPI

(

Answer 6

• Looks like phone Train-Master uses them.
• HOBAN Only
• TX/RX Can hear anyone on Freq.

Question 7

PORTABLE NOTES:

Answer 7

• Must be programmed for repeater
• Portables on REG. R3 might be able to talk to each other if in close proximity.
• REG. R3 can hear “REPEATER R3 but can’t talk
• REPEATER R3 Portable CANT hear REG. R3
• IVCS and CPI on R3 can TX/RX to any REG/REPEATER R3 Portable
• R2 does NOT exist for IVCS and CPI
• All REG. R3/REPEATER R3 are recorded on Audio Recorder R3 channel.