# yaml-language-server: $schema=../../../../../../_schema/ssrf-lite-0.10.0.schema.json
# SSRF-Lite: Chicago Transit Authority (CTA) - Rail and Bus

$schema: "../../../../../../_schema/ssrf-lite-0.10.0.schema.json"
ssrf_lite_version: "0.10.0"
ssrf_lite:
  sources:
    - name: "RadioReference - Cook County, IL (CTA Rail / CTA Buses)"
      url: "https://www.radioreference.com/db/browse/ctid/606"
      accessed: "2026-09-26"

organizations:
  - id: org_cta
    name: "Chicago Transit Authority"

locations:
  - id: loc_chicago
    name: "Chicago, IL (CTA service area)"
    lat: 41.8781
    lon: -87.6298

stations:
  # --- Rail ---
  - id: stn_cta_kyn262
    call_sign: "KYN262"
    organization_id: org_cta
    location_id: loc_chicago
    service: "public_safety_part90"
  - id: stn_cta_kyt938
    call_sign: "KYT938"
    organization_id: org_cta
    location_id: loc_chicago
    service: "public_safety_part90"
  - id: stn_cta_wqdy331
    call_sign: "WQDY331"
    organization_id: org_cta
    location_id: loc_chicago
    service: "public_safety_part90"
  - id: stn_cta_wqdw399
    call_sign: "WQDW399"
    organization_id: org_cta
    location_id: loc_chicago
    service: "public_safety_part90"

  # --- Bus ---
  - id: stn_cta_wsav450
    call_sign: "WSAV450"
    organization_id: org_cta
    location_id: loc_chicago
    service: "public_safety_part90"
  - id: stn_cta_wsav451
    call_sign: "WSAV451"
    organization_id: org_cta
    location_id: loc_chicago
    service: "public_safety_part90"
  - id: stn_cta_wsay246
    call_sign: "WSAY246"
    organization_id: org_cta
    location_id: loc_chicago
    service: "public_safety_part90"
  - id: stn_cta_kls562
    call_sign: "KLS562"
    organization_id: org_cta
    location_id: loc_chicago
    service: "public_safety_part90"
  - id: stn_cta_wprr940
    call_sign: "WPRR940"
    organization_id: org_cta
    location_id: loc_chicago
    service: "public_safety_part90"

antennas:
  - id: ant_cta_kyn262
    station_id: stn_cta_kyn262
    name: "CTA Rail F-1 repeater (site unknown)"
  - id: ant_cta_kyt938
    station_id: stn_cta_kyt938
    name: "CTA Rail F-2/F-5/F-6/F-7/F-8 repeaters (site unknown)"
  - id: ant_cta_wqdy331
    station_id: stn_cta_wqdy331
    name: "CTA Rail F-3/F-4 supervisor repeaters (site unknown)"
  - id: ant_cta_wqdw399
    station_id: stn_cta_wqdw399
    name: "CTA rail heater control (low band)"
  - id: ant_cta_wsav450
    station_id: stn_cta_wsav450
    name: "CTA West bus garages repeater (site unknown)"
  - id: ant_cta_wsav451
    station_id: stn_cta_wsav451
    name: "CTA North bus garages repeater (site unknown)"
  - id: ant_cta_wsay246
    station_id: stn_cta_wsay246
    name: "CTA bus paging/data repeater (site unknown)"
  - id: ant_cta_kls562
    station_id: stn_cta_kls562
    name: "CTA bus voice paging repeater (site unknown)"
  - id: ant_cta_wprr940
    station_id: stn_cta_wprr940
    name: "CTA Rapid Transit Shops (simplex)"

authorizations:
  - id: auth_cta_active
    authority: "FCC"
    service: "public_safety_part90"
    class: "Part 90 PLMR"
    identifier: null
    notes: "Active CTA licence. TX restricted to licensees. RX-only for general public."
  - id: auth_cta_expired
    authority: "FCC"
    service: "public_safety_part90"
    class: "Part 90 PLMR"
    identifier: null
    notes: >
      Source records this CTA licence as EXPIRED, with the frequency reportedly now
      licensed to A-Beep. Operational status unconfirmed - needs survey before relying on it.

rf_chains:
  # ---------------- RAIL ----------------
  # F-1: CPD Transit Alt [Ch 1] - licence expired 4/23
  - id: chain_cta_rail_f1
    station_id: stn_cta_kyn262
    antenna_id: ant_cta_kyn262
    rx:
      freq_mhz: 475.9375
    tx:
      freq_mhz: 472.9375
      emission: "11K2F3E"
    mode:
      type: "FM"
      ctcss_tx_hz: 127.3
      ctcss_rx_hz: 127.3
      notes: "CPD Transit Alt. Source marks licence expired 4/23."

  # F-2: Rail Emergency [Ch 2] (CFD contact) - licence expired 11/22
  - id: chain_cta_rail_f2
    station_id: stn_cta_kyt938
    antenna_id: ant_cta_kyt938
    rx:
      freq_mhz: 473.9875
    tx:
      freq_mhz: 470.9875
      emission: "11K2F3E"
    mode:
      type: "FM"
      ctcss_tx_hz: 127.3
      ctcss_rx_hz: 127.3
      notes: "Rail Emergency; CFD contact channel. Source marks licence expired 11/22."

  # F-3: Supervisors North (includes buses) [Ch 3]
  - id: chain_cta_rail_f3
    station_id: stn_cta_wqdy331
    antenna_id: ant_cta_wqdy331
    rx:
      freq_mhz: 473.5375
    tx:
      freq_mhz: 470.5375
      emission: "11K2F3E"
    mode:
      type: "FM"
      ctcss_tx_hz: 127.3
      ctcss_rx_hz: 127.3
      notes: "Supervisors North; carries bus supervisor traffic as well as rail."

  # F-4: Supervisors South (includes buses) [Ch 4]
  - id: chain_cta_rail_f4
    station_id: stn_cta_wqdy331
    antenna_id: ant_cta_wqdy331
    rx:
      freq_mhz: 473.6375
    tx:
      freq_mhz: 470.6375
      emission: "11K2F3E"
    mode:
      type: "FM"
      ctcss_tx_hz: 127.3
      ctcss_rx_hz: 127.3
      notes: "Supervisors South; carries bus supervisor traffic. Noted at N. Michigan and E. Randolph."

  # F-5: Blue and Pink Line Ops [Ch 5] - licence expired 11/22
  - id: chain_cta_rail_f5
    station_id: stn_cta_kyt938
    antenna_id: ant_cta_kyt938
    rx:
      freq_mhz: 474.0375
    tx:
      freq_mhz: 471.0375
      emission: "11K2F3E"
    mode:
      type: "FM"
      ctcss_tx_hz: 127.3
      ctcss_rx_hz: 127.3
      notes: "Blue and Pink Line operations. Source marks licence expired 11/22."

  # F-6: Green and Orange Line Ops [Ch 6] - licence expired 11/22
  - id: chain_cta_rail_f6
    station_id: stn_cta_kyt938
    antenna_id: ant_cta_kyt938
    rx:
      freq_mhz: 474.0625
    tx:
      freq_mhz: 471.0625
      emission: "11K2F3E"
    mode:
      type: "FM"
      ctcss_tx_hz: 127.3
      ctcss_rx_hz: 127.3
      notes: "Green and Orange Line operations. Source marks licence expired 11/22."

  # F-7: Brown, Purple and Yellow Line Ops [Ch 7] - licence expired 11/22
  - id: chain_cta_rail_f7
    station_id: stn_cta_kyt938
    antenna_id: ant_cta_kyt938
    rx:
      freq_mhz: 474.0875
    tx:
      freq_mhz: 471.0875
      emission: "11K2F3E"
    mode:
      type: "FM"
      ctcss_tx_hz: 127.3
      ctcss_rx_hz: 127.3
      notes: "Brown, Purple and Yellow Line operations. Source marks licence expired 11/22."

  # F-8: Red Line Ops [Ch 8] - licence expired 11/22
  - id: chain_cta_rail_f8
    station_id: stn_cta_kyt938
    antenna_id: ant_cta_kyt938
    rx:
      freq_mhz: 474.1125
    tx:
      freq_mhz: 471.1125
      emission: "11K2F3E"
    mode:
      type: "FM"
      ctcss_tx_hz: 127.3
      ctcss_rx_hz: 127.3
      notes: "Red Line operations. Source marks licence expired 11/22."

  # Rail heater control (low band, simplex)
  - id: chain_cta_rail_heater
    station_id: stn_cta_wqdw399
    antenna_id: ant_cta_wqdw399
    tx:
      freq_mhz: 44.540
      emission: "16K0F3E"
    mode:
      type: "FM"
      notes: "Low-band rail switch/third-rail heater control. Carrier squelch; telemetry, not voice."

  # ---------------- BUS ----------------
  # West Bus Garages
  - id: chain_cta_bus_west
    station_id: stn_cta_wsav450
    antenna_id: ant_cta_wsav450
    rx:
      freq_mhz: 458.475
    tx:
      freq_mhz: 453.475
      emission: "11K2F3E"
    mode:
      type: "FM"
      notes: "West bus garages. Carrier squelch; carrier/noise/DTMF signalling observed."

  # North Bus Garages
  - id: chain_cta_bus_north
    station_id: stn_cta_wsav451
    antenna_id: ant_cta_wsav451
    rx:
      freq_mhz: 458.575
    tx:
      freq_mhz: 453.575
      emission: "11K2F3E"
    mode:
      type: "FM"
      ctcss_tx_hz: 127.3
      ctcss_rx_hz: 127.3
      notes: "North bus garages. Source questions a possible RTA / Oak Lawn association."

  # Voice Paging / Data
  - id: chain_cta_bus_pg1
    station_id: stn_cta_wsay246
    antenna_id: ant_cta_wsay246
    rx:
      freq_mhz: 458.275
    tx:
      freq_mhz: 453.275
      emission: "11K2F3E"
    mode:
      type: "FM"
      notes: "Voice paging and data. Carrier squelch. Source notes an alternate of 151.4 MHz."

  # Voice Paging
  - id: chain_cta_bus_pg2
    station_id: stn_cta_kls562
    antenna_id: ant_cta_kls562
    rx:
      freq_mhz: 458.325
    tx:
      freq_mhz: 453.325
      emission: "11K2F3E"
    mode:
      type: "FM"
      notes: "Voice paging. Carrier squelch."

  # Rapid Transit Shops (simplex)
  - id: chain_cta_bus_rts
    station_id: stn_cta_wprr940
    antenna_id: ant_cta_wprr940
    tx:
      freq_mhz: 471.6625
      emission: "11K2F3E"
    mode:
      type: "FM"
      ctcss_tx_hz: 127.3
      ctcss_rx_hz: 127.3
      notes: "Rapid Transit Shops, simplex."

assignments:
  - id: asgn_cta_rail_f1
    channel_name: "CTA Rail F-1"
    rf_chain_id: chain_cta_rail_f1
    usage: "repeater"
    authorization_id: auth_cta_expired
  - id: asgn_cta_rail_f2
    channel_name: "CTA Rail F-2"
    rf_chain_id: chain_cta_rail_f2
    usage: "repeater"
    authorization_id: auth_cta_expired
  - id: asgn_cta_rail_f3
    channel_name: "CTA Rail F-3"
    rf_chain_id: chain_cta_rail_f3
    usage: "repeater"
    authorization_id: auth_cta_active
  - id: asgn_cta_rail_f4
    channel_name: "CTA Rail F-4"
    rf_chain_id: chain_cta_rail_f4
    usage: "repeater"
    authorization_id: auth_cta_active
  - id: asgn_cta_rail_f5
    channel_name: "CTA Rail F-5"
    rf_chain_id: chain_cta_rail_f5
    usage: "repeater"
    authorization_id: auth_cta_expired
  - id: asgn_cta_rail_f6
    channel_name: "CTA Rail F-6"
    rf_chain_id: chain_cta_rail_f6
    usage: "repeater"
    authorization_id: auth_cta_expired
  - id: asgn_cta_rail_f7
    channel_name: "CTA Rail F-7"
    rf_chain_id: chain_cta_rail_f7
    usage: "repeater"
    authorization_id: auth_cta_expired
  - id: asgn_cta_rail_f8
    channel_name: "CTA Rail F-8"
    rf_chain_id: chain_cta_rail_f8
    usage: "repeater"
    authorization_id: auth_cta_expired
  - id: asgn_cta_rail_heater
    channel_name: "CTA Rail LB"
    rf_chain_id: chain_cta_rail_heater
    usage: "simplex"
    authorization_id: auth_cta_active
  - id: asgn_cta_bus_west
    channel_name: "CTA Bus W-G"
    rf_chain_id: chain_cta_bus_west
    usage: "repeater"
    authorization_id: auth_cta_active
  - id: asgn_cta_bus_north
    channel_name: "CTA Bus N-G"
    rf_chain_id: chain_cta_bus_north
    usage: "repeater"
    authorization_id: auth_cta_active
  - id: asgn_cta_bus_pg1
    channel_name: "CTA Bus PG1"
    rf_chain_id: chain_cta_bus_pg1
    usage: "repeater"
    authorization_id: auth_cta_active
  - id: asgn_cta_bus_pg2
    channel_name: "CTA Bus PG2"
    rf_chain_id: chain_cta_bus_pg2
    usage: "repeater"
    authorization_id: auth_cta_active
  - id: asgn_cta_bus_rts
    channel_name: "CTA Bus RTS"
    rf_chain_id: chain_cta_bus_rts
    usage: "simplex"
    authorization_id: auth_cta_active

comments:
  - text: |
      Chicago Transit Authority rail and bus conventional channels.

      LICENCE CAVEAT: the source flags that many of these CTA licences have expired and the
      frequencies are now licensed to A-Beep, and explicitly asks for reports on whether they
      are still in use. Rail F-1 (expired 4/23) and F-2, F-5, F-6, F-7, F-8 (all expired 11/22)
      are recorded under a separate authorization (auth_cta_expired) so the uncertainty is
      visible rather than buried. These are good survey targets for the RTL-SDR rig - confirm
      or clear them before treating this set as current.

      Rail line mapping is the useful part for scanning: F-5 Blue/Pink, F-6 Green/Orange,
      F-7 Brown/Purple/Yellow, F-8 Red. F-3 and F-4 are the North and South supervisor
      channels and carry bus supervisor traffic as well as rail.

      Rail F-1 is labelled CPD Transit Alt - a Chicago Police transit channel on a CTA
      licence, distinct from the CPD channels in
      ssrf/systems/US/IL/Cook/Chicago/public_safety/chicago_police_department.yml.

      The bus repeaters use a +5.000 MHz split (453.x -> 458.x). Three of them run carrier
      squelch rather than a tone.

      NOT DUPLICATED HERE: the existing transit_transport.yml already carries CTA 461.575
      and 462.100; chicago_fire_ems_northside.yml already carries CTA Fire on
      460.0625 (203.5 PL). No frequency in this file overlaps either.
      NOTE: 461.825 DMR CC6 was previously attributed to CTA in transit_transport.yml
      (ch_cta_ops2) but is confirmed First Student Skokie Yard per RR aid/10887 —
      removed from that file and now in first_student.yml.

      44.540 MHz is low-band third-rail/switch heater control telemetry, not voice.

      RX-only for the general public per Part 90.