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ATCO REPEATER TECHNICAL DATA SUMMARY

Location:

Downtown Columbus, Ohio

Coordinates:

82 degrees, 59 minutes, 53 seconds (longitude), 39 degrees, 57 minutes, 45 seconds (latitude)

Elevation:

650 feet (48 floors) above average street level (1460 feet above sea level)

TV Transmitters:

  • 423 MHz DVB-T digital modulation (BW=2 MHz., 
  • 427.25 MHz AM modulation
  • 1258 MHz FM modulation
  • 1268 MHz DVB-S QPSK digital modulation
  • 10.350 GHz FM modulation

(Multiple filters in output line of all transmitters)

Transmitter Output Power:

  • 423 MHz: 5 watts digital average
  • 427.25 MHz: 50 watts average 100 watts sync tip
  • 1268 MHz: 15 watts digital average
  • 1258 MHz: 50 watts continuous
  • 10.350 GHz: 1 watt continuous

Link transmitter:

  • 446.350 MHz 5 watts NBFM 5 kHz audio

Identification:

427 MHz and 1258 MHz  transmitters identify in video every 10 minutes when there are active transmissions being repeated and every 30 minutes by the bulletin board from WB8CJW's QTH with "ATCO" and "WR8ATV".

423 MHz, 1268 MHz and 10.35 GHz - Continuous transmission of ATCO and WR8ATV with or without input signal present.  17 video screens are continuously sequenced providing identification and test video.

Transmit antennas:

  • 423 MHz - Lindsay 4 bay 5dBd gain horizontally polarized
  • 427.25 MHz - Dual slot horizontally polarized "omni" 7 dBd gain major lobe east/west, 5db gain north/south
  • 1258 MHz - Diamond vertically polarized 12 dBd gain omni (Analog ATV)
  • 1268 MHz - Diamond vertically polarized 12 dBd gain omni (Digital DVB-S ATV)
  • 10.350 GHz - Commercial 40 slot waveguide horizontally polarized 16dBd gain omni

Receivers:

  • 147.48 MHz - F1 audio input with touch tone control
  • 438 MHz DVB-T digital (shared with the 439.25 MHz receiver) 
  • 439.25 MHz - A5 video input with FM subcarrier audio (lower sideband)
  • 449.975 MHz - F1 audio input aux touch tone control (An input here generates an output on 446.350.)
  • 1288 MHz - DVB-S digital (digital input fed direct to 1268 MHz digital output channel 2)
  • 1288 MHz - F5 analog video input (analog and digital receivers share a common antenna).
  • 10.450 GHz - F5 video input

Receive antennas:

  • 147.48 MHz - Vertically polararized Diamond 6dBd dual band (also used for 446.350 MHz link output)
  • 423 MHz - Horizontally polarized Lindsay 4 bay antenna 5 dBd gain.
  • 439.25 MHz - Horizontally polarized dual slot 7 dBd gain major lobe west
  • 1288 MHz - Diamond vertically polarized 12 dBd gain omni
  • 10.450 Ghz - Commercial 40 slot waveguide horizontally polarized 16 dBd gain omni

Input control:

Touch Tone Result (if third digit is * function turns ON, if it is # function turns OFF)

00* transmitters ON (enter manual mode - keeps transmitters on till 00# sequence is pressed)

00# transmitters OFF (exit manual mode and return to auto scan mode)

264 Select Channel 4 Doppler radar. (Stays up for 5 minutes) Select # to shut down before timeout.

Manual mode functions:

  • 00* then 1 for Ch. 1 To view 439.25 receiver
  • 00* then 2 for Ch. 2 To view 1288 digital receiver
  • 00* then 3 for Ch. 3 To view 1288 analog receiver
  • 00* then 4 for Ch. 4 Selects auxillary 4 channel video board for room camera, 10.45 GHz receiver + 2 unused channels
  • 00* then 5 for Ch. 5 Select video ID (17 video identification screens are cycled)
  • 01* or 01# Channel 1439.25 MHz scan enable (hit 01* to scan this receive channel and 01# to disable it)
  • 02* or 02# Channel 2 1288 MHz digital scan enable
  • 03* or 03# Channel 3 1288 MHz FM scan enable
  • 04* or 04# Channel 4  Scan enable auxillary 4 channel video board for room camera, 10.45 GHz receiver.
  • C0* or C0# Beacon mode – transmit ID for twenty seconds every ten minutes (Always disabled)
  • C1* or C1#   (Not used)
  • C2* or C2#   (Not used)