lisats_logo.gif

The Launch Information Service and
Amateur Television System
(LISATS)

P.O.Box 320583
Cocoa Beach , FL 32932-0583

Launch Information

NOTICE: Anyone who signed up for and
not received a launch witness certificate
from a previous launch
Please contact rhill2004@att.net

A Club of Amateur Radio Operators
Serving the Kennedy Space Center Community
and Visitors

Latest LISATS Newsletter
Newsletter Archive


[Members] [Links] [Launch Operations] [Monday Night Net]
[Files]     [Minutes of Latest Meeting]

Monthly meetings are open to the pulic, and held
The 1st Tuesday of each month at 7pm local
Umpa's Diner
1115 N Courtenay Pkwy
Merritt Island, FL 32953

Known for its NASA, United Launch Alliance, and SpaceX launch countdown coverage on the K4GCC 146.940 MHz 2-Meter FM repeater, this non-profit amateur radio club operates an ATV (Amateur Television) repeater. With the call sign K4ATV, it is located in Cocoa, Florida (near State Road 520 & Clearlake Road intersection) and operates with 439.25 MHz input, and 427.25 MHz output, on cable channels 60 and 58 respectively. It outputs Space Coast rocket launch Video/Audio. Viewers can select video and audio source from a menu using DTMF tones on 144.340 MHz.

The signal can be demodulated by standard NTSC analog TV receivers. For TV's not cable ready, downconverters are used to shift the signal to TV Channel 3 output to a TV set. For cable-ready sets, the repeater's video carrier output of 427.25 MHz is the same as Cable TV's channel 58. A cable-ready TV receiver, tuned to cable channel 58, with a gain antenna connected to its input (vertically polarized), can receive the repeater in central Brevard with broadcast station signal levels. Individual amateur TV stations transmitting on 439.25 MHz, can be received using cable channel 60.

Several manufacturers produce transmitter-downconverter units and these units, with a camera, low-loss coax and 6-12 db gain antenna, permit 20 mile range operation. Mobile units are operational in Brevard County, and the county's Emergency Management officials have equipped the Emergency Operations Center (EOC) in Rockledge with an ATV transmit and receiving station with video and audio into or from the EOC's video monitors, cameras, and microphones. The BEARS1 Emergency vehicle also has full ATV capability and a portable 2 GHz live video camera.

The LISATS repeater uses broadband UHF antennas (vertically polarized). Received and transmitted signals are routed through 7-pole bandpass filters. The received signal goes to a cable TV demodulator (receiver) which routes video and audio to the repeater controller, which contains the modal switching. The controller senses NTSC horizontal sync pulses in the received video and keys up the transmitter. The controller provides DTMF-controlled switching of 5 video and 4 audio sources. Video is reconditioned to NTSC configuration.

The NASA TV and United Launch Alliance downlinks are provided by a digital free-to-air satellite receiver from a two 10 ft. dishes. Space X launch video is provided via their web site streaming webcast. A control receiver on 144.340 MHz permits DTMF control by radio. A video overlay circuit keeps the words K4ATV and LISATS on all screens.

A cable TV modulator drives a linear amplifier to 50 watts.

A 10 dbd collinear antenna radiates the signal from 265 feet on the Ezycom, Inc. Broadcast Court tower site near SR520 and Clearlake Road. The repeater ID's in video and CW, every ten minutes for 20 seconds. Recently published Expendable launches are also covered whether from satellite signal rebroadcast or from LISATS mobile amateurs internet webcasts.

The LISATS K4ATV/R ATV Video repeater can be controlled by the following DTMF (Touch Tone) codes transmitted on 144.340 MHz in the central Brevard area (Control operators monitor 144.340 frequently):



LISATS K4ATV
Repeater Command List
July 24, 2016
       
      The following DTMF tones are sent on 144.34 MHz simplex. Audio inputs can be mixed (listen to up to all 4 inputs at the same time).

FunctionCommand
Continuous On Mode
      Transmitter On 00*
      Transmitter Off 00#
      Select 434 MHz Video In 1
      Select C-Band TV Video In 2
      Select KU Video Video In 3
      Select Computer Video In 4
      Select Color Bars Video In 5
 
      Follow commands below with * to turn ON, # to turn OFF.
      Select 434 MHz Audio In *A1 (on) | #A1 (off)
      Select C-Band Audio In *A2 (on) | #A2 (off)
      Select KU-Band Audio In *A3 (on) | #A3 (off)
      Select 146.940 MHz K4GCC Audio In *A4 (on) | #A4 (off)
  The "A" referred to above is the topmost of the ABCD keys on a 16 Key touch-tone pad. Not all keypads have this column of keys.

Repeater Mode
Follow Commands below with * to turn ON, # to turn OFF
      Note: Audio is switched with Video.
Select Video input that keys Transmitter 01 through 04
       
      Operates with Video 1 priority highest
      Beacon Mode (is enabled)
      The repeater will transmit the Video ID (K4ATV with color bars) and audio Morse Code of the call sign. After 20 seconds the repeater turns off. This repeats every 10 minutes. Therefore a video and audio signal is available for users to check reception, make antenna adjustments, etc.

Net Control Protocol




LISATS is a USTVS affiliated Club.
73's.

[Members] [Links] [Launch Operations]