Amateur Television

1
Amateur Television
2
Glossary

• Frame
• Single Picture
• Field
• ½ Picture
• Interlaced
• Draws ½ Picture then draws the second half

3
Glossary

• Interlace

4
Broadcast TV

• Bandwidth
• 6MHz

5
Broadcast TV

• 525 Lines per frame
• 262 ½ Lines per field
• 30 Frames per second
• Full motion video

6
Amateur Television

• Types of ATV
• SSTV
• Slow Scan Television
• FSTV
• Fast Scan Television

7
Slow Scan TV

• Single frame of video
• Scan convert a frame to audio then transmit the
  audio
• Recent happenings
• Web Cams and Video capture cheap
• Use sound card to generate tones
• Rig Blaster, BuxComm interfaces
• Freeware/Shareware software

8
Fast Scan TV

• Usable Frequencies
• 70cm
• First ham band that is wide enough to allow full
  6MHz bandwidth
• Standard Frequencies
• 421.25 MHz
• 426.25 MHz
• 427.25 MHz
• 434.00 MHz
• 439.25 MHz

9
Fast Scan TV

• Usable Frequencies
• 33cm 902 928 MHz
• 23cm 1240-1300 MHz
• 13cm 2390 2450 MHz

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70cm FS ATV

• Station Requirements
• Receive
• Television Receiver
• Channel 57 (421.25MHz)
• Channel 60 (439.25MHz)
• Down Converter Tuner

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70cm FS ATV

• Station Requirements
• Transmit
• Video Source
• Camcorder
• Camera
• Audio Source
• Microphone
• Transmitter
• Off the Shelf
• Commercial Equipment
• Home Brew

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70cm FS ATV

• Station Requirements
• Antenna
• Horizontal Polarization
• Operator Requirements
• Technician Class

13
70cm FS ATV

• Off the Shelf Equipment
• PC Electronics
• TC70-20S
• Synthesized 4 Channel Transmitter
• 20 W Output
• Built in Tuner/Down Converter
• Video, Audio, MIC, and PTL Inputs
• 549

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70cm FS ATV

• Commercial Equipment
• Cable Modulators
• Need 25 KHz steps
• Blonder Tongue (Agile Modulator)
• Video, Audio Inputs
• Low Power Output
• Will require an amplifier
• Typically available on eBay
• Running around 50 last year
• Significantly higher recently

15
70cm FS ATV

• Home Brew Equipment
• PC Electronics
• Individual pieces
• Power Amps
• Modulators
• Down Converter
• 4ATV.com
• 13cm and 23cm equipment
• MFJ
• Micro ATV

16
70cm FS ATV

• Transmission Distance (Miles)

17
70cm FS ATV

• Local Usage
• Repeaters
• WA2PJP/R
• Located on Bald Hill in Selden
• 434.00MHz Input 421.25MHz Output
• Talkback 144.34MHz or 144.37 MHz
• W1NRE/R
• Located in Southern CT.
• 426.25MHz Input 439.25MHz Output
• Talkback 144.34MHz
• Currently Off the Air
• Power Problems

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70cm FS ATV

• Local Usage
• Operators
• WA2PJP Joe (Wednesday 8PM)
• WA2FNQ Jerry (Wednesday 8PM)
• W1CTC Bob (Wednesday 8PM)
• W2OTA Mike (Nightly 7PM)

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ATV Links

• PC Electronics
• www.hamtv.com
• ATV Research
• www.atvreasearch.com
• Directive Systems
• Antennas
• www.directivesystems.com
• www.icircuits.com

20
ATV Links

• Intuitive Circuits
• Video Overlays, Character Generators
• www.icircuits.com
• Connecticut Long Island ATV
• www.ctliatv.org
• Southern CT Amateur Radio Assn
• www.wa2fnq.hamradios.com/scara.htm