Television practices

Question 1

What is the function of the Vertical Interval Signaling (VIS) code sent as part of SSTV

Answer 1

To identify the SSTV mode being used

Question 2

How are analog SSTV images transmitted on HF bands?

Answer 2

Varying tone frequencies using SINGLE SIDEBAND

Question 3

How many lines are in each frame of slow-scan color TV picture

Answer 3

128 or 256

Question 4

What aspect of slow-scan encodes the BRIGHTNESS

Answer 4

Tone Frequency

Question 5

What signals SSTV receiving equipment to begin a NEW LINE

Answer 5

specific tone FREQUENCIES

Question 6

What is the bandwidth of a slow-scan TV signal?

Answer 6

3 kHz (not much)

Question 7

What is BLANKING in a video signal?

Answer 7

Turning off the SCANNING BEAM while it is TRAVELLING

Question 8

Advantage of vestigial SIDEBAND for fast-scan TV

Answer 8

SIDEBAND reduces BANDWIDTH

Question 9

What is vestigal sideband MODULATION

Answer 9

Amplitude Modulation

Question 10

What is the name of the signal component that carried COLOR information in NTSC?

Answer 10

CHROMA

Question 11

Common method of accompanying audio with fast-scan television?

Answer 11

ALL OF THE ABOVE: sub-carrier, separate audio link and FM of the video carrier

Question 12

What hardware is needed to decode SSTV using DRM

Answer 12

NO OTHER HARDWARE IS NEEDED

Question 13

What is acceptable bandwidth for DRM based voice or SSTV?

Answer 13

3 kHz

Question 14

Frequency likely to find FM ATV transmissions

Answer 14

1225 MHz (the only 4 digit answer)

Question 15

What special operating frequency restrictions are imposed on slow scan TV?

Answer 15

restricted to PHONE BAND segments