Extra Class

Which of the following techniques is used by digital satellites to relay messages?

In digital television, what does a coding rate of 3/4 mean?

How many horizontal lines make up a fast-scan (NTSC) television frame?

How is an interlaced scanning pattern generated in a fast-scan (NTSC) television system?

How is color information sent in analog SSTV?

What is vestigial sideband modulation?

Which types of modulation are used for amateur television DVB-T signals?

What technique allows commercial analog TV receivers to be used for fast-scan TV operations on the 70-centimeter band?

What kind of receiver can be used to receive and decode SSTV using the Digital Radio Mondiale (DRM) protocol?

What is the function of the vertical interval signaling (VIS) code sent as part of an SSTV transmission?

What indicator is required to be used by US-licensed operators when operating a station via remote control and the remote transmitter is located in the US?

Which of the following file formats is used for exchanging amateur radio log data?

From which of the following bands is amateur radio contesting generally excluded?

Which of the following frequencies can be used for amateur radio mesh networks?

What is the function of a DX QSL Manager?

During a VHF/UHF contest, in which band segment would you expect to find the highest level of SSB or CW activity?

What is the Cabrillo format?

Which of the following contacts may be confirmed through the Logbook of The World (LoTW)?

What type of equipment is commonly used to implement an amateur radio mesh network?

Why do DX stations often transmit and receive on different frequencies?