651: Approximately how many times can a Nickel Cadmium (NiCad) battery be recharged?    

652: In what year did the Federal Communications Commission (FCC) authorize amateur radio spread spectrum communications?

653: Full membership in the American Radio Relay League (ARRL) is only available to licensed radio amateurs.

654: A "Wien-bridge" is a type of _____.

655: RTTY Operation uses the ASCII code for exchanging data.

656: OCXO's and TCXO's often find use in what devices?

657: Unijunction transistors (UJT's) are often used in simple oscillator circuits. What characteristic of a transistor defines it as 'Unijunction?'

658: A type of oscillator, using a hybrid of design techniques of both Armstrong and Colpitts types, exists and has been dubbed the 'Armpitt.'

659: What year did the FCC take the general written test off of the novice license test leaving just the novice written and 5 wpm code?

660: Pulse Code Modulation (PCM) used in telephony is based on the "sampling theorem" developed by _____________.

661: The theories of James Clerk Maxwell on the existence of electromagnetic radiation were experimentally confirmed by _____?

662: The frequency at which a power pentode's screen capacitance and lead inductance are in resonance is called:

663: Which circuit component is typically operated in its reverse breakdown region?

664: Bleeder resistors are typically found installed across the leads of which high-voltage power supply components?

665: A sine wave mixed with the sum of all its odd ordered harmonics is called a:  

666: "Thermionic Emission" refers to?

667: Which of the following country singers holds a Novice class license?  

668: U.K. Novices are limited to?  

669: Where was WWV located before it was moved to Fort Collins, Colorado?

670: What was WWV's callsign before it was moved to Colorado from Maryland?

671: What year did WWV move to Fort Collins, Colorado?

672: When Samuel Morse developed a system of dots and dashes (the Morse Code), where did he find out which letters were used more often than others?        

673: Which of the following systems of code is not used in modern radio communications?  

674: Along with time and weather data, WWV also broadcasts a propagation forecast each hour that is critical to Amateur Radio.

675: Which of the following indices is a function of geomagnetic field conditions that affect Northern Hemisphere propagation?