676: What is the term for a repeater that transmits on the same frequency it receives on?

677: Who was Nikola Tesla?    

678: How far does a radio signal travel in 1 nanosecond?  

679: How many amateur stations in Sweden have the prefix SI?

680: Which prefix is used by Swedish military amateur stations?  

681: Is the Swedish king, Carl XVI Gustaf, a member of SSA? (SSA is the swedish equivalent to ARRL)  

682: What famous rock star is an Amateur Radio Operator?  

683: How young was the youngest Amateur Radio Operator?    

684: What is a "Smith Chart"?

685: What do you call the new Technician license after the licensee has passed the 5-wpm. Morse Code Test?

686: What was one of the materials used in the development of the first "coherers"?  

687: The first AM style transmission from a radio transmitter was made from

688: The popular Heathkit 144 MHZ transceiver marketed during the 1960's and early 1970's was the

689: What company(ies) competed with Heathkit in the late 1960's-early 1970's as a maker of Amateur Radio kits?

690: During the Viet Nam war era, what was Senator Barry Goldwater's Air Force MARS callsign?  

691: Who made the only stand-alone 80 to 10 meter kilowatt transceiver for amateur use?  

692: Besides the Q code, what other morse-style brevity code did military radio operators often utilize in WWII?

693: What was advertised as the first amateur radio AM repeater in the San Francisco Bay area, input 146.6, output 145.1?

694: A 7AG7 is what kind of electron tube?

695: 5U4GB refers to

696: During Armed Forces Day cross band amateur radio/ military station operations, if you worked NPG, it was transmitting from

697: The common name for a Wohllenweber HF/DF antenna is

698: The first amateur radio repeater in the Los Angeles Area was:  

699: The Heathkit companion 6 meter AM transceiver to its popular "Two'er" was called the    

700: The original "Citizens' Radio Service," carved out of the old 11 meter ham band, had how many channels?