UTFORSKABIBLIOTEK
Teknologi och spel
CQ Amateur Radio

CQ Amateur Radio May 2017

CQ is the magazine for active hams, with a focus on the practical. Every article is clearly written and aimed at involving you, the reader...whether it's a story of operating from some exotic location, an article to deepen your understanding of ham radio science and technology, or a fun-to-build project that will have practical use in your ham shack. Join us on our monthly journey through the broad and varied landscape of the world's most fascinating hobby!

Land:
United States
Språk:
English
Utgivare:
CQ Communications, Inc.
Antal:
Monthly
Läs mer
KÖP NUMMER
55,47 kr(Inkl. moms)
PRENUMERERA
277,80 kr(Inkl. moms)
12 Nummer

i detta nummer

7 min
ham radio news

FLASH! FCC Approves New MF/LF Ham Bands Hams in the U.S. will soon have two new bands on which to operate, experiment, and contribute to the collective knowledge of “the radio art.” In a Report and Order issued on March 30, the FCC approved creation of secondary amateur allocations at 135.7-137.8 kHz (2200 meters) and 472-479 kHz (630 meters), the first amateur bands with wavelengths above 200 meters since the dawn of radio regulation. The new bands come with lots of strings attached, since they will be shared with “PLC” systems used by electric utilities to control the nation’s power grid. Hams will be limited to fixed station operation, antennas no higher than 60 meters (196 feet) above ground and radiated power limits of 1 watt effective isotropic radiated power (EIRP) on…

5 min
zero bias – a cq editorial

“It’s More Fun When You Make It” Slime. Nope, no political discussions this month … the slime in this case was real, and it was the subject of a recent morning TV news show segment that caught my eye. The segment featured four young girls — probably in fifth or sixth grade — mixing up nice gooey slime using a combination of Elmer’s® glue, borax, and a couple of other ingredients. As it started to take shape, one of the co-hosts interjected, “Have you ever heard of Silly Putty®?” “Yes,” answered one of girls as she mixed up her glob of goo. “It’s pretty much the same stuff,” the host said. “Why don’t you just buy it?” “It’s more fun when you make it,” she replied. About a week earlier, I spent some time with…

20 min
long path: connecting a yaesu radio to the pilgrims, henry viii, and the shipwreck of de liefde

Travelers passing through Tokyo’s main railway station, just a few blocks from the Imperial Palace, may notice the “Yaesu” exit. Yaesu (Photo A) is the name of the bustling economic neighborhood just outside the eastern side of the building. Tokyo’s largest shopping mall can be found in the underground plaza running beneath Yaesu Avenue, starting at the train station. What does this area have to do with modern Yaesu radios, New York City’s Wall Street, and 1960s actor Richard Chamberlain? Read on and discover some things you might not know. Yaesu: A Japanese Mispronunciation of Jan Joosten Yaesu is the modern western spelling of “Yan Yazoo,” the Japanese pronunciation of the name of a 16th century Dutchman: Jan Joosten (Photo B). (The Dutch pronounce their J’s the way the English pronounce their…

12 min
results of the 2016 cq world wide dx cw contest

After the “worst bands to date” headline for the 2016 SSB contest article, it was with great anticipation that we headed into the CW weekend. Would things be even worse? According to the numbers, CW saw improved conditions and more activity. Whew! We are taking a departure from the usual contest story this time. If you are looking for the scores, please see the rest of the article (line scores, top scores, table of winners, etc.). CQWW has always drawn the most activity among international contests. If you look back a decade or so, CQWW included the nickname “The Contest.” Yes, CQWW is still “The” contest because every year it is The place to be for contesters. And CQWW CW in 2016 proved to be yet another fun contest for global participants. Join…

6 min
2016 wwdx cw trophy winners and donors

SINGLE OPERATOR World ZF2MJ (Opr.: Dan Craig, N6MJ) Donor: Vibroplex World – Low Power V26K (Opr.: Bud Trench, AA3B) Donor: Slovenia Contest Club World – QRP Doug Zweibel, KR2Q Donor: Bob Evans, K5WA World Assisted P4$$C (Opr.: Alex Tkatch, KU1CW) Donor: Robert McGwier, N4HY World – Assisted Low Power P4ØW (Opr.: John Crovelli, W2GD) Donor: Lyubomir “Leo” Slavov, OR2F World – Assisted QRP Karel Karmasin, OK2FD Donor: Steve “Sid” Caesar, NH7C U.S.A. Greg Cronin, W1KM Donor: Frankford Radio Club U.S.A. – Low Power K3CR (Opr.: Alex Avramov, LZ4AX) Donor: North Coast Contesters U.S.A. – QRP Frank Letton, W6JTI* Donor: W3ZZ Memorial (Andy Blank, N2NT) U.S.A. – Assisted Randy Thompson, K5ZD/1 Donor: John Rodgers, WE3C U.S.A. – Assisted Low Power Ken Low, KE3X Donor: LA9Z/LN9Z Leia Contest Club U.S.A. Zone 3 Bob Wolbert, K6XX Donor: Arizona Outlaws Contest Club U.S.A. Zone 4 Mike Wetzel,…

3 min
sherlock investigates: “a case of (transmitter) identity”

Your local repeater is having interference problems. The jammer, of course, never identifies. The club’s technical committee suspects the source is a regular user but has no proof. They’ve tried DFing (direction-finding) the offending station, but have concluded only that it is mobile when the interference occurs, since it is never in the same place twice. What can you do? Sherlock to the rescue! “Elementary,” says our fabled sleuth. “Do what all good detectives do … use fingerprints.” Fingerprints? From a radio? You bet. Sherlock explains: The signals intelligence method of “fingerprinting” an FM radio transmission has been used for a long time and is very simple. Here is how it works: When an FM transmitter is keyed up, the waveform of the radiated signal varies depending on what type of radio it is.…