{"id":5747,"date":"2011-04-12T19:27:22","date_gmt":"2011-04-13T01:27:22","guid":{"rendered":"http:\/\/ishmaels.net\/blog\/?p=5747"},"modified":"2011-04-12T19:27:22","modified_gmt":"2011-04-13T01:27:22","slug":"a-new-ham-radio-quiz-on-the-arrl-site","status":"publish","type":"post","link":"https:\/\/www.ishmaels.net\/blog\/2011\/04\/12\/a-new-ham-radio-quiz-on-the-arrl-site\/","title":{"rendered":"A new Ham Radio Quiz on the ARRL site."},"content":{"rendered":"

N0AX does a great job on these \u2013 check this one out\u2026  Amateur Radio Quiz: Uda Thunk It?<\/a><\/h4>\n

 <\/p>\n

Also in the Ham<\/strong> reading today \u2013 this is another great idea put into practice\u2026 <\/p>\n

Tell Your Ham Radio Stories on HamRadioStoryProject.Com<\/a>  so -  Go tell your story..<\/a><\/h3>\n

WD0AJG<\/p>\n

04\/11\/2011<\/p>\n

By H. Ward Silver, N0AX
n0ax@arrl.net<\/a><\/p>\n

The Yagi-Uda array, best known as \u201cthe Yagi,\u201d is in its ninth decade of wireless service. Arguably the most useful antenna design ever devised beyond the dipole, Yagis are found everywhere in Amateur Radio — from the low HF bands<\/a> tomicrowaves<\/a>. Why not swing your beam in the direction of this quiz<\/strong> and see if it \u201cpeaks\u201d your interest?<\/i><\/p>\n

1) The most common feed point impedance for a Yagi\u2019s driven element is _______________ 50 ohms.
a. lower than
b. equal to
c. higher than
d. the complex conjugate of<\/p>\n

2) Which of the following balanced feed point matching systems was adapted to create the gamma match?
a. Hairpin
b. Delta
c. T
d. Link<\/p>\n

3) In a multiband Yagi that uses traps, what function is performed by the traps?
a. Changing the element\u2019s electrical length
b. Increasing gain
c. Decreasing SWR
d. Increasing front-to-back ratio<\/p>\n

4) The Yagi antenna is what type of array?
a. Phased
b. Broadside
c. Curtain
d. Parasitic<\/p>\n

5) Which of the following matching systems requires the driven element of a Yagi to be insulated from the boom?
a. Alpha
b. Gamma
c. Phi
d. Beta<\/p>\n

6) The Yagi\u2019s radiation pattern is best characterized as which of the following?
a. End fire
b. Omnidirectional
c. Isotropic
d. Cardioid<\/p>\n

7) Which design parameter has the strongest effect on Yagi gain?
a. Driven element impedance
b. Number of reflectors
c. Boom length
d. Trap Q<\/p>\n

8) In a 2 element Yagi design, which configuration offers the highest gain?
a. Driven element and a director
b. Driven element and a reflector
c. Both have the same maximum gain
d. Yagis need at least three elements to function properly<\/p>\n

9) The impedance of a Yagi\u2019s driven element is designed to be _______________.
a. Purely resistive
b. Slightly inductive
c. Slightly capacitive
d. Purely reactive<\/p>\n

10) Mutual coupling between elements in a Yagi results in which of the following?
a. Pattern distortion
b. Ground gain
c. Re-radiation
d. Flat SWR<\/p>\n

Bonus Question<\/i><\/b>: Although Professor Uda did most of the research in developing the antenna, why is Professor Yagi<\/strong> most often associated with the design?<\/p>\n

<\/b><\/p>\n

Answers<\/b>:<\/p>\n

1) a — usually less than 30 ohms
2) c — The gamma match is essentially half the T match.
3) a — The traps act as switches to isolate sections of the elements.
4) d — Mutual coupling between elements creates directivity.
5) d \u2013 This is also known as the hairpin match.
6) a — The maximum direction of radiation is along the axis of the antenna.
7) c
8) b — The driven element\/reflector combination can achieve about 1 dB more gain.
9) a
10) c — Re-radiation with the proper phase is the basis of the Yagi design.<\/p>\n

Bonus<\/i><\/b>: Professor Yagi<\/strong> presented the initial technical papers in English outside Japan, so he became the public face of the new antenna.<\/p>\n","protected":false},"excerpt":{"rendered":"

N0AX does a great job on these \u2013 check this one out\u2026  Amateur Radio Quiz: Uda Thunk It? <\/p>\n

 <\/p>\n

Also in the Ham reading today \u2013 this is another great idea put into practice\u2026 <\/p>\n

Tell Your Ham Radio Stories on HamRadioStoryProject.Com  so -  Go tell your story.. <\/p>\n

WD0AJG<\/p>\n

04\/11\/2011<\/p>\n

By H. Ward Silver, N0AX n0ax@arrl.net<\/p>\n

The Yagi-Uda array, best known as \u201cthe Yagi,\u201d is in its ninth decade of wireless service. Arguably the most useful antenna design ever devised beyond the dipole, Yagis are found everywhere in Amateur Radio — from the low HF bands tomicrowaves. Why not swing your beam in the direction of this quiz and see if it \u201cpeaks\u201d your interest?<\/p>\n

1) The most common feed point impedance for a Yagi\u2019s <\/p>\n

“And Now the Rest of the Story – “A new Ham Radio Quiz on the ARRL site.<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[1],"tags":[15],"class_list":["post-5747","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-hf","odd"],"yoast_head":"\nA new Ham Radio Quiz on the ARRL site. - And That was How it Went<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ishmaels.net\/blog\/2011\/04\/12\/a-new-ham-radio-quiz-on-the-arrl-site\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"A new Ham Radio Quiz on the ARRL site. - And That was How it Went\" \/>\n<meta property=\"og:description\" content=\"N0AX does a great job on these \u2013 check this one out\u2026  Amateur Radio Quiz: Uda Thunk It?   Also in the Ham reading today \u2013 this is another great idea put into practice\u2026 Tell Your Ham Radio Stories on HamRadioStoryProject.Com  so -  Go tell your story.. WD0AJG 04\/11\/2011 By H. Ward Silver, N0AX n0ax@arrl.net The Yagi-Uda array, best known as \u201cthe Yagi,\u201d is in its ninth decade of wireless service. Arguably the most useful antenna design ever devised beyond the dipole, Yagis are found everywhere in Amateur Radio — from the low HF bands tomicrowaves. 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Ward Silver, N0AX n0ax@arrl.netThe last quiz took a long look in the rear-view mirror. Let\u2019s turn around\u2026","rel":"","context":"In "Hobbies"","block_context":{"text":"Hobbies","link":"https:\/\/www.ishmaels.net\/blog\/category\/hobbies\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2928,"url":"https:\/\/www.ishmaels.net\/blog\/2010\/10\/16\/arrl-page-repost-amateur-radio-quiz-cell-a-bration\/","url_meta":{"origin":5747,"position":2},"title":"ARRL page repost \u2013 Amateur Radio Quiz: Cell-a-bration!","author":"wd0ajg","date":"October 16, 2010","format":false,"excerpt":"Here is another great quiz from the ARRL - NEW web site. \u00a0- WD0AJGAmateur Radio Quiz: Cell-a-bration!TAGS:\u00a0ham radio,\u00a0Leyden jar,\u00a0ward silver10\/16\/2010By H. Ward Silver, N0AX n0ax@arrl.netI just finished reading\u00a0The Battery -- How Portable Power Sparked a Technological Revolution\u00a0by Henry Schlesinger and found it a very interesting read. It\u2019s not too technical,\u2026","rel":"","context":"In "Hobbies"","block_context":{"text":"Hobbies","link":"https:\/\/www.ishmaels.net\/blog\/category\/hobbies\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":5091,"url":"https:\/\/www.ishmaels.net\/blog\/2011\/02\/27\/amateur-radio-quiz-polar-pursuits\/","url_meta":{"origin":5747,"position":3},"title":"Amateur Radio Quiz: Polar Pursuits","author":"wd0ajg","date":"February 27, 2011","format":false,"excerpt":"From the ARRL\u00a0 this stuff is just cool (pun intended)! TAGS: Antarctica, bonus question, reunion island, South Africa, South America, ward silver 02\/24\/2011 By H. Ward Silver, N0AX n0ax@arrl.net The VP8ORK DXpedition has just concluded, with the Braveheart sailing back into Ushuaia, Argentina -- all hands safe and sound after\u2026","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":3679,"url":"https:\/\/www.ishmaels.net\/blog\/2010\/12\/12\/arrl-new-ham-radio-quiz\/","url_meta":{"origin":5747,"position":4},"title":"ARRL \u2013 New Ham Radio Quiz","author":"wd0ajg","date":"December 12, 2010","format":false,"excerpt":"Amateur Radio Quiz: For Auld Acquaintance TAGS: 160 meters, 80 meters, air force, arrl, arrl hq, clipperton island, DXCC, dxcc entity, ham radio, hiram percy maxim, solar cycle, Top Band, w1aw 12\/06\/2010 By H. Ward Silver n0ax@arrl.net Here at the end of the year, it\u2019s customary to remember those who\u2026","rel":"","context":"In "Hobbies"","block_context":{"text":"Hobbies","link":"https:\/\/www.ishmaels.net\/blog\/category\/hobbies\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":4650,"url":"https:\/\/www.ishmaels.net\/blog\/2011\/01\/22\/amateur-radio-quiz-the-year-in-review-from-arrl-page\/","url_meta":{"origin":5747,"position":5},"title":"Amateur Radio Quiz: The Year in Review from ARRL page","author":"wd0ajg","date":"January 22, 2011","format":false,"excerpt":"Amateur Radio Quiz: The Year in Review TAGS: 60 meters, amateur radio, american red cross, arrl, arrl contest, ARRL International DX, arrl letter,natural disaster, school club roundup, ward silver, weather season 01\/22\/2011 By H. Ward Silver, N0AX n0ax@arrl.net What happened last year in Amateur Radio? Sometimes it\u2019s easier to remember\u2026","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.ishmaels.net\/blog\/wp-json\/wp\/v2\/posts\/5747","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ishmaels.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ishmaels.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ishmaels.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ishmaels.net\/blog\/wp-json\/wp\/v2\/comments?post=5747"}],"version-history":[{"count":0,"href":"https:\/\/www.ishmaels.net\/blog\/wp-json\/wp\/v2\/posts\/5747\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.ishmaels.net\/blog\/wp-json\/wp\/v2\/media?parent=5747"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ishmaels.net\/blog\/wp-json\/wp\/v2\/categories?post=5747"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ishmaels.net\/blog\/wp-json\/wp\/v2\/tags?post=5747"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}