Specifications of Shortwave Radios from Various Manufacturers
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The 630 Meter Band
The 630 Meter Band Introduction The 630 meter Amateur Radio band is a frequency band allocated by the International Telecommunication Union (ITU) to the Amateur Service, and ranges from 472 to 479 kHz, or equivalently 625.9 to 635.1 meters wavelength. It was formally allocated to the Amateur Service as part of the Final Acts of the 2012 World Radiocommunication Conference (WRC-12). Once approved by the appropriate national regulatory authority, the band is available on a secondary basis to countries in all ITU regions with the limitation that Amateur stations have a maximum radiated power of 1 Watt effective isotropic radiated power (EIRP). Stations more than 800 km from certain countries (listed below) may be permitted to use 5 Watts EIRP however. The ITU Final Acts took effect 1 January 2013 and after public consultation on all of the ITU allocation changes contained it, the 630 meter band was added to the Canada Table of Frequencies in 2014. Several countries had previously allocated the WRC-12 band to Amateurs domestically. Several other countries had also already authorized temporary allocations or experimental operations on nearby frequencies. The band is in the Medium Frequency (MF) region, within the greater 415–526.5 kHz maritime band. The first International Wireless Telegraph Convention, held in Berlin on November 3, 1906, designated 500 kHz as the maritime international distress frequency. For nearly 100 years, the “600-meter band” (495 to 510 kHz) served as the primary calling and distress frequency for maritime communication, first using spark transmissions, and later CW. In the 1980s a transition began to the Global Maritime Distress Signaling System (GMDSS), which uses UHF communication via satellite. -
New Solar Research Yukon's CKRW Is 50 Uganda
December 2019 Volume 65 No. 7 . New solar research . Yukon’s CKRW is 50 . Uganda: African monitor . Cape Greco goes silent . Radio art sells for $52m . Overseas Russian radio . Oban, Sheigra DXpeditions Hon. President* Bernard Brown, 130 Ashland Road West, Sutton-in-Ashfield, Notts. NG17 2HS Secretary* Herman Boel, Papeveld 3, B-9320 Erembodegem (Aalst), Vlaanderen (Belgium) +32-476-524258 [email protected] Treasurer* Martin Hall, Glackin, 199 Clashmore, Lochinver, Lairg, Sutherland IV27 4JQ 01571-855360 [email protected] MWN General Steve Whitt, Landsvale, High Catton, Yorkshire YO41 1EH Editor* 01759-373704 [email protected] (editorial & stop press news) Membership Paul Crankshaw, 3 North Neuk, Troon, Ayrshire KA10 6TT Secretary 01292-316008 [email protected] (all changes of name or address) MWN Despatch Peter Wells, 9 Hadlow Way, Lancing, Sussex BN15 9DE 01903 851517 [email protected] (printing/ despatch enquiries) Publisher VACANCY [email protected] (all orders for club publications & CDs) MWN Contributing Editors (* = MWC Officer; all addresses are UK unless indicated) DX Loggings Martin Hall, Glackin, 199 Clashmore, Lochinver, Lairg, Sutherland IV27 4JQ 01571-855360 [email protected] Mailbag Herman Boel, Papeveld 3, B-9320 Erembodegem (Aalst), Vlaanderen (Belgium) +32-476-524258 [email protected] Home Front John Williams, 100 Gravel Lane, Hemel Hempstead, Herts HP1 1SB 01442-408567 [email protected] Eurolog John Williams, 100 Gravel Lane, Hemel Hempstead, Herts HP1 1SB World News Ton Timmerman, H. Heijermanspln 10, 2024 JJ Haarlem, The Netherlands [email protected] Beacons/Utility Desk VACANCY [email protected] Central American Tore Larsson, Frejagatan 14A, SE-521 43 Falköping, Sweden Desk +-46-515-13702 fax: 00-46-515-723519 [email protected] S. -
Inside This Issue
News Serving DX’ers since 1933 Volume 82, No. 7●December 29, 2014● (ISSN 0737-1639) Inside this issue . 2 … AM Switch 11 … Domestic DX Digest East 16 … College Sports Networks 5 … Membership Report 14 … International DX Digest 17 … Treasurer’s Report 6 … Domestic DX Digest West 15 … Musings of the Members 18 … Geo Indices/Space Wx Board Announcement: The NRC Board of DecaloMania in Fort Wayne, Indiana, July 10‐12, Directors is pleased to announce the 2015. More details will be forthcoming as our appointment of its newest member to the BoD to host Scott Fybush works them out. fill the vacant seat left by Ken Chatterton after DX Tests: If you want to help arrange tests, his resignation earlier this year. Dave Schmidt, contact Brandon Jordan, the NRC/IRCA Test who has served as Musings of the Members Coordination, at P.O. Box 338, Rossville TN editor for over twenty years and DDXD editor 38066, (901) 592‐9847, and [email protected]. before that, is our newest BoD member. Dave Brandon has set up a web site at also has a keen interest in record collecting and http://dxtests.net/ for the latest test info. And Internet radio (maybe he’ll tell you more in a follow him on Twitter @AMDXTests for the latest Musing soon!). Welcome, Dave! – Paul test info. Swearingen, NRC BoD Chairman. PARI DXpedition: Via the NASWA Journal, DXAS: Fred Vobbe has announced that he Thomas Witherspoon is planning a unique will be stepping down as publisher of the DX DXpedition to the Pisgah Astronomical Research Audio Service after the April 2015 issue. -
AM Loop Antennas AM LOOP ANTENNAS Introduction
AM Loop Antennas AM LOOP ANTENNAS Introduction An AM loop antenna is one of the true marvels of electronics. Requiring no power, it takes advantage of the resonant properties of an inductor and a capacitor connected in parallel to receive weak AM stations. The "loop" part of the antenna is the inductor, and the tuning capacitor makes it resonate at a desired frequency. As a boy in Abilene in 1967, I discovered the basic principle of the loop antenna. By removing a relatively small spiral loop in my five tube table radio, and substituting a much larger loop salvaged from an older radio, I could receive my favorite station - KLIF from Dallas better. I hid the loop in a cardboard holder featuring the logo of a favorite rock band, and enjoyed many hours of good listening. Lacking the mathematical background to understand antenna theory - I could not take the concept to the next phase: designing my own loop. Nevertheless, the spiral loop - combined with the antenna section of the radio's tuning capacitor - formed a very good loop antenna. I understood quite well that the bigger the loop, the more stations I could receive. The schematic diagram of an AM loop antenna is shown below. It consists of an inductive winding, which is supported on a frame, and a variable tuning capacitor that can be salvaged from a junk radio. The inductive winding consists of a primary, which forms a resonant network with the tuning capacitor, and a secondary "sense" winding that can be connected to a radio. In practice, however, the sense winding is not needed if the loop antenna can be placed near the radio - mutual coupling will take place with the antenna in the radio. -
EDXC Conference 2017
50 th EDXC Conference in Tampere Alan Pennington reports from Finland The 2017 European DX Council (EDXC) conference was held in Tampere, Finland between 18 th - 20 th August, hosted by the Finnish DX Association (FDXA) (Suomen DX-Liitto (SDXL) in Finnish). Local FDXA member club is the Tampere DX-listeners club (TreDXK). Both EDXC and TreDXK, were celebrating their 50 th anniversary this year, having been founded in 1967. On 6 th December this year, Finland will also celebrate 100 years of independence from Russia. So lots to celebrate! Helsinki Central railway station. Risto outside FDXA office in Helsinki Those delegates staying in Helsinki on the day before the conference started were kindly invited on a short walking tour of some of Helsinki’s city centre attractions, led by Risto Vähäkainu of the FDXA, which ended with some welcome local refreshments at the FDXA office in Annankatu. The city of Tampere is in southern Finland, a 160km 90-minute express train ride north of the capital, Helsinki. It is sited between two lakes which are linked by the Tammerkoski, a 1km channel of rapids whose power was harnessed by the textile industry in the 19 th century, and whose heritage red brick mills still line its banks. As a result, the city is often compared to Manchester (UK), but today the old industries have gone, and it is a thriving modern technology and university city, the third largest in Finland with a population of around 220,000. The conference venue was the modern Varala Sports Institute (https://varala.fi ), sited in a lakeside forest, 3km from Tampere city centre. -