practical wireless số 2010 06

NOW IN ITS 78th YEAR! June 2010 £3.50 ISSN 0141-0857 VHF DXer David Butler G4ASR PW 144MHz Contest All the details you need to enter! Intro to DXing A beginner's guide by Mark Dumpleton 2E0NCG Emerging Technology Chris Lorec G4HCL Practical Way George Dobbs G3RJV In Focus The Cockenzie & Port Seton Amateur Radio Club In Focus VHF DXer: The 5.4m dish antenna at the QTH of Howard Ling G4CCH [...]... http://www.pwcontest.org.uk (Submitting logs using the spreadsheet will really assist the adjudicator!) Files in any other suitable format (plain text is fine Sunday June 13th 2010 Practical Wireless, June 2010 19 The 27th Practical Wireless 144MHz QRP Contest provided each of the items required is separated by a separating character such as a comma or tab) can also be accepted Please don’t mix separators... for the day! G3XFD T he 27th Annual Practical Wireless 144MHz QRP contest takes place on Sunday June 13th 2010 from 0900 to 1600UTC The format of the 144MHz contest is simple, designed to maximise participation from newcomers and keen contesters alike, whilst keeping it a friendly and fun event to take part in For those new to Amateur Radio contests, the Practical Wireless 144MHz QRP contest is a perfect... note photographs cannot be returned and may be used for publication in Practical Wireless or on the www pwcontest.org.uk website If these are not available by the time the entry is submitted, they may be sent later by E-mail or post, to arrive by August 11th 2010 A summary of the results will be published later this year in Practical Wireless 7 Miscellaneous: When operating portable, obtain permission... used by George G3RJV to test the viability of the 5u3L coil in a Hartley based receiver The receiver tuned circuit is formed by a 5u3L coil and the variable capacitor Ct 28 Practical Wireless, June 2010 Please mention Practical Wireless when replying to advertisements KITS & MODULES NEW PRODUCT UPWEY 160m AM/LSB RECEIVER Single conversion superhet receiver for Top Band using a 4 pole cer onversion... information from Dave via E-mail at: dave@zs6mus.org.za Dave Gemmell ZS6AAW on duty in the Wireless Hut’ - which (as it’s made of corrugated iron) – can get very hot in the South African sun! One of the former SAAF Shackleton marine reconnaissance aircraft now preserved at Swartkop Air Force base Practical Wireless, June 2010 13 CALL MAIL ORDER 01908 281705 sales@moonrakerukltd.com Hand-helds Alinco DJ-G7... + R1 150 1W C1 1n Voltmeter - The 2010 Rules The 27th Annual Practical Wireless 144MHz QRP Contest 1 General: The contest is open to all licensed Radio Amateurs, fixed stations or portable, using s.s.b., c.w., a.m or f.m in the 144MHz (2m) band Entries may be from individuals or from groups, clubs, etc The duration will be from 0900 to 1600 UTC on Sunday June 13th 2010 All stations must operate within... Alder Street (off the High Street), Atherton, Practical Wireless, June 2010 Manchester M46 9EY The doors will be open from 11.00am to 3.00pm and admission will be £2.00 (children under 14 free) There will be a free car park, trade stands, a Bring & Buy, club stands, catering with a licensed bar and facilities for the disabled Les Jackson G4HZJ Tel: 01942 8 7063 4 E-mail: g4hzj@ntlworld.com June 6th The... (4-6) 5.3 5u3L 5 15 1 19814 1238 1145 Tuning coil Tuning coil circuit shown in Fig 4(b) 49 Fig 3: A small extract from the supplied data for the (a) Hartley (b) Armstrong 5u3L coil Practical Wireless, June 2010 27 carrying on the practical way of the amplifier is turned up, a nasty howling (oscillation) can occur The feedback from the speaker to the microphone is the cause In the Armstrong circuit a coil... car park Entrance £2 per visitor, £10 per seller’s pitch Advanced bookings (with discount) can be made via the website: www.nadars.org.uk.rally2010.asp Contact: Phill Morris G6EES Tel: (07771) 504738, or via E-mail: rally@nadars.org.uk Practical Wireless, June 2010 11 news & products Ooops! Antenna Workshop An Effective 14MHz Loft Antenna O n page 26 of the May issue of PW, there was a reference in the... MOSFET equiv 4067 3 £2.25 each, P&P £1.00 any quantity SPECTRUM COMMUNICATIONS 12 WEATHERBURY WAY, DORCHESTER, DORSET, DT1 2EF Tel & Fax 01305 262250 E-mail: tony@spectrumcomms.co.uk Web site www.spectrumcomms.co.uk Prices inclusive of postage unless stated Payment by Credit/Debit card, Cheque or Postal Order Cheques or Postal Orders payable to Spectrum Communications Practical Wireless, June 2010 29 Tony . y0 w1 h1" alt="" Practical Wireless June 2010 contents Volume 86. Number 6. Issue 1237. On sale 13 May 2010 Practical Wireless, June 2010 5 Copyright © PW PUBLISHING LTD. 2010. Copyright in. asked Practical Wireless readers’ letters The Star Letter will receive a voucher worth £20 to spend on items from our Book Store or other services offered by Practical Wireless. Practical Wireless, . Norman Crampton M0FZW. E-mail: m0fzw@homecall.co.uk Practical Wireless, June 2010 10 Support For RSGB Spectrum Defence Fund Practical Wireless Newsdesk news & products A comprehensive