practical wireless số 2010 07

NOW IN ITS 78th YEAR! July 2010 £3.50 ISSN 0141-0857 I-Pro Traveller Antenna Antenna Design by Carl Kidd G4GTW Pracc Way s... erm t Grg Ds G3RJV Buyng S n-hn t Crs Lr G4HCL CTCSS Project Build a Practical CTCSS Tone Encoder Win A Tennamast Telescopic Mast Worth £460! Atn Wrho t Dvi Btlr G4ASR Part 1 of a 2 part competition [...]... Intermediate course.” Further details about the Horndean & District ARC From: Stuart Swain G0FYX 40 Parkside Havant Hampshire PO9 3PL E-mail g0fyx@msn.com Practical Wireless, July 2010 Free Competition! Win A Tennamast Adaptamast Worth £460! Practical Wireless, July 2010 Focus On Tennamast & Its Personalities Tennamast (Scotland) Ltd, was orginally set up in 1986 and operated by Mechanical Engineer Norrie GM4VHZ... for the disabled would like your event to be mentioned at 10.00am and admission will be £1.50 here www.hamradio-friedrichshafen.de/ham-en www.cornishamateurradioclub.org.uk 22 Practical Wireless, July 2010 Please mention Practical Wireless when replying to advertisements KITS & MODULES NEW TRIBAND ACTIVE RECEIVE PRESELECTOR for 80,40, & 20m Tuneable on 80m, fixed tuned on 40 and 20m Can be configured for... no problems at all Practical Wireless, July 2010 w with the TM-G707E here Out and about o operating mobile, the s set performed equally i impeccably, with good a and loud audio from the s set’s top-panel mounted speaker It also has a very easily to read d display, which I certainly a appreciated My lab tests c confirmed the good on-air p performance, and I ended u up using a TM-G707E as my personal... of the integrated circuits has minimised this, and in the TL072 and TL074 series of op-amps the ‘input offset’ is typically only about 3mV Referring again to the skeleton filter diagram, the d.c gains of IC1 and IC2 are both unity, IC3 the filter has a gain no more than 3.6, for my breadboard model, and IC4 has a 36 Practical Wireless, July 2010 ... circuit of the project uses a PIC to perform all the functions and tone generation Ken Ginn G8NDL has the ideal solution, in the shape of a practical ‘add-on’ project for anyone who has older equipment that lacks a CTCSS Tone Encoder 26 Practical Wireless, July 2010 Fig 2: The interconnections for radios where the p.t.t line is taken to the 0V line Fig 3: The interconnections for radios where the p.t.t... 1980s Since that time, The system is used commercially and on repeaters in the manufacturers of certain components, namely the the UK to allow users to access the repeater This allows Practical Wireless, July 2010 27 A Practical CTCSS Tone Encoder the user to target and open only one specific repeater, rather than open up two or three which frequently occurred during lift conditions; which was often... aerial system through such a variety of test locations Ultimately, this gives the reader a real practical feel for the I-Pro Traveller’s true capabilities The review is extremely detailed and doesn’t leave any stone unturned, all in all an excellent job! Carl Kidd G4GTW, Pro Antennas Practical Wireless, July 2010 21 Please check with the organisers that the rally is ‘on’ before leaving home Send all your... constant low-level ‘whirring’ noise on receive My lab tests back in the days when the set was Practical Wireless, July 2010 launched showed the transceiver worked well, especially the strong signal rejection performance, although the 12.5kHz adjacent channel rejection wasn’t quite up to the mark of the TM-G707E But even so it offers very good performance for a dual-band set which was originally sold... eh? Next Column Again, as promised, in the next of these bi-monthly columns (in the Sept 2010 cover-dated issue of PW) I’ll be featuring a selection of ‘get you going’ h.f transceivers available at low cost together with a number of tips on how to get the very best out of them See you then! Practical Wireless, July 2010 33 Tony’s providing errors up-dates this month Tony Nailer’s doing it by design Tony... collapsed £199.95 TMF-3 Fiberglass mast * 6 sections 240cm each * 65-23mm * Approx 50ft erect 9ft collapsed £249.95 PICTURES ARE FOR REFERENCE ONLY New lower prices! Practical Wireless, July 2010 Review It’s portable and practical! The I-Pro Traveller Antenna I was invited by the Editor to check out another antenna product from Carl Kidd G4GTW and was delighted when the details arrived describing . y0 w1 h1" alt="" Practical Wireless July 2010 contents Volume 86. Number 7. Issue 1238. On sale 10 June 2010 Practical Wireless, July 2010 5 Copyright © PW PUBLISHING LTD. 2010. Copyright in. see – 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, . Steve Hunt. I-Pro Traveller photography by Dave Mason G3ZPR. Practical Wireless, July 2010 6 D avid Butler G4ASR has supported Practical Wireless for many years – 21 to be precise – and started