PW 2011 05.pdf

May 2011 £3.50 ISSN 0141-0857

May 2011 £3.50

ISSN 0141-0857

Practical Way

Recycling old boards!

Antennas

Two whips re-visited

Anytone/

MyDEL-5189

Two whips re-visited

MyDEL-5189

70MHz FM Mobile

Buying

Second-hand

Coaxial cable and connectors

70MHz FM Mobile

Reviewed

Coaxial cable and connectors

Reviewed

Build a Small

Switching

Regulator

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Practical Wireless May 2011

contents

Volume 87. Number 5. Issue 1248. On sale 14 April 2011

Keylines

The Editor’s looking forward to spring and h.f.

portable operations!

Radio Waves – Readers’ Letters

Air your views and discuss topics of interest.

10 News

See what’s happening and what’s of interest

in the world of Amateur Radio.

Valve & Vintage

Antenna Workshop -

Two Whips Re-visited

This month Ben Nock G4BXD laments the

loss of local Amateur Radio and ‘Junk’ type

shops and comments on the opportunities

provided by the Internet.

Roy Walker G0TAK has been carrying

out some more development work on his

practical antenna that uses two tuneable whip

sections.

52 What Next?

18 The Anytone/MyDEL-5189

This month Colin Redwood G6MXL looks at

space for construction projects but starts with

a letter from a reader in Wales.

70MHz FM Mobile Transceiver

Tim Kirby G4VXE takes a break from

preparing The World of VHF to try out an

interesting 70MHz mobile transceiver.

The World of VHF

Our keen v.h.f. specialist author Tim Kirby

G4VXE has news from a friend who is

enjoying the out of this world Amateur Radio!

Carrying On The Practical Way

This month the Rev. George Dobbs G3RJV

discusses the recycling of old printed circuit

boards.

59 Morse Mode

Roger Cooke G3LDI , welcomes back a

recent escapee and chats about Marconi day

and marine Radio Officers.

Doing it by Design

This month Tony Nailer G4CFY deals with

toroidal transformers for a 50W h.f. linear

amplifier.

In The Shop

Harry Leeming G3LLL presents his regular

column where he remember his time running

a busy Amateur Radio shop and electronic

adventures with his customers!

A Switching Regulator of the

Small Kind!

Mike Bush G3LZM suggests an alternative

to the ubiquitous LM7805 regulator that often

‘wastes’ energy as heat.

64 HF Highlights

Carl Mason GW0VSW is looking forward

to holiday time and one reader has already

taken his equipment abroad and enjoyed it!

34 Radio Rallies

36 Data Modes

Classified Adverts

This month Mike Richards G4WNC is

covering a data mode that some Amateurs

currently considers to be a spread-spectrum

mode.

Bargain Basement

Traders’ Tables

PW Publishing Bookstore

Subscriptions

42 Buying Second-hand

Topical Talk

Following his previous column on second-

hand antennas, Chris Lorek G4HCL

continues by giving advice on coaxial cable

and connectors.

Front Cover

Tim Kirby G4VXE goes mobile with the Anytone/MyDEL-5189

70MHz FM Mobile Transceiver. Photo courtesy of Julie Kirby .

Copyright © PW PUBLISHING LTD. 2011. Copyright in all drawings, logos, photographs and articles published in Practical Wireless is fully protected and reproduction in whole or part is expressly forbidden. All reasonable precautions are taken by

Practical Wireless to ensure that the advice and data given to our readers are reliable. We cannot however guarantee it and we cannot accept legal responsibility for it. Prices are those current as we go to press.

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