RSGB RadCom 2005 11.pdf

www.rsgb.org

The Radio Society of Great Britain Members’ Magazine

£3.95 Vol 81 No. 11

November 2005

INSIDE

BIGGING IT UP

US /mobile operators and

their giant antennas p18

SAFETY FIRST

Drive safely with the new

Watson WM-S mobile

microphone p22

THE PETER HART REVIEW

Software defined radio that

won’t break the bank – the

Elad FDM77 p24

NOISE CONTROL

DSP speakers from SGC and

bhi under the spotlight p30

HAM HEROES

Special report on Hurricane

Katrina amateur radio life

savers p32

IN PRACTICE

Can inductance vary with

frequency? We answer

your questions p70

TECHNICAL TOPICS

Passive squarer for

H-mode mixer, plus

mobile phone risks p73

Heavyweight

LOW ACHIEVERS

An in-depth look at the

use of antennas close to

the ground p80

champion

ARNHEM REVISITED

A theoretical appraisal of

radio propagation at the

Battle of Arnhem p85

ELECTION SPECIAL

Your opinions matter – vote

in our board elections p92

The new Radio Communication Handbook – it’s HUGE

New Matlock Opening Hours: 9am-5pm Tuesday to Friday, 10am-4pm Saturday, Closed Monday

NEW

FT-9000D NOW AVAILABLE

The NEW W aters & S tant on

NEW

• Free C arriage V ouchers • 400 Pa ges • Ful l

Colou r • Article s & Revie ws • Det ailed Spe c on

eve ry piece of Ham G ear • Ov er 4000 P roducts

50% DISCOUNT on any Heil Mic

when you purchase your FT-9000 from W&S

- the UK’s largets Yaesu Dealer,

Plus FREE entry into our £2000 Yaesu

Competition with 500:1 win chance.

A VA ILA BL E NO W !!!

FAST SAME-DAY DESPATCH

www.wsplc.com

Watson W-25SM 25 Amps

The switch-mode power supply that does not

have the problems of some competitive modes.

GREAT AFTER-SALES SERVICE

FREEPHONE

ORDER LINE

08000 73 73 88

Opening Offer Price

Hands Free!

£79. 95

£79.

RSGB says “Best

power supply tested”

£39 .95

£39

Ready-made

leads for:

Yaesu 2800, 7800

8800, 900,817,857

& 897.

Kenwood 271E,

D700E, & G707.

Icom 220H, E208,

2100, 2725, &

706.

Ready to Go!

Wired for your

transceiver

PTT Box

.95

Code WM-S

PRICEMA TCH!

TCH!

PRICEMA

Goose-neck mic mounts under visor

bolts and PTT mounts on gear-

change. All hardware included.

FREE lead for your radio includes

We will match or beat

any UK advertised

price on UK sourced

and UK guaranteed stock. Items must be in

stock with the competitor and brand new -

not B-Stock or old stock clearance.

Icom

HF Transceivers

Kenwood

HF Transceivers

Yaesu

HF Transceivers

CALL FREEPHONE SALES 08000 73 73 88

Visit our eBay shop for more bargains!

e B a y

ICOM IC-756 PRO MkIII

Top of its range HF

transceiver. HF &

50MHz, features

large colour LCD with

spectrum scope, auto

ATU and 32-bit floating

point DSP unit.

KENWOOD TS-2000

Top-of-the-range

Kenwood transceiver.

HF/VHF/UHF or up to

23cm with the optional

module. Built-in auto

ATU, DSP and its

unique TNC.

YAESU FT-857D

Our best selling Yaesu

HF Rig. Since the price

came down from £849

to £579 we can’t get

enough of them!

160-70cm mobile with

up to 100W output. Lovely tuning control from

remote head unit .

Low Price

£2099 C

Go to www.wsplc.com then click on

the link to our eBay shop

£1295 C

£579 C

IC-7800

£6400 C

TS-2000

2006!

BUY NOW PAY LATER AT ALL 3 STORES

AVAILABLE ON ALL SALES OVER £200

PAY NOTHING ‘TIL

NOTHING ‘TIL 2006!

Flagship HF 200W transceiver. 200W max. The

ultimate receiver - the ultimate design! AC psu built in.

The station in a box. 160m - 70cm with every feature

imaginable inc. DX cluster. Kenwood fans dream rig.

FT-1000 MKV

£2099 C

200W HF Transceiver, with EDSP, Collins filter, auto

ATU, 220V AC PSU - One of the finest rigs available.

TS-2000X

£1789 C

IC-7800-PACK

£6995 C

FT-1000 FIELD

£1699 C

The superb transceiver as above plus 17” flat screen,

keyboard and SM-20 base microphone.

Take the TS-2000 and add a superb 23cm module.

The best 23cm we know of plus all other bands!

The HF choice for DXers. With this rigs reputation on

DXpeditions what more persuasian do you need?

You won’t find a better deal!

Proof that at W&S you get the best possible deal. On

selected items it is now possible to pay nothing for a

whole year without incurring any interest charge. Amazing

but true. And what’s more, you get probably the best

prices in the business. Give us a call today or visit one of

our branches.

0% APR T YPICAL EXAMPLE OF BUY NOW PAY LATER .

C ASH PRICE £600. P AY NO DEPOSIT AND PAY THE FULL AMOUNT

BY THE DUE DATE . P AY NO INTEREST .

29.8% APR R EPAY £31.53 PER MONTH FOR 36

MONTHS , AFTER THE 12 MONTH PERIOD . T OTAL AMOUNT DUE

£1135.08. I NTEREST IS CALULATED FROM THE DATE OF THE

AGREEMENT .

A LL FINANCE SUBJECT TO STATUS WRITTEN QUOTATION ON

REQUEST .

TS-B2000 Low Price

Low Price £995 C

IC-7400

£1279 C

FTV-1000

£729 C

Designed for the 21st century. You get HF - 70cm with

PC software for direct PC control. It works great.

HF/VHF 160m - 2m transceiver 5 - 100W. SSB CW

FM AM. 12V DC. Nice big display. Lovely price.

6m 200W module for the FT-1000 range. Probably the

ultimate for 6m DXing.

TS-570DG Low Price

Low Price £799 C

IC-706 MkIIGDSP

£769 C

FT-897D

£649 C

The best budget radio at the price. Superb 100W from

160m to 10m. As used by Peter Waters, G3OJV

It’s unbeatable. 160m - 70cm (up to 100W HF) yet so

small with detachable head. The ultimate mobile.

160m - 70cm self-contained portable. 100W and up to

20W from optional internal batts.

TS-50S

£595 C

FT-847

£999 C

IC-718

£449 C

A great rugged mobile for 160m to 10m with up to

100W output. Also a great price.

Complete station in a box! 160m - 70cm - up to 100W

(50W 2m/70cm). Great for satellite work.

This is a budget class radio HF 16 - 10m at a price

that belies its performance. Beautiful display.

TS-480SAT Special

Special £699 C

FT-840

£399 C

IC-703 Free IC-703 Logbook

Free IC-703 Logbook £539 C

Is there any other radio that comes close to this price?

One of our all-time best sellers. 100W 160m - 10m

HF 160m - 6m with remote front panel. Large enough

for base use, small enough for mobile. Big display

Take an IC-706, reduce power to 10W max and get

rid of VHF. 160 - 6m of pure QRP joy!!

FT-817ND

£ Phone C

TS-480HX Special

£799 C

Special

NEW IC-7000

£Phone!

The ultimate QRP self-contained radio. Up to 5W out-

put 160m - 70cm. New low price. UK warranty.

Take the TS-480SAT, remove the auto ATU and offer a

beefy 200W output. That’s a really potent package!

The new IC-7000 is NOT a replacement for the

IC-706 but is a very much up-market design. It is in a

box about the same size as the IC-706 but very much

like an IC-756 in concept. This will be THE mobile rig

that others will have to aspire to!!.

FT-817DSP Low Price

Low Price £559 C

Warning - as a regular advertiser you can be sure all our

stock is genuine UK warranted. Check serial numbers!!

Carriage Charges: A=£3, B=£6, C=£10

Icom

VHF/UHF Handhelds

Linear Amp UK

HF Linear Amplifiers

NEW STOCK

& OFFERS

Icom

VHF/UHF Mobile/Base

W&S World Prefix Map

RANGER 811H

Special!

The new E-90 offers triple band

coverage of 6m, 2m and 70cms.

Up to 5W output and rx cover-

age from 495kHz - 999MHz

makes this a very attractive rig.

£199 B

NEW IC-V82

Digital Handy

IC-E90 Special!

ICOM IC-E208

VHF/UHF FM Dual

Band Mobile

Transceiver

*Freq range 144-146MHz, 430-440MHz Tx

*55/50W (3 pwr steps each band)

*Wideband Rx 118-173, 230-

549 & 810-999MHz

*1.8 - 29.7MHz

*800W CW or SSB, 400W RTTY

*Uses 4 x811A vertically mounted

*Drive 10 - 100W

*Toroidial AC Power Transformer

*6:1 Reduction Drive on Tuning

Controls *“Near Silent” Papst Cooling fan *Front-panel

ALC Adjust Control *Built-in AC 230V @ 8A Supply

NEW

£215 C

£945 B

NEW

IC-910H

£1087 C

2m / 70cm 100W Base station all - modes with

option for 23cm module ( UX-910 £359)

CHALLENGER III £1795 C

HF linear amplifier 10-160m WARC 100W in

1.5kW out

£159 B

Now in Stock!

IC-910HX

£1235 C

This attractive full colour map for amateurs

and SWL’s alike is split into regions, each

highlighted in a different colour with the ama-

teur prefixes in red. On the A2 map there are

more details regarding islands.. Both sizes

are laminated in flexible plastic.

A2 Size (WPMM-MAP) £4.99 A

A3 Size (WPMD-MAP) £2.99 A

As above but with 23cm module ready fitted and a

big saving as well.

Kenwood

VHF/UHF Handhelds

Ameritron

HF Linear Amplifiers

IC-2200H

£179 C

2m 55W FM mobile with rugged construction and

with digital option.

KENWOOD TH-F7E

IC-2725E

£269 C

NEW LOWER PRICES!

AL-1200XCE £2295.95 C

HF linear amp 10-160m 1.5kW

AL-1500XCE £2595.95 C

HF linear amp 10-160m 1.5kW

AL-800HXCE £2495.95 C

HF linear amp 10-160m 1.5kW

AL-82XCE £2295.95 C

HF linear amp 10-160m 1.5kW

AL-80BXCE £1395.95 C

HF linear amp 10-160m 1.5kW

AL-811HXCE £849.95 C

HF linear amp 10-160m 500W (3x811A)

ALS-500MXCE £819.95 C

HF linear amp 10-160m 500W solid state

ALS-600X £1299.95 C

HF linear amp 10-160m 600W (export only)

SGC

HF Linear Amplifiers

Icom’s dual band 2m / 70cm radio. Very easy to

operate and install and a lovely detachable head.

NEW LOWER PRICES!

• 144-146MHz Tx/Rx: FM

• 430-440MHz Tx/Rx: FM

Up to 6W out with Li-ion bat-

tery and “scanner” style

coverage from 100kHz to

1300MHz including SSB on

receive! This is a great radio

to have at all times when you

are on your travels.

Kenwood

VHF/UHF Mobile/Base

YAESU FT-60E

NEW

*Wide band Reception

108-520MHz &

700-999.990MHz

(Cellular blocked)

*New Emergency

Automatic ID System

*High 5W Power Output

*Ni-MH Long-Life Battery

FNB-83 (7.2V,1400mAh)

*Programmable Keys for user convenience

*Split CTCSS/DCS and DCS Encode-Only

Capability.

KENWOOD TMD-700E

2m/70cm dual band mobile

transceiver with APRS.

Does not need extra high

cost boards to function.

Only extra if required is a

compatible

GPS receiver. £418 C

TM-G707E £265 C

Dual Band 2m & 70cm with detachable front

TM-V7E £359 C

Dual Band 2m & 70cm with 50/35W output

TM-271E £187 C

Dual Band 2m FM 60W mobile transceiver

£237 B

TH-D7E £299 C

2m/70cm dualband FM handheld transceiver

with data communications

TH-G71E £179 C

2m/70cm dualband FM handheld transceiver

TH-K2E £139 C

2m FM 5W portable transceiver c/w Ni-MH

battery/charger

TH-K2ET £145 C

2m FM 5W portable transceiver c/w Ni-MH

battery/charger

TH-K4E £139 C

70cm FM 5W portable transceiver c/w

Ni-MH battery/charger

£169 B

MFJ-935B /936B

“Magic Circle”

Loop Tuner

This is the most amazing

antenna we have seen in

years. For optimum

results take a wire around

1/5th wave long, bend into

square loop (14ft on 20m

= 3.5ft square) and attach

to MFJ-935. Result: Ultra

low indoor noise and VK,

ZL & W all on SSB! That’s

what we achieved in one

day’s operation! 20m loop

works on 15m as well.

Now in Stock! Great for

QRP and portable as well.

NEW

Yaesu

VHF/UHF Mobile/Base

SG-500 £1399.95 C

“Power Cube” 1.6-30MHz 500W solid state

Yaesu

HF Linear Amplifiers

YAESU FT-7800E

*2m/70cms Dual

Band Mobile

*High power 50W

2m /40W 70cms

*Wide receive inc.

civil & military air-

band *CTCSS & DCS with direct keypad mic.

*Detachable front panel *1000 memories plus

five one-touch

Yaesu

VHF/UHF Handhelds

YAESU VX-6E

NEW

QUADRA (VL-1000) £3795 C

HF + 6m linear amp. 1kW comes with PSU

Tokyo Hy-Power

HF Linear Amplifiers

2m / 70cm Handheld

Transceiver, Wideband

receive including AM

Airband. Plus a Built-In

Morse Tutor.

In Stock Now! £189 C

VX-7R Special Of

£229 C

FT-2800M £149 C

*2m FM Mobile transceiver * High power

65W * Capable of VHF wideband receiver

FT-8800E £267 C

*2m/70cmDualband FM Mobile transceiver *

50W 2m, 35W 70cm * Wideband receiver

FT-8900R £339 C

*2m, 70cm, 6m & 10m Quadband FM Mobile

transceiver * Independent dial for each band

MFJ-935B is portable version with smaller meter

internal coil . £179.95 MFJ-936B has larger

meter and is ideal for base use. £229.95 . You

use your own wire to make loop (approx 1/5 wave

total length for lowest band) or purchase MFJ-57B

with cross arm and wire for 20/17/15m - approx 2ft

per side £39.95 . MFJ-58B has addition of wire

for 40/30m £54.95

HL-1KFX £1399.95 C

HF linear amp. 1.8-29.7MHz 500W PEP

max, solid state

HL-2KFX £2695.95 C

HF +6m linear amp 1.8-29.7MHz + 50MHz

1kW PEP max, solid state

HL-100BDX £429.95 C

HF+ 6m linear amp 3.5-29.7 & 50MHz

1-10W in 100W PEP solid state

fer £209 C

6m/2m/70cm handheld with huge 132x64 dot

matrix display, choose black or silver

VX-2E £119 C

2m/70cm miniature handheld transceiver with

LiON battery/charger

VX-110 £94 C

2m handheld transceiver with 8-key keypad

NiCd & charger

VX-150 £99 C

2m handheld transceiver with 16-key keypad

NiCd & charger

Alinco

VHF/UHF Handhelds

Special Of fer

Watson

Mobile Antenna’s

Yaesu

ADMS Software

ANTENNAS

W-2LE

WATSON VALUE

1/4 wave 2m 0.48m 200W

£9.95 B

Programme all your radio’s functions

and memories in a fraction of the time

using Windows - - - - - and save to disc!

+ FREE PC RADIO DATA LEAD

Versions available for: FT-857/FT-897,

FT-817, FT-8800, FT-8900, FT-7800,

FT-2800, FT-60E, VX-7 (needs CT-91),

VX-6E, VX-2E, VX110/150, VR-500

State model when

ordering

W-285

5/8th 2m 1.33m long 200W

£14.95 B

W-77LS

2m/70cm 0.42m 50W

£14.95 B

W-770HB

2m/70cm 1.1m 200W

£24.95 B

W-7900

2m/70cm 2m/70cm 1.58m

£32.95 B

WSM-270

Dual band mini magnetic

£19.95 B

DJ-V5E £159 C

2m/70cm FM 5W dualband handheld transceiver

DJ-193E £91 C

2m FM transceiver no keypad, Ni-Cds & charger

DJ-195E £99 C

2m FM transceiver with keypad Ni-Cds & charger

BASES

WM-08B 8cm diam magnetic £9.95 A

WM-14B 14cm diam magnetic £12.95 A

W-3HM Hatch mount £14.95 A

W-ECH Cable kit £12.95 B

NOTE: All antennas have PL-259 ends. Mag mounts

have cable attached. Hatch mount needs ECH cable.

£ 3 9 . 9 5 A

Carriage Charges: A=£3, B=£6, C=£10

NEW STOCK

& OFFERS

SGC

External Auto ATU’s

Icom

Internal Auto ATU’s

Hustler

Base Antennas

AT-180

£349.95 C

6-BTV

£229.95 C

MANSON SDC-2010

SGC SG-231

1 - 60MHz. 3 - 100W pep

(50W CW). Min wire length,

7m. 50 Ohm feed. Needs

12V at approx 900mA.

1.8 - 54 MHZ ATU designed for IC-708. Plugs directly

into transceiver for seamless operation. Coax only.

80 - 6m 6-band vertical. 7.3m tall 1kW. Can be used

at ground level with earth stake. Ideal small gardens

NEW

£9.95 A

5-BTV

£199.95 C

Kenwood

Internal Auto ATU’s

80 - 10m 5-band vert. 7.64m tall 1kW. Can be used

at ground level with earth stake. Ideal small gardens

* Cigar Plug-in DC adaptor

* 1.5 - 12V DC 1.5 Amps

* Stabalised and protected.

* 7 - way DC adaptor set.

* Matches most Yaesu / Alinco

sockets.

* Works from 12 V or 24 V

vehicle systems.

4-BTV

£169.95 C

AT-50

£319.95 C

40 - 10m 4-band vert. 6.52m tall 1kW. Can be used

at ground level with earth stake. Ideal small gardens

£349. 95 C

1.8 - 30 MHZ 100W ATU specifically designed for

use with TS-50 transceiver. Coaxial only.

Butternut

Antennas

SG-239

£189.95 C

Cushcraft

HF Antennas

Mini auto ATU 1.8 - 30MHz 1.5 - 200W PEP primari-

ly for long wires - non waterproof. 12V DC

SG-237

£299.95 C

HF2V

£229.95 C

MA5V

£239.95 C

1.8 - 60MHz 100W PEP. Great for mounting outdoors

and feeding long wire. Waterproof. 12V DC

80 / 40m high performance vertical. 1kW PEP 9.75m

tall. Self supporting for ground mount use.

POCKET MORSE READER

MFJ-461

Reads CW

Just hold near

receiver speaker

£69.95 B

That’s right - just hold this self-contained decoder near your speaker

and see the text scroll across the screen. Absolutely amazing

SG-2020ADSP QRP 20W HF Radio

160m - 10m

0.1 - 20W

Full DSP

Diecast Chassis

Vertical 5-band 20m - 10m. No separate radials

needed. 250W. Self-supporting. 4.48m tall.

HF6V

£299.95 C

SG-230

£339.95 C

A3-S

£469.95 D

6 band vertical 80-40-30-20-15-10m. 2kW. 7.9m tall.

Use own radials or ground mount.

1.8 - 30MHz 200W PEP. The original design that han-

dles end fed or coax unbalanced. Waterproof. 12V

The classic 20 15 10m 3-el beam. 2kW 8dB gain.

8.45 el. Turn radius 4.72m. F/B ratio 25dB.

SG-235

£749.95 C

HF9V

£349.95 C

3.5 - 54MHz. A hunky 120W PEP tuner that handles

long wires. Great outdoor design. Waterproof.

A3-WS

£379.95 D

9-band 80 40 30 20 17 15 12 10 6m vertical 1kW

7.9m tall. Use radials or ground mount

Dual Band 3 el beam for 17m & 12m. 2kW. El length

7.66m. Turn radius 4.4m. Gain 8dB. F/B ratio 25dB.

MAC-200

£259.95 C

Buddipole

Products

1.8 - 60MHz 200W PEP. Wire, coax and balanced

feeder. Features auto antenna switching.

A4-S

£569.95 D

Tri-band 4 element Yagi. for 20m - 10m. DXers delight.

2kW . 8.9dB gain F/B 25dB. Turn radius 5.49m

SG-211

£189.95 C

1.8 - 60MHz works off internal dry cells. Zero drain

wait state. 60W PEP. Ideal for portable (Min 1W).

R-8

£469.95 C

8-band vertical 40m - 6m. No separate radials need-

ed. 1.5kW. Height 8.7m

Icom

External Auto ATU’s

AH-3

R-6000

£329.95 C

6-band vertical 20m - 6m. No separate radials need-

ed. 1.5kW. Height 5.8m. Great small garden ant.

£479.95 C

MA5B

£369.95 C

HF Portable at its Best

1.8 - 28MHz. A hunky 120W PEP tuner that handles

whips or wire longer than 2.5m. Waterproof.

W3-BP

£179.95 B

Alinco

External Auto ATU’s

5-band 2 El mini

beam. 20m - 10m

2kW. Elements 5.2m

Turn radius 2.7m.

(Dipole on 17/12m)

5dB gain

40m - 2m adjustable dipole. 250W and max length

of 4.65m. Packs down to 65cm approx.

W3-MBP

£189.95 B

Perfect for QRP. SSB / CW and

DSP processing. Passband down

to 100Hz. Built-in SWR meter and

electronic keyer. Max Tx drain 4A.

Size 15 x 6.5 x 18cm. 680g.

£589.95 B

Sames as W3-BP but packs even smaller.

EDX-2

£289.95 C

W3-BS

£109.95 B

1.8 - 30MHz 150W long wire tuner designed for use

with DX-70 transceiver. Waterproof.

Diamond

HF Antennas

40m - 2m vertical is half a Buddipole. Ideal for QRP

and rucksack - as used by Peter Waters G3OJV.

Peter Waters says: I think these prod-

ucts are great. Superbly engineered and very

efficient . Options include adaptor for dipole to

decorators pole £6.95, Field tripod £89.95,

2.45m telescopic mast £49.95, mini tripod for

Buddistick.

Diamond

VHF / UHF Ants.

Diamond

HF Dipoles

DIAMOND CP6 VERTICAL

NEW

Super

Antennas

Compact

1 kW Wire

Dipoles

Covers five popular HF bands and the 6m band. Low

angle radiation makes it ideal for DX work.

Outperforms dipoles for long distance contacts and

compares favourably with beams located 10m+ above

ground.

*Bands: 3.5 -50MHz *Power: 200W *VSWR: Better than 1.5:1

*Socket: SO-239 *Height: 4.6m

*Radials: 1.8m rigid adjustable £239. 95 C

A144S5

5 el 2m 9.1dbi 0.95m L.

£29.95 C

A144S10

10 el 2m 11.6dbi 2.13m L

£59.95 C

A430S10

10 el 70cm 13.1dbi 1.19mL

£31.95 C

W-735 80/40m 26m long (85.5ft) balun fed wire dipole. Ideal

for small gardens. Just drop ends down for fitting into 50ft long

plots. £ 69.95 B

W-8010 80/40/20/15/10m 19.8m long (65ft) balun fed wire

dipole. Easily fits 50ft plot with ends dropped.

A430S15

15 el 70cm 14.8dbi 2.25m L.

£39.95 C

SB144

Boom for dual 2m Yagis

£19.95 B

SB430

Boom for dual 70cm Yagis

£15.95 B

SS144

Stack transformer 2-way 2m

£69.95 A

Radio Works

HF Antennas

MP1-SA

£139.95 B

SS430

Stack transformer 2-way 70cm

£59.95 A

£89.95 B

KB144

Mast stand-off for vert. polarise

£15.95 A

Screwdriver style adjustable HF QRP whip 40m -

70cm. 150W PEP. Max extended 185cm approx

KB430

Mast stand-off for vert. polarise

£14.95 A

High quality Diamond Japanese antennas

MP2-SA

£199.95 B

Antenna

Accessories

High quality Diamond Japanese antennas

CW-160

£129.95 C

Electrically tuned version of the above. Requires

around 9V - switch control box not included.

SGC

Internal Auto ATU’s

8-band 160m - 10m dipole with 22ft vertical radiat-

ing feeder. 1.5kW. Balun fed. 265ft long.

MP-80M

£29.95 A

CWS-160

£119.95 C

Add on 80m coil to extend the LF coverage of the

MP1 and MP2.

Antenna Traps (pairs)

TR-200

Compact 8-band 160m - 10m dipole with 22ft verti-

cal radiating feeder. 1.5kW. Balun fed. 133ft long.

High Sierra

Mobile Whips

200W 14MHz (20m)

£44.95

SG-237PCB

£279.95 C

CW-80

£89.95 C

TR-200-10 200W 10MHz (30m)

£47.95

1.8 - 60MHz 100W PEP. Same as SG-237 but without

housing for building into your own housing.

7-band 80m - 10m dipole with 22ft vertical radiating

feeder. 1.5kW. Balun fed. 133ft long.

TR-200-7

200W 7MHz (40m)

£49.95

TR-200-3.6 200W 3.6MHz (80m)

£53.95

HS-1800/PRO

£379.95 C

CWS-80

£109.95 C

TR-1000-141kW 14MHz (20m)

£59.95

Yaesu

Internal Auto ATU’s

TR-1000-101kW 10MHz (30m)

£61.95

Compact 7-band 80m -

10m dipole with 22ft

vertical radiating feed-

er. 1.5kW. Balun fed.

66ft long.

TR-1000-7 1kW 7MHz (40m)

£64.95

The ultimate mobile whip. Electrically

tuneable 80m - 6m 1kW PEP Includes

switch box and 12V cable. Massive 2”

coil. Made in USA. Superb!!

TR-1000-3.61kW 3.6MHz (80m)

£73.95

German Made High Quality Baluns

HB-1-200

FC-20

£249.95 C

1:1 3.5 - 30MHz 200W

£25.95

1.8 - 60MHz 100W matched for FT-100/Ft-847. Desk

top unit to match transceivers. Coax systems only.

HB-4-200

4:1 3.5-30MHz 200W

£25.95

SIDEKICK

£249.95 C

As used by Peter

Waters G3OJV/M

HB-6-200

6:1 3.5 - 30MHz 200W

£25.95

FC-30

£249.95 C

HB-1-1

1:1 3.5 - 30MHz 1kW

£34.95

G5RV Plus £59.95 C

Rugged 2kW balun matched G5RV

with 102ft element and 31ft ladder

line. Requires ATU. Made in USA

1.8 - 60MHz 100W. Designed for use with FT-

857/FT897. Coaxial input / output.

HB-4-1

4:1 3.5 - 30MHz 1kW

£41.95

Get mobile on all bands from 80m to 6m in

minutes. This compact screwdriver antenna

comes with cables and control box. Designed to

go on our 3-way magnetic mount (£39.95 extra)

it is an amazing performer and only 1.37m

maximum!

HB-6-1

6:1 3.5 - 30MHz 1kW

£41.95

FC-40

£239.00 C

Remote 4:1 1.5kW Balun

REM-BAL

1.8 - 60MHz 100W. New waterproof ATU designed for

use with FT-897 / FT-857 and mobile operation.

For coax to ladder line match

£45.95

Carriage Charges: A=£3, B=£6, C=£10

CONTENTS

November 2005

Contents

RADIO COMMUNICATION

Editor

Alexander Kearns

Technical Editor

Dr George Brown, M5ACN

Secretarial

Vicky Keep

Advertising Design

Jodie Escott, M3TPQ

All contributions and correspondence

concerning the content of RadCom should be

posted to:

The Editor, Radio Communication,

Lambda House, Cranborne Road

Potters Bar, Herts EN6 3JE

Tel: 0870 904 7373

Fax: 0870 904 7374

E-mail: radcom@rsgb.org.uk

ADVERTISING

All display and classiﬁed advertising enquiries

(excepting Members’ Ads)

should be sent to:

Chris Danby, G0DWV, Danby Advertising,

299 Reepham Road,

Hellesdon, Norwich NR6 5AD

Tel: 0870 904 7377; Fax: 0870 904 7378;

E-mail: adsales@rsgb.org.uk

p32 – Hurricane Katrina special report

p56 – Radio Communication Handbook

NEWS AND REPORTS

BOOK REVIEW

path used, and quickly

unearthed some interest-

ing questions.

RSGB Matters

Society news and

developments.

Handbook

The latest fully-revised

edition of the RSGB’s

Radio Communication

Handbook is reviewed

here. It’s a completely

new book and deserves a

closer look.

ELECTIONS

RadCom News

2005 Board elections

Make your vote count.

Read about who is stand-

ing, ﬁll in your ballot

paper, put it in the sup-

plied envelope and send it

off to RSGB HQ.

Notices to readers concerning errors and

omissions and advertisements can be found at

www.rsgb.org.uk/news/radcom.htm#notices

RadCom is published by the Radio Society

of Great Britain as its ofﬁcial journal on

the ﬁrst day of the relevant month and is

sent free and post paid to all members of

the Society.

Closing date for contributions, unless

otherwise notiﬁed, is ﬁve weeks prior to

publication date.

All material in RadCom is subject to editing

for length, clarity, style, punctuation,

grammar, legality and taste.

No responsibility can be assumed for the

return of unsolicited material

(if in doubt, call us ﬁrst!)

Articles are accepted on the strict

understanding that they are not currently on

offer to any other publication. Unless

otherwise indicated the RSGB has purchased

all rights to published articles.

LETTER FROM AMERICA

Mobiling US style

We report on the big

antennas that drive US

mobileers wild and

explain how UK hams can

quickly set up a high

performance mobiling

antenna for their cars.

TECHNICAL FEATURES

Whatever next

Is a DAB / DRM scrap

imminent at VHF? ♦ A

successor to the FT-1000

series – the FT-2000 ♦ The

Next Generation transceiv-

er – is it almost here?

REGULARS

Supporters of the Radio

Communications Foundation

PRODUCT REVIEW

IARU Matters

Mobile mic

Enjoy /mobiling while

driving safely with the

Watson WM-S mobile

microphone system from

Waters & Stanton. Chris

Lorek reports.

Club and regional news

In practice

Drilling through round

tubing ♦ Can inductance

vary with frequency? ♦

Superglue tips ♦

Gardening tip

Newcomers’ news, Steve

Hartley

HF, Don Field

HF propagation, Gwyn

Williams

Technical topics

Facts sacred – comment

free ♦ Small loops – ﬁnal,

ﬁnal words ♦ Mobile

phone risks ♦ Passive

squarer for H-mode mixer

The Peter Hart review

If you are looking for an

inexpensive software

deﬁned radio with an

adequate performance,

the FDM77 from Italian

ﬁrm Elad could be perfect

for you.

VHF/UHF, Norman Fitch

Designed and printed by Space Matters,

60 Borough High Street, London SE1 1XF.

Contest, Tim Kirby

SWL, Bob Treacher

RSGB MEMBERSHIP – Annual Rates

Home Corporate

£42.50

Performance of antennas

close to ground

Jack Belrose, VE2CV,

looks in great detail at

the use of antennas close

to the ground. The

doublet’s resistive

component increases with

decreasing height over real

ground, whereas it

decreases over perfect

electrically-conducting

ground.

Microwave, Sam Jewell

Overseas Corporate

£42.50

Corporate (Senior Citizens)

£33.50

ATV, Trevor Brown

DSP speakers

Want to improve the sound

quality of your equipment

without spending a for-

tune? If so, you need a

DSP speaker. Steve White

compares products from

SGC and bhi.

(Applications should provide

proof of age at last renewal date)

Corporate (50 years membership)

50% DISCOUNT

Corporate (60 years membership)

IOTA, Roger Balister

Repeaters, Mark Lewis

FREE

Morse, Dave Lawley

Family member

£18.50

Antennas, Peter Dodd

(Must reside with existing member.

Does not include RadCom)

Student Members

Space, John Heath

£28.50

SPECIAL REPORT

Member’s ads

(Applications should include

evidence of full-time student status)

HamClub (under 18) £18.50

Afﬁliated Societies (UK or Overseas) £42.50

Subscriptions include VAT where applicable.

Special arrangements exist for blind and

disabled persons. Details and membership

application forms are available from RSGB HQ.

P&P on RSGB orders: £1.75 for 1 item, £3.30

for 2 or more items. Overseas rates on request.

Hurricane Katrina

Radio hams turned

heroes in the wake of the

most destructive hurri-

cane to hit the US main-

land, saving countless

lives and reminding the

world of the importance of

amateur radio.

Radio propagation at

the Battle of Arnhem

Inspired by the earlier

RadCom article (February

2005), David Sumner,

G3PVH, set about a

theoretical appraisal of

the propagation over the

Congratulations

Silent Keys

Rallies and events

GB calls

103

The Last Word

www.rsgb.org

RadCom

November 2005

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