HR 1980 02.pdf

radjo

magazine

FEBRUARY 1980

coaxial-line transformers

Yagi antenna design

band balun

lecoder

I power supply

Coaxial-Line Transformers

and Broadband Baluns

ham

IT'S A FACT.. . HENRY RADIO STILL PRODUCES THE BROADEST LINE OF SUPERIOR QUALITY AMPLIFIERS IN THE WORLD.

WHETHER FOR AMATEUR RADIO, COMMERCIAL OR MILITARY USE, WE OFFER A CHOICE OF FIELD PROVEN STATE-

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Itsclass. The 1KD-5 was deslgned for the amateur who wants the quallty and dependablllty of the

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I& Pm-9 buy It. We hope that you will. If you "lift the Ild" on a 2KD-5 you wlll see

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And don't forget the rest of the Henry famlly of amateur ampllflem ... the Tempo 2002 hlgh power

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r We have been suggesting that you look lnslde any ampllfler before you

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An exclusive 10 amp RF ammeter insures maximum power to antenna

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Versatile antenna switch lets you select 2 coax lines thru tuner and 1

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Heavy duty encapsulated 4:1 ferrite

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MFJ-962 1.5 KW VERSA TUNER Ill

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A 200 watt 50 ohm dummy load lets you tune your exciter olf air for

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An accurate meter gives SWR, forward dreflectedpower in 2 ranges

Accurate meter gives SWR, forward

(2000 and 200 watts).

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in 2 ranges: 2000 and 200 watts. Encapsulated 4:l ferrite balun.

MFJ-982 3 XW VERSA TUNER IV

MFJ-961 1.5 KW Versa Tuner Ill

6 position antenna switch lets you

Antenna switch lets you select 1 coax

select 2 coax lines thru tuner or direct,

thru tuner and 2 coax thru tuner or

or random wire and balanced line.

direct, or random wire and balanced line.

the MFJ-961 is for you.

Why not visit your dealer today? Compare these 3 KW and 1.5 KW Versa Tuners to other tuners. You'll be convinced that its value,

quality and features make it a truly outstanding value. If no dealer is available, order direct from MFJ and try it. If not delighted,

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february 1980

More Details?CHECK-OFF Page 94

The MFJ-962 1.5 KW Versa Tuner 1

MF J ENTERPRISES, I NC.

ham

BRI

magazine

contents

Ia12p.~~-~n)~m~

12 new class of coaxial line transformers

George M. Badger, WGTC

19 Yagi antenna design:

experiments confirm computer analys

James L. Lawson, WZPV

28 high-performance broadband balun

John J. Nagle, K4KJ

36 third-generation tone decoder

James B. Wyma, WA7DPX

42 144-MHzsurplus cavity filters

William Tucker, W4FXE

50 regulated bench power supply

KennethE. Powell, WBGAFT

56 Wien bridge oscillator improvements

Courtney Hall, WA5SNZ

58 Heath HW-2036 carrier-operated relay

Gary L. Long, WD5HYQ

62 plasma-diode experiments

Dr. Harry E. Stockman

66 90-degree phase shift network offers

2:1 bandwidth

R. B. Wilds, KGZV

4 a second look 78 new products

94 advertisers index 8 presstop

85 flea market

94 reader service

82 ham mart

50 weekender

6 letters

february 1980

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