HR 1980 06.pdf

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ham

radio

magazine

JUNE 1980

kilowatt linear

Woodpecker noise blanker 18

Yagi antenna design

Antenna restrictions

Tone encoder

IT'S A FACT ... HENRY RADIO STILL PRODUCES THE BROADEST LINE OFSUPERIOR QUALITY AMPLIFIERS INTHE WORLD.

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

OF-THE-ART UNITS TO FIT THE REQUIREMENTS AND BUDGETS OF THE MOST DISCRIMINATING USER.

ifl; 1KD-5 ... the newest member of the famous Henry Radlo famlly of flne

buy It. We hope that you wlll. If you "lift the Ild" ona 2KD-5 you wlll see

only the hlghest quallty, heavy duty components and careful workmanshlp ... allrlbutes that

promlse a long llfeof contlnous operation Inany modeat full legal power. The 2KD-5 Isa 2000 wall

PEP lnput (1200watt PEP nomlnal output) RF Ilnear ampllfler, coverlng the 80,40,20, and 15 meter

amateur bands. It operates wlth two Elmac 3-5002 glass envelope trlodes and a PI-L plate clrcult

wlth a rotary sllver plated tank coll. Price $945.

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

VHF ampllfler and the broad llne of top quallty solld state ampllflem. Henry Radlo also offers the

3K-A and 4K-Ultra superb hlgh power H.F. ampllflers and a broad llne of commercial FCC type

accepted ampllflem for two way FM communlcations covering the range to 500 MHz.

NEW TOLL FREE ORDER NUMBER: (8MI) 421-8631 ' d-- ,

For all states except Callfornla

!. A

11240 W. Olympic Blrd.. Lm Anfjels. Calif. 90064 213,477-6701

931 N. Eucl~d.Anahelm. Cal~f. 92801

7141772.9200

Butler, Missour1 64730

8161679.3127

ampllflem. And we're still convlnced that it'd the world's flnest Ilnear In

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

2KD-5 and 2K-4, whomay prefer thesmallerslze, llghter welght and lower price andwho wlll settle

for a llttle less power. But make no mlstake, the 1KD-5 Is no slouch. Its 1200 watt PEP lnput (700

watt PEP nomlnal output) along with Its superb operating characterlstlcs will still punchout clean

powerful slgnals ... signals you'll be proud of. Compare Its speclflcatlons, Its features and Its flne

components and we're sure you wlll agree that the 1KD-5 Is a superb value at only $695.

2KD-5 We have been suggesting that you look Inslde any ampllfler before you

Callf res~dentsplease call collect on our regular numbers

'! WILSON SYSTEMS, INC. PRESENTS

THE NEW SYSTEM 40 TRlRAhlRER

3 MDNOBAND ANTENNAS IN ONE - EACH WITH FULL MONOBAND PERFORMANCE ij

FACTORY DIRECT

ONLY

i 1

1 1

A NEW CONCEPT IN ANTENNA DESIGN

USING A 26 FT. BOOM

FOR THE SERIOUS DXer WHO WANTS MONOBANDERS ON 10-1520

FOUR FULL SlZE 20 MTR ELEMENTS WITH 10 dbd GAlN

THREE WIDE SPACED 15 MTR ELEMENTS WITH 8.2 dbd GAIN

FOUR WlDE SPACED 10 MTR ELEMENTS WlTH 10.2 dbd GAIN

ONLY ONE FEED LINE REQUIRED

DESIGNED WITH NO INTERACTIONS BETWEEN ELEMENTS

ALL DRIVEN ELEMENTS AND DIRECTOR ELEMENTS ARE INSULATED FROM BOOM

ALL PARASITIC ELEMENTS ARE FULL SIZE

BROADBANDED-NO SEPARATE SETTINGS REQUIRED FOR PHONE OR CW

I I

SAME QUALITY HARDWARE AS USED IN ALL WILSON ANTENNAS

SPECIFICA TIONS

Max. RM. Input ........ Legal Limit Longest Element ............. 36 '

VSWR fi3 Res .............. 1.2:l Turning Radius.. ........... 22 6"

Impedance ............... 50 ohm Surface Area ........... 12.1 sq. ft.

rtrrm

Feed Method .. Coax Balun Supplied Wind Loading (a 80 mph ... 309 Ibs

......

Match~ngMethod ... Modified Beta Assem. Welght 75 Ibs.

F'B Ratio .................. 25 db Shipping Welght ......... 84 Ibs.

AVAILABLE ONLY

1-800-634-6898 FREE

TOLL

mnm

WILSON

! 5 Y S TEMS.IN(:.

89103

PRlCES AND SPECIACATDNS SUBJECT TO CM4NGE WlHOUl NOTICE.

', t'ol,,,,,, I ,,,, Vtq,t<, ~I~V;III,I

FACTORY DIRECT

CALL

.l,'?l,

WlHR

Becembrr 12, ~q3+4lpril 18, 1980

Ham Radio and ham radio meant much

to Jim Fisk. His concerns involved pride of

accomplishment and uncompromising

effort, sensing the perfection that is possi-

ble, but seldom achieved, in either elec-

tronics or publishing.

The magazine was a part of Jim from the

beginning, and its brain, body, and heart

were Jim's. His layouts breathed life into

the magazine's pages; his lean, clean prose

became a model for other publications.

The appearance of the magazine meant

much to Jim as he strove for perfection.

Jim's concern with ham radio was a

deep involvement. He wasn't a bystander

or an onlooker, but a participant par excel-

lence. And his participation often changed that in which he took part, to the benefit of all. Jim's last days

with us typified this attitude of involvement, participation, and enjoyment. Above all, his first, second, and

last looks were forward - to the future.

On Thursday morning, April 17, he came into the office with a lively step, a twinkle in his eyes, and

moustache bristling; he was barely able to contain his excitement. "Did you get on 20 last night?" he

asked. "The band was wide open; I've never heard better conditions, and - by God - I cracked some

pileups! I worked Mount Athos, Tahiti, Mali, and Mayotte . . . even His Majesty, King Hussein, JY1. You

know, I had never worked him before, and it was a thrill I'll never forget!"

He spoke with quiet pride of his Collins station, of his four-element Cushcraft monobander at 100 feet,

and of his joy at beating some of the 'big guns' at their own game. He expressed this in a letter to the OX

Bulletin:

The DX stations available during the past 24-36 hours have really been hard to believe. At one po;nt late

last night SVlJGIA, TZ4AQS and FHBFLP were QRMing one another just below 142001 And it's been a

long time since I worked three new ones in the space of a few hours. . . would have worked VKBKH, too,

but he's supposed to come up again tonight.

I have now worked the necessary contacts for 5B-DXCC, but am still short a few cards on 40 and 80

meters. As a matter of fact, my countries count on 80 is actually higher than on 15, but only because I

haven't had time to get my beam up on the tower.

So far as DX is concerned, April, 1980, has been a month to remember1 But damn, I missed KP2A

from 8Q7 . . .

Lunch that last day was a time to remember. Rush Drake, WRM, had dropped by to visit, and the talk

turned quickly to several large, high-performance high-frequency antenna systems that he had seen

recently. Soon, the placemats at the local restaurant were covered with exotic sketches representingnifty

ideas for multiple arrays with microprocessor controls; and Jim began to outline progress on his own excit-

ing plans for a multi-operator super station that would be the envy of every contester. Several parts of his

plan had already taken shape and some hardware was already in place. Jim hoped to have the rest finished

soon. The sunspots were riding high and Jim was certainly intending to make the best of them in the

months ahead.

We remember Jim's enthusiasm, his fire, his drive for perfection, his enjoyment of being who and where

he was, and his long-lived love affair with Ham Radio, symbolized by his call: W1HR.

Yes, we remember . . .

WlXU

2 W june 1980

ham

magazine

contents

12 220-MHz kilowatt linear

Robert I.Sutherland, W6PO

18 Woodpecker noise blanker

Ulrich L. Rohde, DJ2LR

20 automation for synthesized

two-meter fm mobile

David J. Brown, W9CGI

33 Yagi antenna design:

multi-element simplistic beams

James L. Lawson. W2PV

42 21-MHz phased verticals

Edmund H. Marriner. WGXM '

46 antenna restrictions

J.W. Bryant, N4AQD

51 tone encoder for auto patches

Christopher P. Winter, WB0VSZ

58 solid-state T-R switch

Malcolm Crawford, KlMC

62 understacking high-

frequency Yagi antennas

Robert M. Myers, WlXT

68 macromatcher improvements

Arnold C. Bachmann, K9DCJ

94 advertisers index 76 newprodu

85 flea market

8 publishers

70 ham mart

94 reader sen

72 ham notebook

june 1980

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