Magazine
73 Magazine
1379 East I5fh Street Brooklyn 30, N. Y.
April 1961 , , Vol. I, No. 7
Contents
Six Meter Nuvistor Converter......................Russell Summervrlie K8BYN . .____ 9
Two 6CW4"s in c».srofie give a fearfully low ntist- figure.
Power Meter..................................Tom Lamb K8ERV.............. 12
Another valuable niece of test gear for (he ham shack.
Surge Protection in Reverse......................Roy E. Pafenberg.............. 13
Protect your silicon diode power supply from destruction hy ^hortiii*i +
Let's Modulate, Not Crepitate...................Richard Genaille K4ZGM........ 14
Getting modulation f>ut of a Heisinjr Moiulatur.
A New Noise Limiter . .........................Jim Kyle K5JKX/6............. 16
Get out the soldering iron, this one'II tfo in your receiver.
Calibration ...................................Conway Wilson W4WQT....... 18
Why we haven't tfot it, how much we need it, and how io |fe£
Big Cannon .......................................................Jack Holloway W6VVZ......... 20
OK, here's a 20M KW amplifier, now Htcp bothering- us for that.
Tennessee Indians..............................Gray Berry K2SJN............. 25
The public relations side of taming: those Indians.
Half Wave Feedlines ...........................Bill Roberts W9HOV........... 27
One remnant feetlline for several band»? Yup.
Automation ...................................Jim Kyle K5JKX/6 .............. 28
You didn't think we'd pass up April without one feature, did you?
Audio Boosting the Command Receivers...........Art Korn K8HDR.............. 30
Turns out to be red icu loo sly simple . . , once y**u know how.
Pick Up the Droop.............................Howard Pyle W70E ........... 31
Your beam been ussy lately?
40 Watt Transistor Modulator....................Monroe McDonald KL7DLC ...... 32
Great for mobile rigs.
Testing the Heath Twoer.........................Don Smith W3UZN . . ........... 34
You will no doubt be flabberjusted to find that Don likes- the Twoer,
R-F Noise Suppression ..........................Bill Ashby K2TKN.............. 38
technical treatise on how lt> exorcise the noise demons from your car.
432 mc Transistorized Converter ...............J. Specially W3HIX ........... 40
Part II I ahemi, the schematic diagram.
Take Your Pick ................................Staff......................... 42
Big technical article: IK selectivity and the devious means used to train it.
Propagation Charts for April.....................Dave Brov/n K2IGY............ 54
What time, when, to where on what bands . , , jmibably.
Writinq for 73.................................Staff.......................... 56
How tn fret rich beyond your wildest drenms.
Staff:
Table of Contents .......................... 3 editor-publisher .............Wayne Green W2NSD
Editorial ................................... 4 publications manager .................. David Fish
New Use for a Crystal Socket..............24 associate editor ................Don Smith W3UZN
Ohmmeter Polarity Check .................... 27 associate editor.................Jim Kyle K5JKX/6
^ associate editor ............Marvin Lipton VE3DQX
'P *..............................associate editor ............. . .Charles Spitz W4API
Bande Linn K8LAP Cartoon . ............. 50 , , ,, t. VJ * ,, V,/A,CVM
safes represents"., e Jim Momssett WAohXU
Three Dee World and U.S. Maps............... 51 sdes represen+a+;/e ...........Jack Guheit W21ZX
Letters ..........................................................................52 photographer ...............Joe Schimmel W2QDM
Club Subscription Rates ..........................................52 subscriptions ................. Mrs. Virginia Green
AF MARS Technical Broadcasts......................59 transposition ........................ Porsche
Other Ham Publicalions ............................63 printing....... Ye Olde O briene Presse
COVER:W2MUM"s tower as photographed by Joe Schimmel W2QDM.
73 Magazine H published monthly ky Arniteur Rftditt Publishing, Inr , 116 street. Xr»rua!k. Connecticut. Business OiE^, 1S79 liast
I5(|i Sireet, Br^Kiyn :t0, Nt^ York, Telephone: NA r'-03fi0. Subscription raits: t'.S.A. tnd possessions, APO. Fro. Canada anil Mexico; one y^ar $3.00: two year^ J^.00; three years $7.Ufl Foreign: Mit year £4 00; years i7 "in Sei-oilil-rtaits postage raid at Norwalfc. Connecticut. Prints in the U.S.A. Entire contents mpyrlglit lDfil hy Amateur tUtlio Puhiiftiinjr, Inc. Postmaster: Please send form 3573 io 73 Muffazine, 1379 East loth Street, Brooklyn 30. New York.
The more observant readers will discover that we have thrown budgetary caution to the winds this month and have bound in a postcard. The reasons behind this are man yf old and would possibly be too numerous to mention were it not that I have little else to comment on.
Besides goading more of you to vote on the articles you find most interesting, the card also will enable the more industrious to request literature from our advertisers ju^t by writing in their name and addresses. Having already experienced the drawbacks of merely including a reader's service coupon in a magazine and being aware that the advertisers know how easy it is to circle a few extra numbers on incoming coupons to make the response look good, we plunged ahead with a more foolproof system.
Let me put in just a short congratulatory statement- You fellows have been doing a fine job and are holding up your end quite well as readers. The advertisers, who are paying for this magazine, are enthusiastic about your response and I note that many of them, after trying you out for a month or so, have decided to sign for a full year of advertising. Don't let down.
Building
We are getting more and more letters from readers who claim that 73 has pushed them over the brink and started them to home brewing. Operating is fun, but it is only half of the hobby. We have a long way to go yet. We'll keep at it with everything we can muster to develope this atrophied activity* Those of you who have been around the hobby for a few years can remember when the local distributor had a big parts department with tables of specials, You may even remember when parts manufacturers advertised in ham magazines. How many of you have seen a Bud catalog? I used to practically wear that one out looking over their coils, racks & panels, and small parts. Maybe, if we keep at it, we can see a return to the old days. Maybe we'll again be able to pour over catalogs of parts by National, Hammarlund, Johnson, Par-Metal, and Millen.
Propaganda
There are still a lot of fellows who don't know that 73 exists. We cannot, as you should be able to figure out, advertise in the other
(never say die)
ham journals. This means that we're depending quite a lot on your to tell others about 73, If every reader mentioned 73 to every contact on the air for a few weeks, every ham in the country would at least hear about the magazine.
Grumbles
Someone wrote in complaining because he found some small errors in the magazine. He wanted to know why we didn't hire a better proof reader- The three examples he used to prove that 73 is a "mass" of errors consisted of two words with transposed letters and our "Subscription Department" ad which he thought was mispelled.
We will have to hire our first proof reader before we can attempt to hire a better one. Virginia and the authors do the best they can to correct the sometimes incredible mish-mash that comes back from the printer. I look 'em over too. What in the devil is it that bothers some folks so much about an occasional word getting bolixed up ... it isn't as though this gave them even a slight difficulty in figuring out what is being written. The next thing you know we'll be getting requests for correct grammar usage- Good grief!
While these odd chaps are going over the magazine with a fine tooth comb looking for errors we are trying desperately just to make sure that we get all of each article in each issue. It is awfully easy to leave out a parts list| a coil table, or a photograph during the last hectic hours of hassle when we are trying to get everything set for the presses. Just how easy I found out last month when wTe managed to leave out the whole schematic diagram for the 432 mc converter. How many of you frustrated proof-readers noticed that one? Ha! Well, it's in this issue anyway, marked "part IL"
How come no proof readers? Because we are trying to bring you a new type of ham magazine and we started from scratch without much scratch* Proof-reading volunteers will be accepted at our editorial offices at any time, the only thing is that they will have to work for the same salary as the rest of the staff.
Caveat Emptor
In spite of our acknowledged poverty we are, I believe, the most particular when it comes tu our advertisers. Again, we have to depend on
mm wi
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