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Gregs Basic Electronics

Introduction To Basic Electronics

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We never cease to be amazed at the homebrew construction articles in the ham radio magazines. You know, the ones where the chassis doesn't have a single extra hole, and is all decked out with store bough ten parts,

Down about the third paragraph, the author casually mentions that part number F-l (Multi-Krammis Snickafoo Filter) can be special

Parts List

19" x 12" Chassis

350 mmfd variable (Raunchy Radio Co* Part.

#QQ4X4) t mid 400V tubulan

Kj mfd 700V electrolytic

750 tih RFC) 2.5 mh RFC) 26,000 Ohm, 2W resistor

50t0G0 Ohm, AW potentiometer

Fused Line Plug

90DVCT 200 ma power xfmr

S Henry 300 ma filter choke ordered from Shifting Sands Electronics Corporation for onlv $75. And of course old Charlie m_

down at the machine shop was happy to make the gears for the dial drive for $25.

Needless to say, this is enough to make the average amateur return to stamp collecting, One must inevitablv conclude that the amateur builder must be either a fabulously wealthy eccentric, or a bright young engineer with sticky fingers.

Fortunately, lellow amateurs, such is not tiie case - • > and in support of this statement the following parts list, complete with translation, is respectfully submitted.

Translation

Any size available. < "hcck kitchen for suitable cake pans, etc.

Tuning condenser removed from \ Y f/s c lock radio.

This is for the key-click fiiter, stupid . . leave it out.

Any electrolytic in the junk h**K which will handle the voltage. Check possibility of using assorted sizes iti serit-s.

Any size wire wound around varnished toilet paper tube. Cut and try for resouamg.

Two rf chokes from junk box „ , * inductance unknown.

Any combination of junk box resistors which hits within 5000 Ohms.

Grid drive control removed from front panel of hrothcr-in daw's rig,

Xo fuse necessary, l*se cord and pinti from XYLV hair dryer-

Cannibalized front stand by ritf if within 300V either way.

Secure from KSBNK's garage. Flashlight and sneakers are strongly recommended for tins < j]K*rat ¡0 11.

rito

E ectronics

Paul Barton W6JAT Jennings Radio San Jose 8, California

! he ads for courses in electronics read so rosy, it is misleading. The electronics course is an excellent thing to have, but is only the barest beginning towards a career in electronics, These courses only put you in a position to begin to learn how to actually do tilings. To get paid, you must be able to DO tilings. Experience as a ham is one of the best qualifications for an electronics technician career I he engineers are supposed to furnish most of the theory and the technicians are the practical workers thai put the theory into practice. Many an enginners lamp would be very dim without the backup of some sharp technicians,

Let's take a look in the Jennings Radios Radio Frequency testing laboratory to see what technicians might be doing on a typical day, i\it" Tuttle, senior electronic technician in Jennings Radio's Radio Frequency laboratory arrived as usual at about seven thirty A,M, As foreman, he is not "on the clock." He is privileged to keep his own time. So, he arrives

Leonard Espinosa operating Jennings Rig No» 3, o 20 KW linear amplifier with o 4 W 20,000 in the final.

about thirty minutes early every day—no overtime either—and usually is fifteen minutes or more late getting away at the day's encL But there are few tilings that would worry him less than a few extra minutes of his time on the job.

In the past half century or so. he has made a long string of tracks that has given him the wide experience that is so valuable on his present job. He has been on his present job for over 6 years. His previous job was as clectrical maintenance foreman for Westing-house during World War II. Before that was power house operator, and various other comparable jobs.

Most of his family are grown up now, fwo have gone to college. He is active in community work.

Only in recent years has Tut gotten a ham ticket, though he has had the ham instincts all his life. Now lie is as ardent a ham as any high school boy.

The brief few minutes before the gang arrive is about the only time till quitting time Tut will get to sit at his desk. He turns over a fresh page on the desk calendar and initials the work cards of his crew from the day before He knows from experience that this must be done before eight or they will likely not be done by the time the girl from accounting comes for them.

As the rest of the crew arrives, Tut exchanges pleasantries with them, while con« sidering the jobs to be worked on that day. The rest of the crew consists of technicians of various skills and levels of experience.

There is the usual load of rf testing to be done, plus some special tests. Tut discusses this with Bob Goddard, leadman.

Bob arrived with a ham ticket and a high school diploma some eight years earlier. Start

ing as a junior electronic technician 7 he worked up to leadman due to an excellent personality and a natural aptitude for getting things done, He was willing and able to accept responsibility and figured Miat if he worried about the work, the pay would take care of itself.

lake most of the technicians, Bob has set up an excellent ham station at his home, including SSB & Teletype. His other activities include bowling in the two-hundreds, and flying a Cessna 150.

Bob prepares for the days testing by examining the test reports left on his desk by the night crew, He puts these in the basket to be filed later by the secretary. Now he checks that his various operators are assigned and have work before them. By the time he has made a couple of telephone calls regarding units to be tested, made out a consolidated report for the supervisor's attention, and helped re-tune one of the transmitters that was a little balky, the noon whistle is stopping all official activity. Actually, tlio, the difference is small. Many of the tests are on a basis of time, and the operators are reluctant to interrupt them, so they pull out their "sacks" and eat while watching the test.

Bob has four test operators helping him with his regular testing, plus four more on special tests. His equipment includes a 50 by 150 foot building full of rigs from a few kilowatts to a hundred KW. There are rf generators to test switches, capacitors, insulators, etc. Most of the rigs are linear amplifiers for ease of control!ing the output and low harmonics. The operators have all been trained on the job, usually arriving with a ham ticket as their main credential Besides operating, they often maintain the equipment when needed.

Lloyd, the senior operator of the test crew, has had a ham ticket for 34 years. He proudly boasts 11 grandchildren. Very soon he will be great grandpa. Now he takes his test request sheet from Bob, along with a capacitor to be rated and returns to his 100 KW SSB rig, which has been warming up for 30 minutes, It takes only a few minutes to jig up for the test, theii excitation is applied to the proper output level. Now he settles back for the long, dull, but very exacting job of determining just how much current and voltage this capacitor can be expected to handle, A man of less experience could have trouble with this job. It is very easy to get wrong results that look correct, A crystal ball and a witchcraft license are probably part of Lloyd's regular equipment.

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