July 1961 Popular Electronics
Table of Contents
Wax nostalgic about and learn from the history of early electronics. See articles
published October 1954 - April 1985. All copyrights are hereby acknowledged.
"But nine times out of ten
when you draw a blank in analytic geometry or calculus, you'll find that your trouble
is caused by weakness in algebraic manipulation." That statement is not a major
factor in the plot, but it does ring true in a familiar way. I remember noting that
the guys who had trouble in calculus class usually did so because they were weak
in basic algebra and trigonometry. An engineering calculus class moves at such a
rapid pace, with many new concepts thrown at you every day, that you absolutely
must not have to learn algebra and trig concurrently. My high school algebra skills
were pathetic, so prior to taking my first calculus course I took not only an algebra
course but also a precalculus course that taught trig identities, complex numbers,
and logarithms. I am convinced that without mastering those skills first, I could
not have earned "As" in all my calculus courses that followed. While I'm self-indulging,
let me also mention having been introduced to the word 'alacrity.' OK, on to the
storyline. Carl and Jerry build a minimum component FM radio using a tunnel diode
and a transistor, along with a handful of Rs,. Ls, and Cs.
Carl & Jerry: Treachery of Judas
By John T. Frye W9EGV
Outside it was a sizzling hot day, but Carl and Jerry were sitting in the comparative
coolness of their basement laboratory boning up on algebra. Although this might
seem like a strange activity for a couple of boys who had graduated from high school
only a month before, there was a good reason for it. Older boys drifting back from
college for summer vacation had passed the "word."
"Sharpen up your algebra! College math," they said, "is really tough. Assignments
there are three or four times as long as high school assignments, and you'll have
no time to catch up on fuzzy fundamentals. But nine times out of ten when you draw
a blank in analytic geometry or calculus, you'll find that your trouble is caused
by weakness in algebraic manipulation."
Carl and Jerry immediately dug out their algebra books and started going through
them right from the beginning, each working the exercises independently. When their
answers did not match, they examined their respective solutions until the mistake
was found. They both pledged to complete the review before leaving for college in
But the boys were only human; so they dropped their books with alacrity when
they heard a knock at the outside door and saw the outline of a visitor looming
through the screen. A huge man, well over six feet, stepped inside at Jerry's invitation
and stood in the middle of the floor mopping his brow.
"My name is Cody," he announced slowly in a deep voice as though he had rehearsed
every word. "I work for an agency of the federal government - it's not necessary
for you to know which one ... I have a problem, and Police Chief Morton thinks
you may be able to help me. I doubt it; but if you will come with me, I'll show
it to you." He was already walking back through the doorway as he finished speaking.
Jerry and Carl, exchanging puzzled glances, followed him to a small foreign car
standing at the curb. He was so big and the car so tiny that it seemed he did not
so much get into the car as put it on. After a glance at the well-occupied front
seat, the boys got in the back; and the stranger drove silently and rapidly out
of town along the highway leading west.
About five miles from town he pulled off on a seldom-traveled side road and stopped
beside a heavy growth of trees. "We have to go through the woods on foot," he announced,
displaying surprising agility as he climbed over the rail fence bordering the road.
He began to walk so swiftly that the boys almost had to trot to keep up with him;
yet those big square-toed shoes never snapped a twig or dislodged a noise-making
After a twenty-minute trek, the stranger motioned the boys to be silent and tested
the wind direction with a moistened forefinger. Then he lead them in a big semicircle,
dropped to his knees, and crawled toward the top of a small knoll. Carl and Jerry,
becoming more intrigued by the moment, slithered along beside him.
Finally the big man stopped, and pointed down through some low bushes at a small
tar-paper shack standing in a clearing not more than a hundred feet away. A short,
fat, bearded man was sitting on a low bench beside the open door playing a guitar;
and lying at his feet was the reason the government man wanted the wind to be blowing
from the cabin toward them. It was the largest, roughest-looking Saint Bernard dog
the boys had ever seen. A stout chain went from the dog's broad leather collar to
an iron stake driven into the earth near the door.
"There's my problem," Mr. Cody said in a hoarse whisper. "The man is the leader
of a communist-backed group trying to overthrow a government friendly to us. I have
information that two of his lieutenants may arrive at any hour for an important
meeting. It's most essential that I hear what's said at that meeting; but how? No
one can bug the shack with that dog on guard, and he and the man are always together.
Even if I could hide a mike in the shack, the conversation might take place outside
where it's cooler."
"I always thought Saint Bernards were kindly dogs that brought you a keg of brandy
when you were lost in the snow," Carl muttered.
"This one probably never saw those cartoons," the big man said with a trace of
a grin. "He's as mean as they come. When the man hears anything suspicious, he turns
the dog loose; and I'd as soon have a timber wolf after me."
"Wish I could see a little better," Jerry whispered. "I'm getting an idea."
Silently, Mr. Cody took a small telescope from his pocket and handed it to Jerry.
The latter focused it carefully on the dog for a few seconds, then handed it back.
"If you'll take us back to town to pick up some equipment, I think we can fix you
up," he said confidently.
The large man looked at the youth steadily for a moment, then turned around and
started crawling down the slope. On the way to the car, Jerry outlined his plan.
"My idea is to conceal a tiny FM transmitter inside the dog's collar. That collar
fits loosely, and there's plenty of room for the transmitter I have in mind. You
know what I'm talking about, Carl. It's that little tunnel-diode job we built from
plans in the fifth edition of G.E.'s Transistor Manual. In addition to the diode
and a transistor, all it uses are a few resistors and capacitors, a mike, and a
coil. We'll pick up the transmitter on Carl's transistorized FM receiver. Since
you say the dog and the man are always together, we should be able to overhear the
conversation no matter where it takes place."
"I'll have to take your word about what will work electronically - Morton claims
you know your stuff," the federal man said as they got into the car; "but aren't
you forgetting something? How are you going to get the collar off the dog to install
the transmitter? I'd rather try to change the rattles on a diamond-back snake."
"That's why I want to go see Doc Andrews, the veterinarian, first," Jerry. declared,
with an enigmatic look. Two could play at this close-mouthed business!
Back in town, Jerry asked Doctor Andrews if he had a Cap-Chur pistol.
When he said he did, Jerry asked if they could borrow it and a couple of charges
that would immobilize a hundred-pound dog. The doctor balked at this, but the federal
man took him over into a corner and showed him something in his wallet. From that
moment on, the veterinarian cooperated fully. He charged a couple of syringes with
300 milligrams each of a nicotine alkaloid drug and explained how the pistol was
to be used.
Mr. Cody then dropped Carl and Jerry off at their laboratory, saying that he
would be back in half an hour. The first thing the boys did was to arrange their
tunnel-diode transmitter on a flat metal sheet that could be fastened inside the
dog's collar. By the time they had collected Carl's transistor FM receiver, Jerry's
battery-operated tape recorder, a leather punch and some soft brass rivets, the
little car was standing at the curb again.
Their impatience made the trip to the edge of the woods seem much longer this
time. When they arrived, the federal man lifted a grain sack - which contained something
alive that squealed and grunted - out of the luggage compartment under the hood.
"What's with the little pig?" Carl asked.
"You'll see - maybe," the big fellow replied as he slung the sack over his shoulder
and headed into the woods. When they arrived at their former vantage point, both
the fat little man and his dog were apparently dozing.
"I'll stay here," Mr. Cody stated.
"You two go around to the other side of the clearing and take care of the dog.
When he scents you, he'll make a fuss and the man will turn him loose. Let him chase
you back into the woods out of sight before you shoot him."
"I like that," Carl said as they started working their way around the clearing.
"We do the dirty work. What's the dope on this Cap-Chur pistol, anyway?"
"The projectile is actually an automatic hypodermic syringe. When compressed
CO2 shoots it from the barrel of the pistol, a brass plug sealing an opening at
the back of the hollow rubber plunger is dislodged by inertia, exposing gas-generating
tablets inside the plunger to the action of water. A collar on the syringe needle
allows it to penetrate the skin of the animal to just the right depth; then the
gas generated by the tablets forces the plunger forward and injects the drug into
the muscular tissues. The pistol and a similar longer-range rifle are used a lot
by veterinarians, stock raisers, dog-catchers, and so on.
"Try to hit the dog right behind his rib cage," was Jerry's final instruction.
"Above all, don't miss!"
When they reached the edge of the clearing, the dog had awakened and was gnawing
on some bloody beef ribs. Every time he cracked one of the bones with his powerful
jaws, Carl winced. Suddenly the animal rose to his feet, sniffed the air suspiciously,
and began to growl.
"What's wrong, Judas? Somebody out there ?" the little man asked as he reached
over and unsnapped the chain. "Go get 'em!"
Carl and Jerry were already fading back into the woods, and the dog came bounding
straight toward them. Each boy scrambled up into the branches of a small tree. As
the dog stopped beneath them, raised his blood-stained muzzle into the air, and
peered at them with bloodshot eyes, Carl took careful aim with the pistol and pulled
There was a little "ph-t-t-t" of sound, the dog jumped, and a tuft of yarn fastened
to the back of the Cap-Chur projectile to keep it flying point-foremost appeared
in the dog's coat a hand-span ahead of his hip bone. Almost at once his head sank;
he staggered drunkenly about, and then rolled over on his side.
Quickly Jerry slid out of his tree and gingerly started unfastening the collar
from the unconscious dog.
"Oh, oh!" Carl exclaimed from his vantage point in the tree. "Fatso is getting
worried about Judas. Here he comes out of the shack with a double-barreled shotgun.
Now we're in a pickle. We'd better scram. Wait a minute ... Do you hear that?"
From the other side of the clearing there was a great rustling of leaves. The
little fat man, who had started to follow the dog, turned around and began cautiously
climbing the incline toward the federal agent's hiding place.
When the man with the shotgun had almost reached the bushes at the top of the
knoll, a squealing little pig burst out of them and ran toward him. "So, my little
rascal, you were the one making all that racket, were you?" he commented aloud,
with obvious relief, as he turned around.
Jerry had been working feverishly, punching holes in the collar, riveting the
transmitter in place, and arranging the 4 3/4"-length of black enameled wire that
served as an antenna for the 100-megacycle transmitter so it could function without
being noticed. He buckled the collar back in place and removed the Cap-Chur hypodermic
needle. Even as he did so, the dog began to stir.
The boys left hurriedly, but as they looked back over their shoulders, they saw
the huge beast get to his feet and - standing with his paws wide apart - shake his
"Here, Jude; here, Judas!" his master called. The dog turned around obediently
and started lumbering toward the shack. At the same instant there was the sound
of an automobile motor, and a car came bouncing out of the woods into the clearing.
Two dapper men stepped out and shook hands with the fat man.
Without waiting to see more, the boys returned to the place where they had left
"That pig came in real handy," Carl admitted as he stretched out beside the federal
"I thought it might," Mr. Cody grunted, handing the FM receiver and the portable
tape recorder to Jerry. The latter turned on the receiver with the volume down low,
and instantly the voices of the three men came in faintly but clearly; and well
they might. The fat man, with a visitor on either side of him, was sitting on the
bench fondling the dog's ears. The hidden mike could not have been in a better position
to pick up what was being said.
The conversation being taken down by the little portable recorder didn't make
much sense to the boys. It was all about automatic rifles, landing strips, beaches,
grenades, and "our agents." Dates and places were mentioned, and the whole thing
seemed intensely interesting and important to the big federal man, who scarcely
breathed as he listened.
Finally the two men shook hands with their host and left in their car. The little
man took Judas into the shack with him and began rattling pots and pans. The three
observers slipped quietly away through the woods.
"Goodbye, boys," the federal agent said abruptly as he let them out of the car
at Jerry's home. "You did a good job. Don't talk about what happened today - it's
more important than you can guess." Without another word he sped away.
"Well, that was a frustrating experience!" Carl fumed. "We couldn't tell anything
if we wanted to. We don't know anything. We don't know who Cody really is, who Fatso
is, what country is involved, why those men weren't arrested - "
"Whoa, slow down!" Jerry interrupted.
"No doubt Mr. Cody has good reason not to tell us more than he did. And we do
know one thing."
"Such as?" Carl challenged.
"Such as how to make a dog betray his master," Jerry said with a grin.
Carl Anderson and Jerry Bishop were two teenage boys whose
love of electronics, Ham radio, and all things technical afforded them ample opportunities
to satisfy their own curiosities, assist law enforcement and neighbors with solving
problems, and impressing – and sometimes toying with - friends based on their proclivity
for serious undertakings as well as fun.
Carl & Jerry, by John T. Frye
Carl and Jerry Frye were fictional characters in a series of short stories that
were published in Popular Electronics magazine from the late 1950s to the early
1970s. The stories were written by John T. Frye, who used the pseudonym "John T.
Carroll," and they followed the adventures of two teenage boys, Carl Anderson and
Jerry Bishop, who were interested in electronics and amateur radio.
In each story, Carl and Jerry would encounter a problem or challenge related
to electronics, and they would use their knowledge and ingenuity to solve it. The
stories were notable for their accurate descriptions of electronic circuits and
devices, and they were popular with both amateur radio enthusiasts and young people
interested in science and technology.
The Carl and Jerry stories were also notable for their emphasis on safety and
responsible behavior when working with electronics. Each story included a cautionary
note reminding readers to follow proper procedures and safety guidelines when handling
Although the Carl and Jerry stories were fictional, they were based on the experiences
of the author and his own sons, who were also interested in electronics and amateur
radio. The stories continue to be popular among amateur radio enthusiasts and electronics
hobbyists, and they are considered an important part of the history of electronics
and technology education.
- Going Up
- March 1955
Shock - September 1955
- A Low Blow
- March 1961
- The Black
Beast - May 1960
Electronik, September 1958
- Pi in
the Sky and Big Twist, February 1964
Bell Bull Session, December 1961
Boogie, August 1958
- TV Picture,
Eraser, August 1962
Trap, March 1956
at Work, June 1956
Aweigh, July 1956
Has His Day, August 1956
- The Hand
of Selene, November 1960
or Not?, October 1956
Electronic Beach Buggy, September 1956
Extra Sensory Perception, December 1956
in a Chimney, January 1956
Performance, November 1958
of Judas, July 1961
- The Sucker,
New Year, January 1963
Snow Machine, December 1960
Extracurricular Education, July 1963
Slow Motion for Quick Action, April 1963
Sleuthing, August 1963
- TV Antennas,
a Soroban, March 1963
Fair --", September 1963
Worm Warming, May 1961
Great Bank Robbery or "Heroes All" - October 1955
Operation Startled Starling - January 1955
- A Light
Subject - November 1954
Teaches Boy - February 1959
- Too Lucky
- August 1961
and Jeopardy - December 1963
Santa's Little Helpers - December 1955
Tough Customers - June 1960
Pocket Radio, TV Receivers
Yagi Antennas, May 1955
Stomping, March 1962
- The Blubber
Banisher, July 1959
- The Sparkling
Light, May 1962
Research Rewarded, June 1962
- A Hot Idea, March
- The Hot Dog
Case, December 1954
New Company is Launched, October 1956
the Mistletoe, December 1958
Eraser, August 1962
- "BBI", May 1959
Sound Waves, July 1955
- The River
Sniffer, July 1962
- Ham Radio,
Torero Electronico, April 1960
Wireless, January 1962
Electronic Shadow, September 1957
Induction, June 1963
- He Went
Detective, February 1958
an Instinct, December 1962
- Two Detectors,
with a Tachometer, July 1960
and the Pirates, April 1961
The Crazy Clock Caper, October 1960
Carl & Jerry: Their Complete Adventures is
now available. "From 1954 through 1964, Popular Electronics published 119 adventures
of Carl Anderson and Jerry Bishop, two teen boys with a passion for electronics
and a knack for getting into and out of trouble with haywire lash-ups built in Jerry's
basement. Better still, the boys explained how it all worked, and in doing so, launched
countless young people into careers in science and technology. Now, for the first
time ever, the full run of Carl and Jerry yarns by John T. Frye are available again,
in five authorized anthologies that include the full text and all illustrations."
Posted October 7, 2021
(updated from original post on 10/1/2014)