December 1953 QST
Table of Contents
Wax nostalgic about and learn from the history of early electronics. See articles
QST, published December 1915 - present (visit ARRL
for info). All copyrights hereby acknowledged.
"Merry Christmas!" Here is a 2-page
advertisement run by the
company in the December 1953 issue of the ARRL's QST magazine. E.F. Johnson
was a major player in amateur radio, and then later Citizens Band (CB) radio. They
also manufactured a large array of point-to-point commercial radio products (Land
Mobile Radio Service, LMRS, and Commercial Mobile Radio Service, CMRS), as well
a large line of RF connectors and adapters. The wireless automatic meter reading
(AMR) industry was pretty much born out of a very capable group of engineers, technicians,
assembly workers, and managers at E.F. Johnson's facility in Waseca, Minnesota.
They occupied a portion of the very large building where E.F. Johnson manufactured
its many products (back when Americans actually built electronics equipment). The
break-off company was originally named Enscan, and was later bought by
Sensus is another major
AMR product maker.
E. F. Johnson Christmas Ad
Just In Time for Christmas ...
Two New Johnson Products!
Provides accurate measurement of standing wove ratios to insure most effective
use of a low pass filter and antenna coupler for ultimate in TVI suppression. 52
ohms impedance can be changed to 70 ohms or other desired value. Equipped with SO-239
connectors and polarized meter jacks. 250-24 SWR Bridge, $9.75 Amateur Net.
Practice sets, semi-automatic, standard, and practice keys. Semi-automatic models
adjustable from lowest to highest speeds. Standard and practice keys feature coin
silver contacts and operate with a light keying touch. $1.45 to $21.00.
Viking Mobile Kit
Power pocked mobile. 807 amplifier, 60 watts maximum input, 100% amplitude modulated
with PP807's. Gang-tuned, bandswitching, 5 bands (75, 40, 20, 15 and 10) with VFO
provision. Series tuned output links ... solve loading problems. Dash mounting -
easily accessible - illuminated meter. 240-141 Viking Mobile Kit Complete, less
tubes, microphone, power supply and antenna, $99.50 Amateur Net. Also available
wired and tested.
Viking II Transmitter
TVI suppressed. All amateur bands from 10 to 160 meters. 100 watts phone output,
130 watts CW. Instant bandswitching - VFO input provision - dual power supplies.
All stages metered. Pi-network coupling output amplifier. Self contained - no plug-in
coils. 100% amplitude modulation. 240-102 Viking II Transmitter Kit, complete with
tubes, less crystals, key and mike. Amateur Net $279.50. Available wired and tested,
$337.00 Amateur Net.
Dual mobile antenna loading network for 10 and 20 meter amateur bands. Mounts
in center of standard mobile whip - enables operator to change bands in motion.
Operation is completely automatic, no relays or mechanical control required. After
initial adjustment, Bi-Net requires no further attention. Enclosed in streamlined,
weatherproof plastic housing - equipped with 3/8"x 24 female threads for antenna
mounting. Size, 4 7/16" high, 5 5/16" long, 2 3/8" width, weight 14 oz. 250-22
Johnson "Bi-Net" $10.95 Amateur Net.
Johnson Rotomatic Rotator
All-weather antenna rotator designed for rugged service. Light weight cast aluminum
housing with 5/16" steel rotating table. Unit tilts for simplified beam adjustment.
Safely supports dual beams weighing up to 175 pounds. Reversible 360° rotation.
Slip rings handle up to 2 1/2 KW. Assembly includes control box with selsyn operated,
illuminated dial. Controls, rotation switch, power switch and antenna relay switch.
138-112 Johnson Rotomatic Rotator, $324.00 Amateur Net.
"Matchbox" loads an almost infinite variety of antennas from 3.5 to 30.0 mcs.
Matches balanced antennas from 25 to 1200 ohms resistance. Loads unbalanced, or
single wire antennas of approximately 25 to 3000 ohms resistance. Tunes out large
amounts of reactance. Self-contained antenna changeover relay. Bandswitching - front
panel controls - no internal adjustment required to change bonds. 250-23 Johnson
"Matchbox", assembled, wired, tested, $49.85 Amateur Net.
Johnson Signal Sentry
Designed for monitoring either CW or phone signals without regard to operating
frequency, the Johnson Signal Sentry is energized by transmitter RF. Receiver audio
muted for break-in operation. Unit may be used as a code practice oscillator, with
slight modification. Size: 3 /8"x3 5/8" x 3 3/4". Tubes required, but not furnished:
one 12AX7 and One 12AU7. Weight: approx. 3 pounds.
250-25 Johnson Signal Sentry, completely assembled, less tubes; installation
$14.70 Amateur Net
Viking Mobile VFO
A diminutive variable frequency oscillator designed specifically for mobile use.
Compensated for an extremely wide range of ambient temperatures, the Johnson Mobile
VFO is only 4"x 4 1/4"x 5". Output is sufficient to drive any straight pentode crystal
stage as an amplifier. Circuit design, rigid construction, and heavy aluminum cabinet
minimize frequency shift due to road shock and vibration. Tube line-up consists
of a 6BH6 oscillator, 6BH6 isolation amplifier frequency multiplier, 0A2 voltage
regulator. 250-152 Viking Mobile VFO in complete kit form, less tubes; assembly
and operating instructions included: $29.45 Amateur Net.
Available factory assembled, less tubes; wired and tested, 250-152-2
$44.95 Amateur Net.
Accurately calibrated for all amateur bands from 10 to 160 meters. Excellent
stability, vernier tuning, clean keying, and perfect "break-in" on all bands. 240-122
Viking VFO kit complete, less tube.; $42.75 Amateur Net. Available wired and tested,
$63.75 Amateur Net.
Low Pass RF Filter
Consists of four individually shielded sections, capable of handling more than
1000 Watts amplitude modulated. RF. Provides 75 db harmonic attenuation in the antenna
circuit, 50-239 coaxial connectors, assembled and pre-tuned. 250-20 Low Pass RF
Filter, $16.50 Amateur Net.
Best buy of any season!
Johnson Amateur Equipment
E. F. Johnson Company
210 Second Ave. Waseca, Minnesota
Capacitors Inductors Sockets Insulators Plugs Jacks Knobs Dials and Pilot Lights
Posted December 13, 2022
(updated from original
post on 12/5/2016)
Here are a few other Christmas-related items on RF Cafe: