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JOHNSON VIKING ADVENTURER TRANSMITTER
E. F. Johnson Model Number: 240-181 SN 20380(?, hard to read these days)
In 1966 Woody's first transmitter was a Johnson Viking Adventurer.
Be careful when using the Johnson Adventurer on 80-meters!
It can have two dips in the plate.
One will load most of your RF out onto the Second Harmonic
which can fall outside the 40-meter band.
In 1966 I hadn't known this and
it resulted in me receiving three official FCC citations
and nine ARRL Official Observer notices for out-of-band operation!
I actually had a stronger signal on the 7.4 mHz second-harmonic
than I did on the expected 80-meter 3.7 mHz fundamental frequency!
My unit has now been "re-capped" and is in excellent working condition.
RF output into an MFJ dummy load via a digital wattmeter shows about 28-watts.
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The 1966-1967 ham shack:
Above right: The 1966-1967 ham shack.
(See additional photos below)
(1958) Johnson Adventurer transmitter,
(1962) Hammarlund HQ-110c receiver,
(1965) Allied Knight-Kit Star Roamer receiver
My grandfather's, Ken, (KIA WW2) 1930's Signal Electric lacquered brass Model R-63 hand key and
my 1956 Vibroplex Blue Racer bug.
My father, Ralph, had made the desk in woodshop while attending Ann Arbor (Michigan) High School in about 1936.
He had "donated" it for my shortwave listening (SWL) in about 1963 which continued throughout my amateur radio career to this day.
My grandfather, Arthur, signed and dated his new clock when he was 44-years old, in June 1932 - over 80-years ago.
Built for perhaps nine years: 1954 through 1963
the EF Johnson Viking Adventurer transmitter
became one of the leading Novice-class radio transmitters
of it's era.
Johnson Viking Adventurer
Mode: CW (AM with optional plug-in Modulator
Bands: 80 - 10 Meters
Input Power: 50W-CW
Output Power: About 28W-CW
Final Tube: 807
Total of three tubes: 807 6AG7 5U4G
VFO: Plug-in option
New Price: $54.95 kit and $69.95 wired
Size: 7.5"h x 10.5"w x 8.25"d
Approx. Weight: 17 lbs
EF Johnson Adventurer PDF
Manual (1.9 MB)
EF Johnson 1957 Color Sales Flyer (7.44 MB)
There are High Voltages with enough punch to easily kill you
exposed all over inside these old rigs
both above and below the chassis.
The capacitors can hold a lethal charge
well after voltage is turned off and the rig is unplugged.
Make sure to bleed off capacitors with an insulated and grounded screw driver
before touching anything
even after the unit is physically unplugged from the AC outlet.
Remember the old ham radio and electronics practice...
Work on the radio one handed leaving one hand behind your back.
If you have both hands inside the unit and accidentally touch a lead or brush a capacitor
current could potentially pass through your body and stop your heart.
Always instruct others to turn off the circuit breaker
or unplug the radio
before touching you if you are bit else they might be electrocuted, too.
OTHER RELATED ADVENTURER WEB PAGES:
Since 5 April, 2013:
All personal materials, comments, pictures copyright 1997-2014 R Linwood (4L RANCH)