|Johnson Viking Ranger - Main Page and Exterior Photos||Alignment|
|Interior Photos of the Transmitter||Modifications|
|Restoration||Schematic Diagrams and Circuit Descriptions|
|Typical Operating Conditions||Manuals and Advertisements|
Important Safety Note: Working on or testing equipment such as the Viking Ranger is extremely dangerous since very high voltages are present when the equipment is turned on, and may even be present when the equipment is turned off and unplugged. If at all possible, do all work with the equipment off and unplugged and be sure that the capacitors are properly discharged before working on the equipment. The operator assumes all risk and liability in such matters! Do not work on this type of equipment unless you are experienced with working around very high voltages!
The Johnson Viking Ranger is a state of the art transmitter from the 1950s. It uses frequency multiplication and is plate modulated, features which are typical of AM phone/CW transmitters from that period.
The Ranger features a built in VFO, but is also capable of crystal controlled operation. Circuits to suppress television interference (TVI) are used extensively throughout the transmitter. The Ranger was built before solid state rectifiers were perfected, so the power supply uses vacuum tube rectifiers exclusively.
The Ranger is an advanced piece of equipment, but its operation can be understood when it is broken down into its individual circuits. To learn how each circuit works you can click on a link in the table below or you can click on the portion of the schematic diagram that you are interested in. Either way will take you to a separate page on that particular circuit.
Very High Resolution Schematic
A very high resolution copy of the entire transmitter schematic diagram is available here:
Very High Resolution Schematic Diagram Of The Johnson Viking Ranger
Right click on the link above and use the "Save Link As" or "Save Target As" option to save the file on your hard drive. It is a big file so I ask you to please avoid downloading it more than once if possible.
This was obtained from a product brochure for the Johnson Viking Ranger, and is the most detailed schematic I have been able to produce from that brochure. If viewed with an image viewing program under magnification, or printed on a high quality printer, it is possible to see exactly how the various rotary switches in the Ranger function.
I suggest that you print this schematic out on an 8.5" x 11" piece of paper and keep it next to you as you study the individual circuits. The complete schematic diagram will keep you aware of how the circuits work together as an entire group, while you study each circuit individually. You can also crop the main schematic and print out individual circuits in high resolution and excellent clarity.
Enjoy and 73,
|RF Circuits|| Audio Circuits
And Operate Switch
|Power Supply And Keyer Circuits|
|VFO||First Audio Amplifier||Bias/Keying Power Supply|
|Buffer/Crystal Oscillator||Second Audio Amplifier||Low B+ Power Supply|
|Multiplier||Audio Driver||High B+ Power Supply|
|Final Amplifier||Modulator||Timed Sequence Keying Circuit|
|Final Amplifier Tank Circuit|| Operate
AC Power/Control Section
Timed Sequence Keying Works
From Key Up To Key Down To Key Up
|Clamper||Operate Switch - B+ Section||Meter Circuit|
Click On Any
Part Of The Schematic Diagram Below For Information On That Part Of The
Click On Any Part Of The Schematic Diagram Above For Information On That Part Of The Circuit
Back to Dr. Greg Latta's Electrical Engineering and Amateur Radio Pages
If you have any questions or comments, you can send E-Mail to Dr. Greg Latta at email@example.com