E.F. Johnson Invader
- Type
- Desktop Amateur HF Transmitter
- Frequency range RX
- -
- TX
- 80-10 m
- Frequency stability
- -
- Tuning steps
- -
- Filters
- -
- Modulations
- -
- Sensitivity
- -
- Selectivity
- -
- Receiver system
- -
- IF-frequencies
- -
- Image rejection
- -
- Audio output
- -
- Modulations
- AM / CW / SSB
- RF-output
- AM: 50 W, SSB/CW: 100 W
- Antenna
- -
- Impedance
- -
- Power requirements
- Mains (internal PSU)
- Current drain RX
- -
- TX
- -
- Dimensions (w×h×d)
- 292 × 530 × 445 mm (11.50 × 20.87 × 17.52 in)
- Weight
- 25 kg (55.2 lbs)
- Form factor
- Desktop
- Manufactured
- Between 1960 and 1963 in USA
- Memories
- -
- Usage
- Amateur / Ham radio operators
- Manufacturer
- E.F. Johnson
- Model
- Invader
- Features
- VFO
Internal power supply
Final Tube(s): 2ea. 6146 parallel
SSB Method: Crystal Filter (9 MHz)
- None available
Price History
Estimating the value of a rig, especially an old one, can be challenging. The graph below displays what others have paid for this rig over the years. May it guide you to good fortune...
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Reviews
Classic Boat Anchor
dgalligan60  |
Jun 10th 2012, 21:33 | Performance | |
| Purchased: USD 550.00 (Used) in 2012 | Build quality |  |
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Often overlooked, in favor of the older AM/CW transmitters, this is one of the last classic Boat Anchors, and in my opinion, one of the best. It, and it's big brother, the 2K, are the last of the BIG, Johnson Boat Anchors, and are all too often overlooked, by boat anchor collectors. Personally, I prefer the transmitters that also give you SSB, built-in, like this one, the KWS-1, and the Heath Marauder. It just makes them more versatile. While they might not be optimal radios for working SSB, they get the job done, and do it well. Beside, the receiver is the more important part of the set up.