LG-17 Ionospheric RecorderPURPOSE:
This transmitter sweeps all or part of the HF frequency range by transmitting short pulses. These pulses are reflected at various layers of the ionosphere, at heights of 100-400 km, and their echoes are received by the receiver and analyzed by the control system. The result is displayed in the form of an ionogram, a graph of reflection height (actually time between transmission and reception of pulse) versus carrier frequency. An ionosonde is used for finding the optimum operation frequencies for broadcasts or two-way communications in the high frequency range. The
results are recorded on photographic film.
Frequency sweep range: 100 KHz to 19.4 MHz
Power output: between 5 and 15 KW
Sweep duration: 4, 8, 16, 21, 40, 80, 160 or 320 seconds per sweep
Pulse repetition frequency: 10, 20, 30 or 60 pulses per second
Pulse duration: 50 or 100 microseconds
Height range: 500 and 1200 km adjustable.
Display: 'B' type for 35mm film; panoramic for 16mm film.
Power consumption: 115 VAC 2.8 kw
|LG-17 Ionospheric Recorder (Photo courtesy Canada Science and Technology Museum, Ottawa)|
Contributors and Credits
1) Photo https://ingeniumcanada.org/ingenium/collection-research/collection-item.php?id=1972.0351.001
2) Specs https://books.google.ca/books?id=L8U3BQAAQBAJ&pg=PR17&lpg=PR17&dq=LG17+ionospheric+recorder&