Eddystone 840C Instruction Manual

-DDYSIO
The EDDYSTONE Model 840C is a single
conversion communications superhet receiver
covering the band 480 kc/s to 30 Mc/s in five
overlapping ranges. Provision is made for
the reception of both AM and CW signals
and although the receiver is not designed
specifically for SSB reception, such signals
can be received with careful tuning.
The receiver has a built-in power unit
allowing operation from all standard AC
and DC mains supplies. An internal loud-
speaker is fitted and provision is made for
connection of an external speaker unit.
Telephones can be plugged into a socket on
the front panel when a speaker output is
not required.
Ease of operation is assured by the logical
positioning and convenient dimensions of
the major controls. The high grade gear
driven slow motion tuning system allows
extremely fine tuning, while the flywheel
loading permits rapid movement from one
end of a range to the other. Dial calibration
is directly in terms of trequency, the scales
being linear and easy to read. A calibrated
vernier is used in conjunction with a special
logging scale so that dial settings can be
recorded for future use. A visual tuning
indicator is fitted as a further aid to accurate
tuning. Independent manual gain controls
together with an efficient automatic gain
control circuit allow the receiver to be set
for all levels of input signal and tone can be
adjusted by means of a panel control.
Advanced design, rugged construction and
high quality components are used throughout;
the receiver is of a most convenient size,
contemporary in appearance and suitable for
continuous operation in all areas under
extreme climatic conditions.
The five frequency ranges are as follows :—
Range |. 12-4 - 30 Me/s.
Range 2 5:2 — 12:9 Me/s.
Range 3. 2:5 - 6:1 Mejs.
Range 4. 1-12 — 2:58 Me/s.
Range 5. 480 — 1150 ke/s.
840C