-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
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