Eddystone 990R - Page 5

Other
Semiconductor
Devices
(etc.)
Ref
Type
Manufacturer
Circuit Function
D1
9
At\k>
MulWd
Overload
Protection
Diode.
D2
OA47
Mullard
Response
Correction
Diode.
D3 0A47
Mallard
AM
Detector.
D
4/5
OA79
Mullard
FM
Discriminator.
D6
BZY88*
Mullard.
RF AGC
Delay.
*C6V8
D7 OA47
Mullard
RF
AGC
Rectifier.
D8
!
OA47
1
Mullard
IF
AGC
Rectifier.
D9/10
0A202
Mullard
Uoise
Rectifier.
Dll
0AZ228
Mullard
10V
Supply
Regulator.
D12
DD006
Lucas
Reverse
Polarity
Protection.
D13
0AZ230
Mullard
12V
Supply
Regulator,
D14
M160T
G.E.C.
Supply
Rectifier.
1 —
Input
and
Output
Impedances
.
Aerial
Input
75Q
unbalanced
(BNC).
Ext Osc
Input
,
Low-
impedance
(bnc)
.
IF Output
1*
,
Low-impedance
(BNC).
IF
Output
2**
. .
Low-impedance
(bnc)
.
Video Output
iooon
(bnc).
Audio
Output
.
Loudspeaker
s
30.
*
wide
band.
**
narrow
band
Lines
s
600Q.
Headset
s
Low-Z*
IF Output 1
also
usable
as
10.
7
MHz
Input
.
TYPICAL
PERFQffilANCE
Noise Factor
.
Of
the order
lOdB.
Sensitivity
.
5(iV
for
lOdB s/n
ratio
with
50mW
output
in
AM
mode
with
selectivity
at
NARROW posn
(50
kHz
filter).
Spurious
Response
.
Deviation
.
50dB down.
Up
to
75
kHz.
Calibration
Accuracy
.
Within 1
fo.
Crystal-controlled
markers
are
available
at
10
MHz
intervals.
Prequency
Stability.
S
o
1
part
in
lCr per
C change
in ambienjfc
temperature.
Of
the
order
1
part
in
10
per
°C
with
crystal
control.
IF
Bandwidth ,
30
kHz
(crystal
filter)
and
200 kHz.
AGO Characteristic
.
The
audio
output level
does
not change hy
more
than
lOdB for an increase
in input
of
80dB
above
10pV.
Audio
Output .
The
30
loudspeaker
output
provides
a max-
imum
output power of 500mW at
10
Jo
distor-
tion.
Line
output
is
restricted to
lOmW.
Audio
Response
.
Level within
6dB
from
200
Hz
to
10 kHz.
IF
Output
.
An
output
of
the order
50mV
is
available
from
the
IF Output
2 socket.
This is
suitable for
driving the
EP
17
R
Panoramic
Display Unit
for bandwidths
up
to
200
kHz.
IF Output
1
provides
a
low-level
output at
greater
bandwidth on
the
higher
frequency
ranges
.
Video
Output and
Response
.
Output
is
of
the order 1
volt
p-p
into
a
10000
load.
Video
response
is
6dB down
at
20 Hz
and
100 kHz with
external
loading
of
250pF.
IF Converter
Type
939
°
(See
Appendix
n
D
n
)
Output
at
5*2
MHz
is
substantially
the
same as
the input drive
from the
990
R
receiver.
The
converter is
crystal-
controlled
and has
a
fixed
bandwidth
of
1
MHz.