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4.
Six Mechanical Filters.
Unless otherwise specified the fIlters shall conform to Racal part numbers 07883-1
thru 07883-6. Refer to Paragraph 1.4, Item #2 below for details.
1.4
OPTIONAL EQUIPMENT
The following optional equipment is available for use with the RACAL RA6790/GM HF
Receiver. Additional information regarding these and other options should be made through your
RACAL representative or directly to RACAL Communications, Inc.,
Roc~e,
Maryland, USA.
1,
2.
fudependent Sideban4 Module (lSB,
AS);
Selectable IF Bandwidth Mechanical Filters:
Shape Factor Racal
Bandwidth
Description
3 dB: 60 dB
Number
1.
0.3
kHz
. Symmetrical BPF
1 :6.7
07883-1
2.
1.0
kHz
Symmetrical BPF
1:4.5
07883-2
3.
3.2
kHz
Symmetrical BPF
1 :2.7
07883-3
4.
4.0
kHz
Symmetrical BPF
1 :2.5
3600001
5.
5.0
kHz
Symmetrical BPF
1 :2.5
3600002
6.
6.0
kHz
SymIp.etrical BPF
1 :2.3
07883-4
7.
450
Hz
to 3000
Hz
ISB/USB BPF
1: 1.92
07883-5
8.
450
Hz
to 3000
Hz
$
ISB/LSB BPF
1: 1.92
07883-6
9.
350
Hz
to 2700
Hz
USB BPF
1: 1.66
08669
10.
300
Hz
to 2200
Hz
USB BPF
1: 1.97
08771
Note that input and output matching capacitors are required with mechanical
fIlters only, contained on assembly A4.
3.
Selectable IF Bandwidth Crystal Filters:
The Receiver may be operated with one to seven different crystal bandwidth fIlters.
There are currently a total of 23 different fIlters available; however, depending on
Receiver configuration, some fIlters are mandatory. (Refer to the Installation Section
of this manual for defmition of IF Bandwidth Filter Installation.)
Bandwidth
1.0
kHz
3.0
kHz
6.0 kHz
1.0
kHz
3.0 kHz
.6.0 kHz
0.125 kHz
0.4 kHz
1.2 kHz
6.8
kHz
350 Hz to 3050 Hz
350
Hz
to 3050 Hz
0.4 kHz
Description
Symmetrical BPF
Symmetrical BPF
Symmetrical BPF
Symmetrical BPF
Symmetrical BPF
Symmetrical BPF
Symmetrical BPF
Symmetrical BPF
Symmetrical BPF
Symmetrical BPF
ISB/LSB BPF
ISB/USB
Symmetrical BPF
1-3
-
...
.--:,.-
Shape Factor Differential Racal
3 dB: 60 dB
Delay
/lS
Number
1 :6
1 :6
1 :6
1:2.5
1:2.5
1:2.5
1 :5.33
1 :6.2
1 :6
1 :3.3
1: 1.6
1: 1.6
1:2.5
25
13
10
1080
360
180
800
800
2000
3600003
3600004
3600005
3600006
3600007
3600008
08699
08406
08407
08408
08409
08410
08411
..
",
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