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21-3.3 Expanded Display
Some fields have the ability to expand their
contents to fill the entire screen. These fields
consist of the following:
Spectrum analyzer, clear scope, mod scope, ext
scope, bar graph displays
Encode tables
Dedicated keys
21-3.4 Dedicated Keys
Refer to Section 2-2.1 in this manual for an
explanation of the HELP, MEM, SPF, and CAL
keys.
21-3.5 Remote Operation
The R2670 Communications System Analyzer is
equipped with a standard RS-232 interface. This
interface may be used to remotely control the
analyzer using a set of commands, queries, and
responses that are defined in the General
Dynamics R2600 Series Communications System
Analyzer Programming Reference Manual (68-
80309E55).
21-3.6 HELP
The analyzer provides on-screen operating
instructions via the dedicated HELP key. Help
screens are organized such that each display area
has an associated help screen pertaining to that
area of the screen. System help is available via a
softkey within each help screen. Use the
softkey to return to the function in progress.
21-4
ENCRYPTION CAPABILITIES
When in PROJ 25 CONV mode, the R2670 can
operate in clear or hardware encrypted modes.
Project 25 equipment converts normal speech
patterns to their digital equivalent and then uses
an encryption algorithm to encrypt data for
transmission. A receiving radio, using the same
algorithm and a matching key, automatically
reverses the process so you can hear a normal
audio message.
A set of either U.S. or International encryption
algorithms is available with the Project 25.
Algorithms include Data-Encryption System
(DES) - a U.S. Federal Government encryption
standard, and Digital Voice Protection (DVP) - a
Motorola Proprietary encryption algorithm, and
DVI - a Motorola Proprietary encryption
algorithm for international use. Within a set, each
algorithm is individually selectable:
Domestic: DES-OFB, DES-XL, DVP-XL
International: DVI-XL, DVP-XL
21-5
TEST SETUP
Connecting a Radio
Use a 50 ohm BNC cable and an N to BNC
adapter to connect from the RF I/O port of the
R2670 analyzer to the antenna port of the radio as
shown in Figure 21-4.
When in Monitor mode, adjust the squelch to
where the LED indicator for squelch just
turns off or is closed. When the signal from
the radio is present, the squelch LED will
return
illuminate indicating that squelch has been
detected and there is a signal present.
Observe the input power ratings and warnings
of the analyzer to insure that no damage
occurs to the analyzer.
260
CAUTION
CAUTION
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