User Manual

GENERAL INFORMATION
1-2
Part No. 001-3422-003
1.2.2 DL-3422 WITH LOADER BOARD
The DL-3422 includes the 8-channel Loader board (Part No. 023-3240-001), which performs synthesizer
loading through an RS-232 DB-9 interface. In addition, this board has circuitry which provides electronic control
of the following:
Transmit/Receive data conditioning and gating
Carrier Detect
Power Control
Preselector Tracking
Modulation Flatness
Audio/Data Filtering
Sleep/Wake-up to minimize current consumption
Diagnostics that includes:
Input Voltage Sense
Input Current Sense
Ambient Temperature Sense
RSSI Indicator (RSSI Sense)
Forward/Reverse Power Sense.
The gating circuits allow user selection of data filtering (standard or wide band) and also pre-emphasis/de-
emphasis to be enabled or disabled.
This board is programmed using an IBM

PC or compatible computer and the Johnson Data Telemetry
programming software. Programming information is stored by an EEPROM on the Loader board. Refer to
Section 3 for programming information.
NOTE: The synthesizer must be loaded each time power is turned on. Therefore, one loader board or customer
supplied programming circuit is required for each data transceiver.
1.2.3 DL-3422 WITH DL-3295 MODEM
The DL-3496 modem (Part No. 023-3295-001) provides digital data transmission at data rates up to 9600
baud. The DL-3295 operates in Half-Duplex mode. However, two transceivers can be combined to provide Full-
Duplex operation. The user interface is a serial port through a 9-pin D-connector configurable to either RS-232 or
TTL signal levels. The data format is asynchronous with either 8 or 9 data bits. The modem can operate in either
standard DTE/DCE handshake p rotocol or in Data Activation mode which requires only receive and transmit data
lines. The baud rates are user selectable from 300 to 9600 baud.
1.2.4 DM-3422 SYNTHESIZER PROGRAMMING
The DM-3422, when used without the Universal Loader Board (Part No. 023-3240-001) requires customer
supplied circuitry to load the synthesizer with channel information. The protocol that this circuitry must follow is
described in Section 3.