Section 1
Operation

The O.T.I. DS-400 system is designed to expand the receiver frequency range of most 40-channel PLL transceiver systems now in use. The 400 is field programmable, which allows operation on different types of radios with one unit. The 400 automatically displays the receiver frequency with a 5-digit frequency monitor system. The operating frequency range of the receiver is now increased to a maximum
of 28.000 MHz' in 5 KHz steps. This gives the AM-SSB operator a total of 1200
channels. This system should be installed by a licensed technician only.

The Digi-Scan 400, will adapt to most 40-channel SSB, PLL radios. The applications chart beginning on Section 2 lists the radios which can be used with the 400.

Different types of radios have different frequency ranges. D. T. I. has developed a system whereby the user can tell if his radio is operating on the frequency displayed by the 400. The system is called an "out of lock" indicator. If, for any reason, the radio should go out of lock, the first digit on the 400, will become an "L" instead of a "2". (Shown in Fig. 1)

Identification: D. T. I. uses a basic numerical serial number series. Refer to the title page for any change that may affect your unit. All changes will be noted by serial number effectivity for easy reference. The serial number of the Digi-Scan is located on the bottom.

Frequency range is dependent on type of radio used. See applications chart for radio ranges.

CONTROLS AND FUNCTIONS
This section covers the various controls and basic description of their operation.

Fig. 1 - Controls and Functions
(DS-400 shown in an unlocked condition)

Scan Switch: A momentary toggle switch which controls the scan function. Push the scan switch down or up and hold for changes in frequency. (10 steps/second)

Step Switch: A momentary toggle switch which controls the frequency selection one step (5 KHz) at a time. Push the step switch up or down and release for each frequency change desired.

SPECIFICATIONS
Frequency Range . . . . . . . . . . . . . . . . . .25.995 MHz to 28.000 MHz * in 5 KHz steps
Readout. . . . . . . . . . . . . . . . . . . . . . . . . . 1/2" high, 5 digit,
7 segment LED Resolution . . . . . . . . . . least significant digit = 1 KHz
Power Consumption . . . . . . . . . . . . . . . 450 ma at 13.8 VDC (27.155)
Size . . . . . . . . . . . . . . . . .. . . . . . . . . . . . .1 1/2" x 5" x 5 1/2"
Scan Rate . . . . . . . . . . . . . . . . . . . . . . . 10 steps/sec.
Operating Temperature Range . . . . . . 10° to 40°C
Storage Temperature Range . . . . . . . . - 40 ° to 75 °C

* Frequency range is dependent on the type of radio used.