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–

–

–

• Make sure that the Baud Rate and Channel switches are set the same

on both boards

• Check that the antennas are connected

• Make sure that a jumper is installed on the Module Power Header

• Make sure that the batteries are not dead

If all of these appear to be in order, please call +1 800 736 6677 or e-mail

techsupport@linxtechnologies.com for technical support.

The Prototyping Area

In addition to its evaluation functions, the board may also be used for

product development. It features a prototyping area to facilitate the addition

of application-specific circuitry (Figure 4). The prototyping area contains a

large area of plated through-holes so that external circuitry can be placed

on the board. The holes are set at 0.100" on center with a 0.040" diameter,

accommodating most industry-standard SIP and DIP packages.

External circuitry can be easily interfaced to the NT transceiver through the

breakout header (TS1) to the right of the prototyping area. The Mode Select

switch should be set to the left position to enable the module’s lines to

be controlled from the prototyping area. At the bottom of the prototyping

area is a row connected to the 5V power supply and at the top is a row

connected to ground.

for additional circuitry. If more current is required, the user must add an

additional regulator or power the board from an external supply.

Figure 4: The Development Board

Prototyping Area

4

5

The TX Power Select Switch

The board has a switch to select among three different transmitter output

power levels (Figure 5). The right position sets the module to full power of

about 12dBm. The center position sets the output power to about 0dBm,

which is the legal limit for most applications. The left position uses resistor

R37 to set the power. This position is an unpopulated 0603 size resistor

location. A resistor can be placed here to set the output power to any

available level. Please see the NT Series Data Guide for more information

on resistor values. A power cycle is required for changes to take effect.

The Transceiver Area

The transceiver section consists of the transceiver module and a reverse-

polarity SMA connector as shown in Figure 6. The RP-SMA connector

is FCC compliant and reverses the center pin and socket. RP-SMA

connectors will mate with but not provide electrical connection to standard

SMA connectors or SMA equipped antennas. A header next to the module

disconnects the module’s power from the main board power. This can

be used for current measurements or to power the module alone from an

external power source. A jumper must be installed to power the module

from the board.

Figure 5: The Development Board TX Power Select Switch

Figure 6: The Development Board Transceiver Area