Texas Instruments 2000 LF Series, Application Note, Page: 13 / 38

Lit Number: 11-06-21-068
Page (7)
3.1.2 RFM-003B and RFM-007B Modules
The RFM-003B (Mini-RFM) and the RFM-007B (Power RFM) are shown in Figure 6
Figure 6. RFM-003B and RFM-007B Modules
The RFM-003B and RFM-007B modules both use capacitance tuning (using jumpers)
for the fine tuning. This circuit is represented in Figure 7.
Figure 7. Capacitance Fine-Tuning
3.1.3 The RFM-008B Tuning Board
The RFM-008B (Remote Antenna) Module’s resonant components have been taken
off the RF Module and attached to a separate tuning board. In this way it is possible
to have cable runs of up to 120 m (400’) between the RF Module and the tuning board.
Capacitance (C)
Antenna
Inductance (L)
Capacitance
Jumpers