3-8 Theory of Operation: Transceiver Board
3.1.1.3 Antenna Port J101
Antenna port J101 is a surface-mount, miniature coaxial connector for the antenna cable.
3.1.1.4 Serial EEPROM
The electrically erasable programmable memory (EEPROM), U101, holds all of the transceiver
tuning data. This allows transceivers to be tuned in the factory and installed in the field without
retuning.
3.1.1.5 Power Conditioning Components
DC power-conditioning components include zener diodes, capacitors, ferrite beads, a power
inductor, and the fuse. Diodes VR200 and VR101 provide over-voltage protection. Ferrite beads
(designated E, etc.) and capacitors suppress electromagnetic interference from the transceiver.
The power-line filter consisting of L200, C202, and C203 suppresses digital noise from the VOCON
board switching power supplies that could degrade the transmitter spectral purity.
Ground clips M103 through M106 make contact between the transceiver board ground and the radio
chassis. The chassis connection is a necessary electrical reference point to complete the antenna
circuit path. Shields SH1 through SH14 appear on the schematic to show their connection to ground.
24 GROUND GROUND – – –
25 LOCK DIG_CTRL_LOCK O status FGU lock detect
26 BSTAT DIG_BATTERY_DATA I/O 1 wire IMPRES Battery status
27 TRIDENT_CS DIG_CTRL_SPI_TRIDENT_PE I spi SPI Trident chip select
28 UNSW_B+ DC_FUSED _B+ O dc Fused B+ to VOCON
29 SPI_DSP_MISO DIG_DATA_SPI_MISO O spi SPI data out
30 UNSW_B+ DC_FUSED _B+ O dc Fused B+ to VOCON
31 SPI_DSP_MOSI DIG_DATA_SPI_MOSI I/O spi SPI data I/O
32 UNSW_B+ DC_FUSED _B+ O dc Fused B+ to VOCON
33 SPI_DSP_CLK DIG_SPI_CLK I spi SPI clock
34 UNSW_B+ DC_FUSED _B+ O dc Fused B+ to VOCON
35 GROUND GROUND – – –
36 UNSW_B+ DC_FUSED _B+ O dc Fused B+ to VOCON
37 VCC_SW_3.6 DC_SW1_3_6V I dc Regulated 3.6 V
38 GROUND GROUND – – –
39 GROUND GROUND – – –
40 GROUND GROUND – – –
Table 3-2. VOCON Connector J1001 (Continued)
Pin
No.
VOCON Signal XCVR Signal
XCVR
I/O
Type Description
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