Furuno GN-86F User Manual page 21

VANT
C1
0.25W
0.1uF
R2
5.1
Q2
R1
10
L1
39nH 56nH
Active
Antenna
Figure 3-8 Recommended Antenna Detection and Over Current Protection Circuit
Component Recommended Specification
C1,C2,C4
C3
L1
Q1
Q2
R1
R2
R3, R4
R5
R6
R7
2ch comparator Rail to Rail Input
U1
Open Collector /Drain Output
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FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide
Over Current Protection Antenna Detection Circuit
Circuit
Q1
R3 3k
R4
3k
Antenna Biasing
Circuit
C3 C2
33pF 0.1uF
Table 3-6 Bill of Material
0.1uF
33pF
39nH
PNP Transistor
PNP Transistor
10Ω±5%, 1/4W
5.1Ω±5%, 1/8W
3kΩ±5%
1.2kΩ±5%
12kΩ±5%
82kΩ±5%
R5 U1A
1.2k
3
VREF_O
2
Rail to Rail In
R6
U2B
12k
5
VREF_S
6
R7
82k
VDET
RF_IN
e.g. HK100539NJ-T (TAIYO YUDEN)
e.g. 2SA2029 (ROHM)
Corrector tolerance dispassion more than 1W
e.g. MCH6101 (SANYO)
e.g. TLV3402 (Texas Instruments)
17
SE13-900-001-06
VANT
C4
0.1uF
+
Under Current Detect
1
-
Open Collector/Drain
+
Over Current Detect
7
-
Notes
ANT_DET0
ANT_DET1