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AF7KR HF antenna splitter v2

1 year ago 1197
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Description

Active splitter to use 1 HF antenna with multiple receivers. Includes bias T, 35MHz LPF and 1.8MHz HPF. The response in the bandpass is flat, +/-1dB. FM radio suppression is very good, 60..80dB. Observed oscillations aound 70MHz when only one output is loaded. If you see this, load the unused outputs (a short or 50 Ohm is ok). The bias T choke may saturate if the preamp current is more than 50mA. Use a bigger core of fewer turns for higher current. If you measure IP2/IP3, please let me know.

Documents

Sheet_1

PCB v2 copy

BOM

ID Name Designator Footprint Quantity
1 680 C1,C4 1206 2
2 470 C2,C3 1206 2
3 1u C5,C11,C12,C13,C14,C15,C16,C17,C18,C19,C20,C21 1206 12
4 10n C6 1206 1
5 47 C7,C10 1206 2
6 150 C9 1206 1
7 1N4148 D1 D_DO-35_SOD27_P5.08MM_VERTICAL_KATHODEUP 1
8 LO J1,J3 HDR-1X2/2.54 2
9 +12V J2 HDR-1X2/2.54 1
10 470u L1 L_T50_VERTICAL 1
11 4.3u L2,L4 L_T50_VERTICAL 2
12 4.1u L3 L_T50_VERTICAL 1
13 0.33u L5,L6 L0805 2
14 RF IN P1 CONN-SMD_KH-SMA-KE8-G 1
15 OUT1 P2,P3,P4,P5 CONN-SMD_KH-SMA-KE8-G 4
16 MMBT2222A Q1,Q3,Q5,Q7 PG-SOT23-3_L2.9-W1.3-P1.90-LS2.4-BR 4
17 MMBT2907A Q2,Q4,Q6,Q8 PG-SOT23-3_L2.9-W1.3-P1.90-LS2.4-BR 4
18 430 R1,R3 1206 2
19 220 R2 1206 1
20 27 R4,R6,R8,R10 1206 4
21 22 R5,R7,R9,R11 1206 4
22 XFMR T1 BN43-2402 1

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