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STD AF7KR HF antenna splitter v2
License: CC-BY-SA 3.0
Mode: Editors' pick
Cloned from AF7KR HF antenna splitter
- 1
Update time：
2021-11-03 14:45:10
Creation time：
2020-07-24 20:42:12
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.
Design Drawing
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| 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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