# VHF Double\-Conversion Downconverter

## Description

Phase 1 prototype 200–240 MHz CW receiver front end with external local oscillators, 45 MHz first IF, 10\.7 MHz second IF, and a fixed 222 mm × 64 mm four\-layer RF PCB\.

## Project Details

- **Owner:** snowhill73
- **Created:** 9/11/2026
- **Last Updated:** 9/11/2026
- **Visibility:** Public

## Key Components

### D1 — [TPD1E1B04DPYR](https://flux.ai/lcsc/tpd1e1b04dpyr~990i.md)

- Part Type: ESD Protection Devices
- Manufacturer Name: TI\(德州仪器\)
- Manufacturer Part Number: TPD1E1B04DPYR
- Package or Case Code: X1SON\-2\_L1\.0\-W0\.6\-P0\.65\-BI\-1
- JLCPCB Part Class: Extended Part
- LCSC Part Number: C779408
- Role: RF ESD Protection
- Role Details: Antenna input ESD shunt
- Functional Group: RF Input and LNA

**Pins:**
- A [pin 2]
- C [pin 1]

### D2 — [SS14](https://flux.ai/jecstronic/ss14~ri4.md)

- Manufacturer Name: Slkor\(SLKORMICRO Elec\.\)
- Functional Group: Power Input and Buck
- Datasheet URL: https://datasheet\.lcsc\.com/lcsc/1912111437\_Slkor\-SLKORMICRO\-Elec\-\-SS14\_C444721\.pdf
- Part Type: Diode
- Role Details: 9 V battery reverse\-polarity series protection
- Role: Input Protection
- Manufacturer Part Number: SS14
- License: https://creativecommons\.org/licenses/by/4\.0/

**Pins:**
- Anode [pin A]
- Cathode [pin C]

### FL1 — CFUMT6\-45\.000\-F75IL03AL

- Role: First IF Filter
- Functional Group: First Mixer and 45 MHz IF
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/b55fbc4a6c6239a666edd05105a99629e7a8f3132b170750aa91e4ff19533deb\.pdf
- Part Type: EMI / RFI Components
- Mount: Through Hole
- Manufacturer Name: HCI
- Manufacturer Part Number: CFUMT6\-45\.000\-F75IL03AL
- Role Details: 45 MHz, 7\.5 kHz BW, 600 ohm termination
- Frequency: 45MHz

**Pins:**
- GND [pin 2]
- IN [pin 1]
- OUT [pin 3]

### FL2 — [SFECF10M7FA00\-R0](https://flux.ai/lcsc/sfecf10m7fa00-r0~n6wr.md)

- LCSC Part Number: C882431
- JLCPCB Part Class: Extended Part
- Manufacturer Part Number: SFECF10M7FA00\-R0
- Role Details: 10\.7 MHz, 280 kHz BW, 330 ohm termination
- Part Type: Ceramic Filters
- Role: Second IF Filter
- Package or Case Code: FILTER\-SMD\_6P\-L3\.5\-W3\.1\-P1\.28\-TL
- Functional Group: Second IF Filter
- Manufacturer Name: muRata\(村田\)

**Pins:**
- GND [pin 5]
- GND [pin 2]
- IN [pin 1]
- NC [pin 3]
- NC [pin 4]
- OUT [pin 6]

### J1 — [132255\-11](https://flux.ai/silicon-yard/132255-11.md)

- Role Details: Board\-edge 50 ohm SMA
- Part Type: Connector
- Manufacturer Name: Amphenol RF
- Manufacturer Part Number: 132255\-11
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role: RF Connector
- Datasheet URL: https://www\.amphenolrf\.com/en\-us/assets/file/4065786425/
- Connector Type: RF / Coaxial Connectors
- Functional Group: RF Input and LNA

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]
- 5 [pin 5]

### J2 — [132255\-11](https://flux.ai/silicon-yard/132255-11.md)

- Role: RF Connector
- Part Type: Connector
- Role Details: Board\-edge 50 ohm SMA IF output
- Manufacturer Name: Amphenol RF
- Functional Group: Second IF Amplifier and Output Pad
- Manufacturer Part Number: 132255\-11
- License: https://creativecommons\.org/licenses/by/4\.0/
- Datasheet URL: https://www\.amphenolrf\.com/en\-us/assets/file/4065786425/
- Connector Type: RF / Coaxial Connectors

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]
- 5 [pin 5]

### J3 — [B2B\-XH\-A\(LF\)\(SN\)](https://flux.ai/adrian95/b2b-xh-alfsn~5xx.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Role: Power Input Connector
- Role Details: Nominal 9 V battery input
- Manufacturer Name: JST Sales America Inc\.
- Datasheet URL: https://www\.jst\-mfg\.com/product/pdf/eng/eXH\.pdf
- Manufacturer Part Number: B2B\-XH\-A\(LF\)\(SN\)
- Functional Group: Power Input and Buck
- Symbol Style: parametric\-v1
- Part Type: Connector

**Pins:**
- P1 [pin 1]
- P2 [pin 2]

### J5 — [132255\-11](https://flux.ai/silicon-yard/132255-11.md)

- Part Type: Connector
- Manufacturer Name: Amphenol RF
- Manufacturer Part Number: 132255\-11
- Role: RF Connector
- License: https://creativecommons\.org/licenses/by/4\.0/
- Datasheet URL: https://www\.amphenolrf\.com/en\-us/assets/file/4065786425/
- Functional Group: First Mixer and 45 MHz IF
- Role Details: Board\-edge 50 ohm SMA LO1 input
- Connector Type: RF / Coaxial Connectors

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]
- 5 [pin 5]

### J6 — [132255\-11](https://flux.ai/silicon-yard/132255-11.md)

- Part Type: Connector
- Manufacturer Name: Amphenol RF
- Functional Group: Second Mixer and LO2 LPF
- Manufacturer Part Number: 132255\-11
- License: https://creativecommons\.org/licenses/by/4\.0/
- Datasheet URL: https://www\.amphenolrf\.com/en\-us/assets/file/4065786425/
- Role: RF Connector
- Connector Type: RF / Coaxial Connectors
- Role Details: Board\-edge 50 ohm SMA LO2 input

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]
- 5 [pin 5]

### LDO1 — [TPS7A2033PDBVR](https://flux.ai/lcsc/tps7a2033pdbvr~89ay.md)

- Datasheet URL: https://www\.lcsc\.com/datasheet/C2862740\.pdf?spm=wm\.sxq\.inf\.ggs&lcsc\_vid=FlkNBAIDRQULVABfFAVZBgZVFVZYBgZSQ1NeBVIFQlExVlNRTlhaVFZURllbUzsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D
- Manufacturer Name: TI\(德州仪器\)
- Functional Group: 3\.3 V and Negative Bias
- Role Details: 5\.3 V preregulator to 3\.3 V bias/control rail
- License: https://creativecommons\.org/licenses/by/4\.0/
- Package or Case Code: SOT\-23\-5\_L2\.9\-W1\.6\-P0\.95\-LS2\.8\-BR
- Manufacturer Part Number: TPS7A2033PDBVR
- LCSC Part Number: C2862740
- Role: 3\.3 V LDO
- JLCPCB Part Class: Extended Part
- Symbol Style: parametric\-v1
- Part Type: Power Management

**Pins:**
- EN [pin 3]
- GND [pin 2]
- IN [pin 1]
- NC [pin 4]
- OUT [pin 5]

### LDO2 — [TPS7A2050PDBVR](https://flux.ai/lcsc/tps7a2050pdbvr~xwcd.md)

- Manufacturer Name: TI\(德州仪器\)
- Manufacturer Part Number: TPS7A2050PDBVR
- Role: 5 V RF LDO
- Package or Case Code: SOT\-23\-5\_L2\.9\-W1\.6\-P0\.95\-LS2\.8\-BR
- Functional Group: 5 V RF Sequencing
- LCSC Part Number: C2864504
- Part Type: Linear Voltage Regulators \(LDO\)
- JLCPCB Part Class: Extended Part
- Role Details: Sequenced 5\.0 V RF rail from 5\.3 V preregulator

**Pins:**
- EN [pin 3]
- GND [pin 2]
- IN [pin 1]
- NC [pin 4]
- OUT [pin 5]

### TP1 — [S2761\-46R](https://flux.ai/silicon-yard/s2761-46r.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Datasheet URL: https://www\.harwin\.com/api/download/datasheet/S2761\-46R
- Role Details: Power and bias bring\-up measurement
- Manufacturer Name: Harwin Inc\.
- Manufacturer Part Number: S2761\-46R
- Functional Group: Power Test Points
- Role: Test Point
- Part Type: Test Point

**Pins:**
- \~ [pin 1]

### TP2 — [S2761\-46R](https://flux.ai/silicon-yard/s2761-46r.md)

- Role: Test Point
- License: https://creativecommons\.org/licenses/by/4\.0/
- Datasheet URL: https://www\.harwin\.com/api/download/datasheet/S2761\-46R
- Functional Group: Power Test Points
- Manufacturer Name: Harwin Inc\.
- Manufacturer Part Number: S2761\-46R
- Role Details: Power and bias bring\-up measurement
- Part Type: Test Point

**Pins:**
- \~ [pin 1]

### TP3 — [S2761\-46R](https://flux.ai/silicon-yard/s2761-46r.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Datasheet URL: https://www\.harwin\.com/api/download/datasheet/S2761\-46R
- Role: Test Point
- Manufacturer Name: Harwin Inc\.
- Manufacturer Part Number: S2761\-46R
- Functional Group: Power Test Points
- Part Type: Test Point
- Role Details: Power and bias bring\-up measurement

**Pins:**
- \~ [pin 1]

### TP4 — [S2761\-46R](https://flux.ai/silicon-yard/s2761-46r.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Datasheet URL: https://www\.harwin\.com/api/download/datasheet/S2761\-46R
- Role Details: Power and bias bring\-up measurement
- Functional Group: Power Test Points
- Role: Test Point
- Manufacturer Name: Harwin Inc\.
- Manufacturer Part Number: S2761\-46R
- Part Type: Test Point

**Pins:**
- \~ [pin 1]

### U\_BIASGOOD — [MCP6566T\-E\-OT](https://flux.ai/adrian95/mcp6566t-e-ot~45c.md)

- Part Type: Integrated Circuit
- Functional Group: 5 V RF Sequencing
- Role Details: Hold 5 V RF LDO disabled until negative gate bias is valid
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role: Bias Good Comparator
- Datasheet URL: https://www\.snapeda\.com/parts/MCP6566T\-E/OT/Microchip/datasheet/
- Manufacturer Name: Microchip Technology Inc\.
- Manufacturer Part Number: MCP6566T\-E/OT

**Pins:**
- IN\- [pin 4]
- IN\+ [pin 3]
- OUT [pin 1]
- VDD [pin 5]
- VSS [pin 2]

### U\_BUCK — [TPS62160DSGT](https://flux.ai/lcsc/tps62160dsgt~eqm.md)

- Part Type: DC\-DC Converters
- Package or Case Code: WSON\-8\_L2\.0\-W2\.0\-P0\.50\-TL\-EP
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role Details: 9 V battery to 5\.3 V preregulator
- Datasheet URL: https://www\.ti\.com/lit/ds/symlink/tps62160\.pdf?HQS=dis\-dk\-null\-digikeymode\-dsf\-pf\-null\-wwe&ts=1780562909788
- Role: Buck Preregulator
- Manufacturer Name: TI\(德州仪器\)
- Symbol Style: parametric\-v1
- Functional Group: Power Input and Buck
- LCSC Part Number: C2070772
- JLCPCB Part Class: Extended Part
- Manufacturer Part Number: TPS62160DSGT

**Pins:**
- AGND [pin 4]
- EN [pin 3]
- EP [pin 9]
- FB [pin 5]
- PG [pin 8]
- PGND [pin 1]
- SW [pin 7]
- VIN [pin 2]
- VOS [pin 6]

### U\_NEGCP — [TPS60403DBVRG4](https://flux.ai/lcsc/tps60403dbvrg4~pwn.md)

- Manufacturer Part Number: TPS60403DBVRG4
- Role: Negative Charge Pump
- Role Details: Generate negative gate\-bias source from 3\.3 V
- Manufacturer Name: TI\(德州仪器\)
- JLCPCB Part Class: Extended Part
- Part Type: DC\-DC Converters
- Package or Case Code: SOT\-23\-5\_L2\.9\-W1\.6\-P0\.95\-LS2\.8\-BR
- LCSC Part Number: C2070968
- Functional Group: 3\.3 V and Negative Bias

**Pins:**
- CFLY– [pin 3]
- CFLY\+ [pin 5]
- GND [pin 4]
- IN [pin 2]
- OUT [pin 1]

### U1 — [HMC8410LP2FETR](https://flux.ai/lcsc/hmc8410lp2fetr~201.md)

- Part Type: RF Amplifiers
- Role Details: 200\-240 MHz front\-end LNA, 5 V 65 mA
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2004261704\_Analog\-Devices\-HMC8410LP2FETR\_C514409\.pdf
- LCSC Part Number: C514409
- Package or Case Code: LFCSP\-6\_L2\.0\-W2\.0\-P0\.65\-TL\-EP
- Manufacturer Name: ADI\(亚德诺\)
- Manufacturer Part Number: HMC8410LP2FETR
- JLCPCB Part Class: Extended Part
- Functional Group: RF Input and LNA
- Role: Low Noise Amplifier
- Product Info Url: https://lcsc\.com/product\-detail/RF\-Amplifiers\_Analog\-Devices\-ADI\-HMC8410LP2FETR\_C514409\.html

**Pins:**
- GND [pin 7]
- GND [pin 1]
- NIC [pin 6]
- NIC [pin 3]
- NIC [pin 4]
- RFIN/VGG [pin 2]
- RFOUT/VDD [pin 5]

### U2 — [ADE\-1\+](https://flux.ai/mr-bammby/ade-1plus~5d.md)

- Role Details: 200\-240 MHz RF to 45 MHz IF with external LO1
- Part Type: RF Mixer
- Manufacturer Name: Mini\-Circuits
- Functional Group: First Mixer and 45 MHz IF
- Manufacturer Part Number: ADE\-1\+
- Datasheet URL: https://eu\.mouser\.com/datasheet/2/1030/ADE\-1\_2b\-1700151\.pdf
- Role: First Mixer

**Pins:**
- GND [pin 4]
- GND [pin 1]
- GND [pin 5]
- IF [pin 2]
- LO [pin 6]
- RF [pin 3]

### U3 — [GALI\-74\+](https://flux.ai/lcsc/gali-74plus~x7.md)

- Part Type: RF Amplifiers
- Package or Case Code: SOT\-89\-3\_L4\.5\-W2\.5\-P1\.50\-LS4\.2\-BR
- Role Details: 45 MHz IF gain stage
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2410010231\_Mini\-Circuits\-GALI\-74\-\_C879860\.pdf
- Role: First IF Amplifier
- Functional Group: First IF Amplifier and Pad
- Manufacturer Name: Mini\-Circuits
- Product Info Url: https://lcsc\.com/product\-detail/RF\-Amplifiers\_Mini\-Circuits\-GALI\-74\_C879860\.html
- Manufacturer Part Number: GALI\-74\+
- JLCPCB Part Class: Extended Part
- LCSC Part Number: C879860

**Pins:**
- GND [pin 2]
- RF\-IN [pin 1]
- RF\-OUT&DC\-IN [pin 3]

### U4 — [ADE\-1\+](https://flux.ai/mr-bammby/ade-1plus~5d.md)

- Part Type: RF Mixer
- Manufacturer Name: Mini\-Circuits
- Manufacturer Part Number: ADE\-1\+
- Functional Group: Second Mixer and LO2 LPF
- Datasheet URL: https://eu\.mouser\.com/datasheet/2/1030/ADE\-1\_2b\-1700151\.pdf
- Role: Second Mixer
- Role Details: 45 MHz to 10\.7 MHz conversion with 34\.3 MHz LO2

**Pins:**
- GND [pin 4]
- GND [pin 1]
- GND [pin 5]
- IF [pin 2]
- LO [pin 6]
- RF [pin 3]

### U5 — [GALI\-74\+](https://flux.ai/lcsc/gali-74plus~x7.md)

- Part Type: RF Amplifiers
- Role: Second IF Amplifier
- Functional Group: Second IF Amplifier and Output Pad
- Package or Case Code: SOT\-89\-3\_L4\.5\-W2\.5\-P1\.50\-LS4\.2\-BR
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2410010231\_Mini\-Circuits\-GALI\-74\-\_C879860\.pdf
- Manufacturer Name: Mini\-Circuits
- Role Details: 10\.7 MHz IF gain stage
- Product Info Url: https://lcsc\.com/product\-detail/RF\-Amplifiers\_Mini\-Circuits\-GALI\-74\_C879860\.html
- Manufacturer Part Number: GALI\-74\+
- JLCPCB Part Class: Extended Part
- LCSC Part Number: C879860

**Pins:**
- GND [pin 2]
- RF\-IN [pin 1]
- RF\-OUT&DC\-IN [pin 3]

*The full schematic, PCB layout, bill of materials, and interactive design are available at [https://flux\.ai/snowhill73/vhf\-double\-conversion\-downconverter\~n3](https://flux.ai/snowhill73/vhf-double-conversion-downconverter~n3).*

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*Generated from [https://flux\.ai/snowhill73/vhf\-double\-conversion\-downconverter\~n3](https://flux.ai/snowhill73/vhf-double-conversion-downconverter~n3)*