4 layers73.9 × 85.7 mm Vna2, the printed circuit board in 3D

Vna2

Second version of homemade 30 MHz - 6 GHz VNA

Size: 73.9 × 85.7 mm
Copper layers: 4
Thickness: 1.6 mm
Parts: 522
Nets: 426
Pads: 2,066
Tracks, vias: 8,004, 1,686
Pours: 69
Routed: Yes
KiCad: KiCad 5 (file 20170123)
Created: 13 Mar 2017
Updated: 23 Jan 2025

Overview

Vna2 is an open-source printed circuit board by Ttl, from the Ttl/vna2 repository on GitHub. It is a 4-layer board of 73.9 × 85.7 mm with 522 parts on 426 nets, routed with 8,004 tracks and 1,686 vias.

It is built around the PE42420F-Z, MAX2871ETJ+ and SKY13322-375LF, with the 3550LP14A300T, L7980 and TSV911ILT among its other parts. Its parts include 273 capacitors, 124 resistors, 28 connectors, 23 ICs and 20 fuses.

Main components

README

Second version of the homemade 30 MHZ - 6 GHz single receiver VNA design files.

First version: https://github.com/Ttl/vna

For more information see: http://hforsten.com/improved-homemade-vna.html

FPGA can be programmed with Openocd (http://openocd.org/). Scripts for programming the FPGA and SPI flash are in the "openocd" folder. Copy the bit file to openocd folder and use the command "openocd -f <script.cfg>" to program the board.

Before communication is possible with the board through USB, FT2232D EEPROM needs to be programmed. Port B needs to be changed in FIFO 245 mode. This can be done using FTDIs "ft-prog" tool.

Parts

522

Qty	Value	Footprint	References
62	100n	VNA:C_0402b	C2, C11, C16, C130, C131, C134, C136, C139, C141, C142, C148, C149, C165, C167, C173, C174 +46
30	10u	VNA:C_0805b	C100, C102, C103, C110, C111, C112, C113, C114, C116, C117, C118, C119, C137, C143, C230, C231 +14
23	100p	VNA:C_0402b	C22, C24, C25, C33, C34, C40, C43, C47, C105, C129, C132, C133, C135, C154, C156, C226 +7
22	1n	VNA:C_0402b	C5, C6, C10, C12, C28, C37, C38, C50, C52, C121, C151, C152, C179, C180, C255, C270 +6
21	18p	VNA:C_0402b	C35, C36, C54, C77, C128, C144, C146, C168, C169, C170, C171, C172, C175, C176, C177, C178 +5
20	1u	VNA:C_0603b	C13, C14, C15, C17, C19, C55, C56, C57, C217, C218, C222, C228, C229, C249, C257, C258 +4
20	Via	VNA:RF_via	F1, F2, F3, F4, F5, F10, F11, F12, F13, F14, F15, F16, F17, F18, F19, F20 +4
19	DNP	VNA:C_0805b	C53, C107, C158, C159, C163, C164, C262, C263, C264, C265, C266, C267, C268, C269, C271, C272 +3
17	100	VNA:R_0402b	R5, R7, R10, R49, R52, R53, R54, R55, R56, R59, R64, R65, R66, R90, R107, R122 +1
17	470n	VNA:C_0402b	C187, C189, C190, C191, C192, C193, C197, C198, C199, C200, C201, C202, C203, C204, C205, C250 +1
15	0	VNA:R_0402b	R12, R13, R14, R22, R23, R24, R28, R30, R31, R70, R87, R91, R93, R114, R116
12	BLM18PG181SN1D	VNA:C_0603b	FB1, FB2, FB3, FB4, FB5, FB6, FB7, FB8, FB9, FB10, FB11, FB12
11	10n	VNA:C_0402b	C3, C18, C60, C101, C104, C120, C147, C150, C153, C234, C235
11	CONN_01X01	VNA:TP_1.00	P3, P5, P9, P10, P11, P12, P13, P14, P15, P16, P28
11	DNP	VNA:C_0402b	C122, C123, C124, C125, C126, C127, C138, C161, C162, C259, C260
10	33	VNA:R_0402b	R16, R84, R85, R88, R105, R106, R119, R120, R131, R132
9	1k	VNA:R_0402b	R27, R40, R41, R42, R47, R50, R51, R61, R111
9	49.9	VNA:R_0402b	R6, R19, R20, R25, R26, R37, R38, R67, R68
8	DNP	VNA:R_0402b	R39, R69, R86, R92, R110, R113, R115, R121
6	10	VNA:R_0402b	R1, R2, R3, R4, R8, R9
6	10p	VNA:C_0402b	C92, C93, C97, C99, C115, C145
6	4.7u	VNA:C_0805b	C183, C185, C186, C188, C194, C195
6	CLIP	VNA:S2711-46R	P20, P21, P22, P23, P24, P25
6	PE42420	VNA:TFLGA-20	U6, U10, U11, U27, U28, U29
6	SMA	VNA:CONSMA003.062	P1, P2, P4, P6, P7, P8
5	10k	VNA:R_0402b	R48, R72, R73, R76, R95
5	4.7k	VNA:R_0402b	R71, R75, R112, R117, R118
4	240	VNA:R_0402b	R18, R36, R108, R109
4	33u (SRR6040A-330M)	VNA:SRR6040A	L4, L5, L9, L10
4	4.99k	VNA:R_0402b	R60, R62, R101, R103
4	L7980	Housings_DFN_QFN:DFN-8-1EP_3x3mm_Pitch0.5mm	U19, U20, U37, U38
4	SS13FL	VNA:SOD-123F	D1, D2, D3, D4
3	16k	VNA:R_0402b	R77, R78, R100
3	33p	VNA:C_0402b	C208, C209, C237
3	47u	Capacitors_SMD:C_1206	C182, C184, C196
3	68k	VNA:R_0402b	R32, R96, R98
3	LP5907-3V3	VNA:SOT-23-5	U4, U8, U36
3	MNT	VNA:MountingHole_3.2mm_M3_Pad_Via_mod	P17, P18, P19
2	0	VNA:C_0805b	L6, L7
2	1.8	VNA:R_0603b	R21, R89
2	12n	VNA:C_0402b	C31, C73
2	2.2u	VNA:C_0603b	C216, C220
2	27	VNA:R_0402b	R80, R81
2	3.3k	VNA:R_0402b	R43, R44
2	30.1	VNA:R_0402b	R17, R35
2	36p	VNA:C_0402b	C140, C236
2	4.7n	VNA:C_0402b	C108, C109
2	5.1k	VNA:R_0402b	R11, R29
2	50	VNA:R_0402b	R45, R46
2	820p	VNA:C_0402b	C32, C74
2	90.9	VNA:R_0402b	R15, R33
2	AISC-0603HP-R10J	VNA:C_0603b	L1, L12
2	C	VNA:C_0402b	C160, C166
2	LED	VNA:LED_0603	D5, D6
2	MAX2871	VNA:TQFN-32	U5, U9
2	SKY13322-375LF	VNA:MLPD-10	U13, U18
2	TP	VNA:TP_1.00	P26, P27
2	TRF37A75	VNA:DFN-8-1EP_2x2mm_Pitch0.5mm	U12, U26
2	TSV911	VNA:SOT-23-5	U22, U35
1	100u	Capacitors_SMD:C_1210	C181
1	15k	VNA:R_0402b	R99
1	16	VNA:R_0402b	R130
1	16n	VNA:C_0402b	C238
1	18n	VNA:C_0402b	C239
1	1M	VNA:R_0402b	R133
1	1k5	VNA:R_0402b	R82
1	1p	VNA:C_0402b	C157
1	1u	VNA:C_0402b	C1
1	2.5k	VNA:R_0402b	R104
1	220k	VNA:R_0402b	R74
1	220p	VNA:C_0402b	C155
1	22k	VNA:R_0402b	R94
1	2k2	VNA:R_0402b	R79
1	3550LP14A300	VNA:3550LP14A300	U16
1	470	VNA:R_0402b	R83
1	5515LP15A730	VNA:5515LP15A730	U14
1	59k	VNA:R_0402b	R34
1	6.8k	VNA:R_0402b	R57
1	680	VNA:R_0402b	R63
1	68p	VNA:C_0402b	C106

The 494 most common of 522 parts.

Questions

How big is the Vna2 PCB?

It measures 73.9 × 85.7 mm and has 4 copper layers, 1.6 mm thick.

What parts does the Vna2 use?

522 parts, built around the PE42420F-Z, MAX2871ETJ+, SKY13322-375LF and 3550LP14A300T. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Vna2 KiCad files?

From the Ttl/vna2 repository on GitHub, at the commit this page was made from: the board is hw/vna2.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the Vna2 design in my own project?

Its repository states no licence, so its author keeps all rights: ask Ttl before reusing the design.

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/ttl-vna2" title="Vna2 in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/ttl-vna2.jpg" alt="Vna2" width="1200" height="900">

A picture that opens the board, for a README

[![Vna2](https://pcbkit.io/embed/boards/ttl-vna2.jpg?size=s)](https://pcbkit.io/boards/ttl-vna2)

Source

Repository: Ttl/vna2
Board file: hw/vna2.kicad_pcb
Commit: 2cf0efb
Licence: Not stated

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