M0WWA Vector Network Analyzer

The Dual Detector VNA with Reflection Bridges

with optional Step Attenuator.

To build my N2PK Vector Network Analyzer I use the full set of PCB that VE3IVM, Ivan Makarov offers. Extensive documentation about his implementation of N2PK VNA can be found at http://www.makarov.ca/vna.htm

Two RF outputs ports, RF1 and RF2 (1Volts PP onto 50Ω) routed through low stray capacitance STS, sub miniature toggle switch.
Two Detector Input Ports, 1.2 Volts PP maximum onto 50Ω.
Connectors are protected with no short-circuited metallic dust caps.

Good decoupling and shielding techniques are applied.
Reflection Bridge A: Transformer coupling design for measurement covering the range of the instrument.
Reflection Bridge B: Balum coupling design improving its directivity, usable up to VHF region beyond the range of the instrument. Useful to measurement with other test sets.
Both assembled in Tin Plate enclosures providing more efficiency Faraday screening to electric and magnetic fields.

Deluxe Wooden Accessories Box included in the set.

The Vector Network Analyzer front view, new 4.3 version.

Rear view.

Screened 25 pins Sud-D Parallel Port panel plug.
Earth post.
Screened DC panel plug for power supply. 12Volts DC/500mA minimum.

The Vector Network Analyzer set.

OPTIONAL STEP ATTENUATOR

0 TO 71 dB step attenuator Ladder configuration.

Based on Minicircuits PAT+ series, wideband DC to 7GHz fixed ceramic attenuator cells, gives a precise reference of signal levels and improves matching between circuits.
Features 0dB to 71dB in 1 dB step attenuation through eight high quality low stray capacitance STS, sub miniature Toggle Switches, to switchover 1dB-2dB-3dB-5dB-10-dB-10dB-20dB-20dB.
Power Rating: 1Watt
Impedance: 50 Ohm.
External Dimensions: (H,W,D): 30x37x148mm.

Some plots using My VNA program software
by Dave Roberts G8KBB

Diamond W-8010 80m/40m/20m/15m/10m Trap Dipole Antenna plots.

Return Loss - VSWR

Zs - RL

BroadCast Band (BCB) Rejection Filter

MiniBridge Directivity (60KHz to 200MHz impedance bridge)

The SCR Preselector at 1.8MHz transmission plot

SOFTWARE

Some authors wrote code for N2PK Vector Network Analyzer.

Paul Kiciak, N2PK
Original software, updates and comprehensive technical information.
http://www.n2pk.com/VNA/VNAarch.html

My VNA by Dave Roberts G8KBB
Also he had designed an USB interface.
http://g8kbb.roberts-family-home.co.uk/html/n2pk_vna.html

VNA4win by Roger Blackwell, GM4PMK, and Ian White, GM3SEK.
http://www.marsport.org.uk/vna4win/index.htm

Exeter by Greg Ordy, W8WWV.
http://www.seed-solutions.com/gregordy/Software/Exeter.htm

IVMan Lite for N2PK VNA
A Windows GUI to display VNA DOS data files.
Extensive documentation about his N2PK VNA implementation.
http://www.makarov.ca/vna_ivmanlite.htm

Zplots Dan Maguire, AC6LA.
http://ac6la.com/zplots.html

WinVNA13 by Joakim Soya, OZ1DUG.
http://www.oz6frs.dk/2004/Projekter/Igang/N2PK/N2PK_VNA.htm

N2PK VNA YahooGroup.
A forum were friendly people aid builders and users of the N2PK VNA.
http://groups.yahoo.com/group/N2PK-VNA/

ASSEMBLY DETAILS.

The new 4.3 version main board.

Screen walls among detectors and DDS sections.
DDS ICs and Valpey-Fisher Master oscillator cover by heat sink

The VNA v4.3 with removed cover.

The VNA boxed in a Hammond extruded AL instrument enclosure model 1455T2201 (220mmx165mmx52mm).
The power supply is located in screened tin plate box. By-pass capacitors are used to decoupling power lines.
Slots on both side walls accept the mother board PCB.
Cabling are strongly decoupling with toroidal cores.
Rear panel more efficiently grounded to enclosure with earth strap.

VNA front panel

The RF routing switch is located inside the tin plated box to avoid RF leakage.
RF connections from/to switch box are done through SMA connectors.
No selected connection is termitated to 50 Ohms through the routing switch.
Front panel connectors are BNC Amphenol Precision Bulkhead Crimp jacks.
The panel is more efficiently grounded to enclosure with earth strap.

Reflection Bridge boxes

Both measurement bridges are assembled in 0.5mm. tin plated boxes. After punch both halves are soldered using Ag/Cu/Sn alloy to improve electrical connectivity.

Connectors assembly details

A thin copper sheet is placed between BNC connectors and box walls to seal any RF leakage.
The excess of copper is cut after fixing connectors.
To improve ground connectivity Brass Machine Phillips Pan Head Screws are used.

My version of N2PK Vector Network Analyzer

50KHz to 60MHz VNA

Dual Fast ADC Detectors and two Reflection Bridges.

Now new version 4.3

Since I introduced my assembled version of N2PK Vector Network Analyzer on my web site I received several inquires about the possibility of supplying it. After evaluation, I am offering the VNA totally assembled . It is made to order.

For details, please contact me.

The Dual Detector VNA with Reflection Bridges

with optional Step Attenuator.

To build my N2PK Vector Network Analyzer I use the full set of PCB that VE3IVM, Ivan Makarov offers. Extensive documentation about his implementation of N2PK VNA can be found at http://www.makarov.ca/vna.htm

Two RF outputs ports, RF1 and RF2 (1Volts PP onto 50Ω) routed through low stray capacitance STS, sub miniature toggle switch.
Two Detector Input Ports, 1.2 Volts PP maximum onto 50Ω.
Connectors are protected with no short-circuited metallic dust caps.

Deluxe Wooden Accessories Box included in the set.

The Vector Network Analyzer front view, new 4.3 version.

Rear view.

Screened 25 pins Sud-D Parallel Port panel plug.
Earth post.
Screened DC panel plug for power supply. 12Volts DC/500mA minimum.

The Vector Network Analyzer set.

OPTIONAL STEP ATTENUATOR

0 TO 71 dB step attenuator Ladder configuration.

Some plots using My VNA program software
by Dave Roberts G8KBB

Diamond W-8010 80m/40m/20m/15m/10m Trap Dipole Antenna plots.

Return Loss - VSWR

Zs - RL

BroadCast Band (BCB) Rejection Filter

MiniBridge Directivity (60KHz to 200MHz impedance bridge)

The SCR Preselector at 1.8MHz transmission plot

SOFTWARE

Some authors wrote code for N2PK Vector Network Analyzer.

ASSEMBLY DETAILS.

The new 4.3 version main board.

The VNA v4.3 with removed cover.

VNA front panel

Reflection Bridge boxes

Both measurement bridges are assembled in 0.5mm. tin plated boxes. After punch both halves are soldered using Ag/Cu/Sn alloy to improve electrical connectivity.

Connectors assembly details

A thin copper sheet is placed between BNC connectors and box walls to seal any RF leakage.
The excess of copper is cut after fixing connectors.
To improve ground connectivity Brass Machine Phillips Pan Head Screws are used.

Copper Beryllium alloy crinkle washers and brass nuts fix the connectors.

Bridge PCB assembly

The bridge PCB ground plane are soldered to box walls using Ag/Cu/Sn alloy.

My version of N2PK Vector Network Analyzer

50KHz to 60MHz VNA

Dual Fast ADC Detectors and two Reflection Bridges.

Now new version 4.3

Since I introduced my assembled version of N2PK Vector Network Analyzer on my web site I received several inquires about the possibility of supplying it. After evaluation, I am offering the VNA totally assembled . It is made to order.

For details, please contact me.

The Dual Detector VNA with Reflection Bridges

with optional Step Attenuator.

To build my N2PK Vector Network Analyzer I use the full set of PCB that VE3IVM, Ivan Makarov offers. Extensive documentation about his implementation of N2PK VNA can be found at http://www.makarov.ca/vna.htm

Two RF outputs ports, RF1 and RF2 (1Volts PP onto 50Ω) routed through low stray capacitance STS, sub miniature toggle switch. Two Detector Input Ports, 1.2 Volts PP maximum onto 50Ω. Connectors are protected with no short-circuited metallic dust caps.

Deluxe Wooden Accessories Box included in the set.

The Vector Network Analyzer front view, new 4.3 version.

Rear view.

Screened 25 pins Sud-D Parallel Port panel plug. Earth post. Screened DC panel plug for power supply. 12Volts DC/500mA minimum.

The Vector Network Analyzer set.

OPTIONAL STEP ATTENUATOR

0 TO 71 dB step attenuator Ladder configuration.

Some plots using My VNA program software by Dave Roberts G8KBB

Diamond W-8010 80m/40m/20m/15m/10m Trap Dipole Antenna plots.

Return Loss - VSWR

Zs - RL

BroadCast Band (BCB) Rejection Filter

MiniBridge Directivity (60KHz to 200MHz impedance bridge)

The SCR Preselector at 1.8MHz transmission plot

SOFTWARE

Some authors wrote code for N2PK Vector Network Analyzer.

ASSEMBLY DETAILS.

The new 4.3 version main board.

The VNA v4.3 with removed cover.

VNA front panel

Reflection Bridge boxes

Both measurement bridges are assembled in 0.5mm. tin plated boxes. After punch both halves are soldered using Ag/Cu/Sn alloy to improve electrical connectivity.

Connectors assembly details

A thin copper sheet is placed between BNC connectors and box walls to seal any RF leakage. The excess of copper is cut after fixing connectors. To improve ground connectivity Brass Machine Phillips Pan Head Screws are used.

Copper Beryllium alloy crinkle washers and brass nuts fix the connectors.

Bridge PCB assembly

The bridge PCB ground plane are soldered to box walls using Ag/Cu/Sn alloy.

Two RF outputs ports, RF1 and RF2 (1Volts PP onto 50Ω) routed through low stray capacitance STS, sub miniature toggle switch.
Two Detector Input Ports, 1.2 Volts PP maximum onto 50Ω.
Connectors are protected with no short-circuited metallic dust caps.

Screened 25 pins Sud-D Parallel Port panel plug.
Earth post.
Screened DC panel plug for power supply. 12Volts DC/500mA minimum.

Some plots using My VNA program software
by Dave Roberts G8KBB

A thin copper sheet is placed between BNC connectors and box walls to seal any RF leakage.
The excess of copper is cut after fixing connectors.
To improve ground connectivity Brass Machine Phillips Pan Head Screws are used.