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Vector Network Analyzer model

                   VNA UHF

Vector
       Network
        Analyzer


(a VNA 2180 is pictured in the case)

 

The VNAuhf is a Vector Network Analyzer for measuring impedance (magnitude and phase) and filter transmission in the range of 5 KHz to 1 GHz.

A PC is used to plot parameters, such as: Impedance, SWR, Return Loss, S21 and S11.

The test frequency is generated digitally.

An analog to digital converter digitizes the raw data. This avoids non-linearity associated with diode detectors, and results in very good dynamic range and linearity for accurate magnitude and phase measurements.

 

Main Features:

bulletPort A is equivalent to an antenna analyzer. (Similar to the AIMuhf).
bulletPort B has a 50 ohm input impedance with return loss greater than 20dB.
bulletPort B nominal dynamic range: 90 dB up to 200 MHz, 70 dB up to 500 MHz, 60 dB up to 1 GHz.
bulletProgrammable RF amplitude for Port A (-13 to -33 dBm).
bulletResistance and reactance measurements of antennas and discrete components.
bulletTransmission measurements through filters or networks.
bulletMarkers for impedance scans and Smith charts.
bulletParameters that can be plotted include:
bulletResistance and reactance for series or parallel equivalent circuits.
bulletImpedance magnitude and phase angle.
bulletSWR
bulletReturn loss
bulletTwo port network transmission (S21, magnitude and phase).
bulletS11 and S21 can be plotted at the same time.


 

bulletCable length, impedance, loss, and velocity factor
bulletDistance to fault (open or short)
bulletTDR (Time Domain Reflectometry) plots
bulletSmith chart displays (featuring phase rotation and zoom)
bulletBand scan to check for interfering signals
bulletQuartz crystal parameter measurements
bulletPreprogrammed functions, such as tuning a WL stub, and many more
bulletI/O expansion port for accessories (digital and analog)
bulletCalibration loads are included
bulletNo internal adjustments
bulletOptically isolated USB interface to PC

Impedance measurements can range up to 10K ohms. The sign of the phase angle indicates either inductive or capacitive reactance without ambiguity.

The RF generator can also be used as a signal source for testing receivers. The frequency is very stable and it can be calibrated to WWV.

Digitized data is sent to the PC via an optically isolated USB port. Power for the VNAuhf can be obtained from a small DC power supply or a battery. With a laptop computer, the unit is quite small and portable. Measurements can be made at ground level and translated as if they were at the antenna feedpoint by using the refer to antenna function.

The impedance at the antenna itself can be read with the VNAuhf located in the shack at the receiving/transmitting end of the coax. The cable can be any length. The cable's impedance and loss characteristics are determined by a simple calibration procedure and the antenna's impedance is then plotted directly during the scan.

Numeric values can be read from the graph data using the mouse-controlled cursor.

The scan data can be saved to disk or printed to compare before and after results. It can also be imported into spreadsheet programs for further analysis.

Note -  CIRCUITS AND PROCEDURES used by this antenna analysis system are covered by US Patent No. 7,629,795

 

 

70cm Notch Filter 
VNAuhf scan of a 70cm Notch Filter made with an Open Stub of RG316 coax

 

COMPARISON WITH THE VNA2180

The VNAuhf is not a replacement for the VNA2180. The VNA2180 will continue in production.

Parameter VNAuhf VNA2180
Frequency Range 5 kHz to 1 GHz 5 kHz to 180 MHz
Output signal into 50 ohms 0.035 Vrms (-13dBm) 0.5 Vrms (+7dBm)
Max interference input
while measuring
0.1Vrms (-7dBm) 1.4 Vrms (+16dBm)
Programmable output level Yes Yes
Two ports for filter testing Yes Yes
Program port for accessories Yes Yes
Antenna & component testing Yes Yes

Trace overlays of a Cellular duplexer measurement with an HP8722 VNA and the VVN uhf

VNA uhf Return loss in blue. S21 (transmission gain) in Green

8722 Return loss in purple.  S21 (transmission gain) in light purple

 

 

The VNAuhf is now available and includes calibration loads, cables and a power supply for 120V operation.

The VNAUHFDX is also available, but with a "global power supply" for use outside North America.

 

Buy it now on our secure shopping cart

We DO NOT ship a software CDROM with the analyzer.

Get the Software Here >  http://w5big.com/vnauhf.htm

We DO NOT ship a software CDROM with the analyzer.

Analyzer and technology used is Patented