The Network Analyzer Terminal
(NAT) is a handheld graphic display terminal for controlling the
"Poor Ham's Scalar Network Analyzer" (PHSNA).
The NAT provides a convenient
alternative user interface for controlling the PHSNA and displaying its graphic
plots of Devices Under Test on a small graphic terminal,
instead of requiring connection to a PC for the user interface.
As the name
implies, the PHSNA is a tool for analyzing the frequency response
characteristics of hardware networks such as filters and
amplifiers. The NAT firmware has been developed to support and
enhance the PHSNA, as documented and discussed in the online Yahoo
Group found at:
The NAT handheld terminal may be
used with the PHSNA instrument simply by connecting the NAT's
serial port into the digital "UART" lines (Rx and Tx signals) of
the PHSNA's internal Arduino controller. Commands may then be
issued to the PHSNA, and data may be collected from the
instrument for display and analysis, similar to the way in which
the PHSNA uses the PC for its user interface ... only smaller and
The NAT pcb assembly may also be
built into an enclosure containing the PHSNA electronics (Arduino,
shield, and power detector), thus creating a completely
standalone instrument for the lab bench top.
We hope you all enjoy using the
Network Analyzer Terminal! We usually hang out in the
PHSNA Yahoo Group and we'd be happy to answer any questions or
field ideas for additional capabilities.
George N2APB & Dave AD7JT
NOTE ... The
SNA Kit is
The NAT has evolved now
to become the SNA (Scalar Network Analyzer),
additional capabilities for approximately the same price (plus a
DDS-60 siggen card).
If you already have a NAT, you can still manually upgrade it to
by following the information on this NAT website.
should be done at the
Slide Deck and
See how version 4 adds SNA (Scalar
Network Analyzer) capability!
Version 3 is available
Adds DDS-60 siggen RF output & RF Input.
Read all about the new capabilities here
Paper: SNA Calibration for
Use in Your Shack
the approach and benefits of the NAT-SNA Calibration process.
Handheld graphic terminal for display and control of the PHSNA
3.2 inch, 240 x 320, 16-bit color graphic LCD display w/touch
User-friendly operator interface
Field upgradable firmware
Serial port connection to PHSNA (digital UART 3.3V)
Keyboard input for control of SSNA menu system
32KB EEPROM for persistent storage of settings and options
14 Macros (in EEPROM) for storing operating parameters
PLX-DAQ (Excel) mode for test automation and PHSNA compatibility
Compatible with standard and enhanced PHSNA firmware versions
Simplified calibration (no curve fitting required)
Measurement & Plot Capabilities (v1.0):
and evaluating filters
- VSWR and
Continuous/repeated operation options
SD Card mass storage up to 1 GB provides:
file system compatibility
Subdirectory support for easy file management
spooling and playback
Calibration data storage and reloading
data exchange with Windows and Linux apps
- Easy and
efficient firmware upgrades
commands to manage and playback data files
4.82" x 3.77" x 1.39"
1.2 to 19.2 kbaud
12V DC @ 120ma (typ)
(330ma for NACT with DDS-60)