Network Analyzer Terminal - Scalar Network Analyzer

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Presentation transcript:

Network Analyzer Terminal - Scalar Network Analyzer NAT-SNA Network Analyzer Terminal - Scalar Network Analyzer Dave Collins – AD7JT George Heron – N2APB

Scalar Network Analyzer Poor Ham’s Scalar Network Analyzer (PHSNA) With Network Analyzer Terminal (NAT) TERMINAL (NAT) POWER READINGS (dB) < SERIAL INTERFACE > SCAN PARAMETERS LOGARITHMIC RF POWER METER (AD8307) POWER LEVEL ARDUINO-BASED MICROCONTROLLER FREQ DIGITALLY CONTROLLED SIGNAL GENERATOR (AD9850/51) RF OUT DEVICE UNDER TEST (DUT) RF IN https://groups.yahoo.com/neo/groups/PHSNA/info

Scalar Network Analyzer Features • Handheld graphic terminal for display and control of the PHSNA • 3.2”, 240 x 320, 16-bit color graphic LCD display & touch panel • 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 (settings and options) • 14 Macros (in EEPROM) for storing operating parameters • PLX-DAQ (Excel) mode for test automation and PHSNA compat. • Compatible with standard and enhanced PHSNA f/w versions • Simplified calibration (no curve fitting required) • Measurement & Plot Capabilities (v1.0):       - Testing and evaluating filters       - Measuring crystal parameters       - Return Loss Measurement       - VSWR and antenna tuning       - Continuous/repeated operation options • SD Card mass storage up to 1 GB provides:       - FAT16 file system compatibility       - Subdirectory support for easy file management       - Data spooling and playback       - Calibration data storage and reloading       - Direct data exchange with Windows and Linux apps       - Easy and efficient firmware upgrades       - DOS–like commands to manage and playback data files   Specifications PCB: 4.47" x 3.31" Enclosure: 4.82" x 3.77" x 1.39" Data rates: 1.2 to 19.2 kbaud Power: 12V DC @ 120ma (typ) (330ma for NACT with DDS-60) Weight: 7 oz (approx)

Scalar Network Analyzer Display module - under $20 on eBay: 240 x 320 Pixel (QVGA), 16-bit color, 3.2” LCD SSD1289 display controller Resistive touch screen with ADS7843 controller SD Card socket Pads and interconnect for serial (SPI) EEPROM Single, 40-pin interface connector

Scalar Network Analyzer Basic NAT Block Diagram (Versions 1 and 2)

Scalar Network Analyzer Menu Mode screen shots 1 ENTER CTRL-R

Scalar Network Analyzer PLX Mode screen shots Enter F1 SPACE

Scalar Network Analyzer DOS Mode screen shots Scroll Lock Escape touch touch Y

Scalar Network Analyzer Optional PC Application < SERIAL INTERFACE > Scalar Network Analyzer (SNA) RF IN RF OUT DEVICE UNDER TEST (DUT)

Scalar Network Analyzer NAT-SNA: NAT-Scalar Network Analyzer Block Diagram (Version 4)

Scalar Network Analyzer NACT to SNA conversion RF Power Meter by Dick Faust, K9IVB http://www.k9ivb.net/RF_Power_Meter/

Scalar Network Analyzer RF Power Meter Mode Primarily intended for QRP applications Power reading taken about 200 times/second (every 5 ms) 100 dBm range, use attenuators to shift the range DDS used only for calibration Three Power Meters Displayed Current power reading (10-point running average) Average Power (200-point running average) Peak Power (updated every 200 samples) P Ctrl-G Apply RF Scroll Lock

Scalar Network Analyzer Antenna analysis with Return Loss Bridge (RLB)

Scalar Network Analyzer Antenna analysis with Return Loss Bridge (RLB)

Scalar Network Analyzer Crystal Characterization & Matching

Scalar Network Analyzer Crystal Characterization & Matching (cont.)

Scalar Network Analyzer Crystal Characterization & Matching (cont.)

Scalar Network Analyzer References: http://www.midnightdesignsolutions.com/nat https://groups.yahoo.com/neo/groups/NAT-SNA/info https://groups.yahoo.com/neo/groups/PHSNA/info Dave ad7jt@dnbrealty.com and George n2apb@midnightdesignsolutions.com QUESTIONS? COMMENTS? CRITIQUES?

Scalar Network Analyzer Time for a little math Gain ratio = Pout/Pin Gain (dB) = 10 log(Pout/Pin) Gain (dBm) = 10 log(Pout/.001) = 10 log(Pout x 1000) = 10 (log(Pout) + log(1000)) = 10 log(Pout) + 30 Short circuit gain = 10 log(Pin/Pin) = 10 log(1) = 0 for any Pin Gain (dBm) = 10 log(Pin) - d where: Pin = power meter reading d = short circuit gain reading DDS output level varies with frequency (due to sin(x)/x sampling effect) therefore d is a function of frequency: d(f)