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Network Analyzer Terminal - Scalar Network Analyzer

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Presentation on theme: "Network Analyzer Terminal - Scalar Network Analyzer"— Presentation transcript:

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

2 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

3 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 120ma (typ) (330ma for NACT with DDS-60) Weight: 7 oz (approx)

4 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

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

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

7 Scalar Network Analyzer
PLX Mode screen shots Enter F1 SPACE

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

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

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

11 Scalar Network Analyzer
NACT to SNA conversion RF Power Meter by Dick Faust, K9IVB

12 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

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

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

15 Scalar Network Analyzer
Crystal Characterization & Matching

16 Scalar Network Analyzer
Crystal Characterization & Matching (cont.)

17 Scalar Network Analyzer
Crystal Characterization & Matching (cont.)

18 Scalar Network Analyzer
References: https://groups.yahoo.com/neo/groups/NAT-SNA/info https://groups.yahoo.com/neo/groups/PHSNA/info Dave and George QUESTIONS? COMMENTS? CRITIQUES?

19 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)


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