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

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Presentation on theme: "Network Analyzer Terminal - Scalar Network Analyzer Dave Collins – AD7JT George Heron – N2APB."— Presentation transcript:

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

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

3 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)

4 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 Basic NAT Block Diagram (Versions 1 and 2)

6 Menu Mode screen shots 1ENTER CTRL-R

7 PLX Mode screen shots F1Enter SPACE

8 DOS Mode screen shots Scroll Lock Escapetouch Y

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

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

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

12  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 Antenna analysis with Return Loss Bridge (RLB)

14

15 Crystal Characterization & Matching

16 Crystal Characterization & Matching (cont.)

17

18 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.comad7jt@dnbrealty.comn2apb@midnightdesignsolutions.com QUESTIONS? COMMENTS? CRITIQUES?

19  Time for a little math  Gain ratio = P out /P in  Gain (dB) = 10 log(P out /P in )  Gain (dBm) = 10 log(P out /.001) = 10 log(P out x 1000) = 10 (log(P out ) + log(1000)) = 10 log(P out ) + 30  Short circuit gain = 10 log(P in /P in ) = 10 log(1) = 0 for any P in  Gain (dBm) = 10 log(P in ) - d where: P in = 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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