NTMS Proposed Schedule for Ham Radio Enthusiasts

Delve into the NTMS proposed schedule featuring topics like oscillators, oscillator characteristics, applications, 10 GHz examples, modern approaches, and available reference oscillators for VHF contests, antenna setups, and more. Explore the world of amateur radio and discover insights on stable oscillators, frequency modulation, and advanced electronics components.

• Ham Radio
• NTMS Schedule
• Oscillators
• VHF Contests
• Antennas

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Presentation Transcript

1. NTMS Proposed Schedule Month Topic Events April May SDR Sprints June Hamcom VHF Contest July 10 GHz Test Set Up August 10 GHz Contest, UHF Cotest VHF Contest, 2ndhalf 10 GHz September October Antennas Antenna November December Elections January FT Worth Hamfest VHF Contest SDR Update RPi

2. Oscillators March 7, 2020 Chuck Clark AF8Z

3. Oscillator Charasitics Stable .Don t change with time, or environment. Measured in parts per million, or parts per billion. Short term Long term Allan Variance. Accurate. Tolerance Is Accuracy NEEDED today?

4. Oscillator Applications.NTMS Up/down conversion from a higher frequency. Clock for our ADC/DAC in our SDR s

5. 10 GHz Example 10224 MHz ..102.24 MHz 7thOvertone, multiplied by 100 Or maybe 71 MHz. Lots of combinations but you need to keep harmonics of all the multipliers out of the 10368 MHz band. Need a custom crystal supplier. Each one is unique not temperature compensated. We could couple in a Thermistor and a varactor to try to get temperature effects reduced. This could be a lot of trial and error.

6. Modern Approach Use a ADF5355 or LMX2595 PLL with integrated VCO Double VCO, Fewer spurs . Many possible reference oscillators, TCXO, VCTCXO, OCXO. Absolute frequency reference nice but not required. Fractional modulus 274,877,906,944 238 That means 19.44*106/238 1.1587143 Hz steps, Hint ADIsimPLL Control with Rpi Zero or Ardunio. Major problem ..how to solder at home.

7. Available reference Oscillators TCXO CTS 520L15IA38M4000 38.4 MHz, 3.3V $3.28 single lot Mouser CTS520L15IA19M2000 19.2 MHz, 3.3V $3.28 +/-1.5ppm -40-+85C +/- 15.6 kHz at 10 GHz

9. Ovenized Abracom AOC2021XAJC-19.44, 10ppb, -20 to 70C $72.33 Microchip(Vectron) OX-511-EAE-2080-25M00 25 MHz, 20ppb $58.82 207 Hz @10368MHz