Curious about what the “10 MHz” connector on the back of your test equipment is? Interested in calibrating an SDR to reduce tuning error? Do you want an accurate frequency source for tuning radios? How about a super accurate sense of what time it is? This week, Dr. Frank Howell K4FMH joins Jeremy and George to talk about GPS Disciplined Oscillators and Frequency References for your workbench.

News

Hurricane Watch Net - https://www.hwn.org/
Icom IC-9700 - http://qrznow.com/icom-ic-9700-vhfuhf1-2ghz-prototype-transceiver-shown-at-tokyo-hamfair-2017/
Circuit Board Printer - Voltera - https://www.voltera.io/
Circuit Board Printer - BotFactory - https://www.botfactory.co/page/homepage

Workbench

KF7IJZ’s Workbench

Remote Airspy Server w/ ASUS Tinkerboard
- Airspy SDR Receivers
- - Airspy R2 - 24Mhz - 1.8Ghz 10Mhz Bandwidth SDR Receiver - $169 - https://v3.airspy.us/product/a-airspy/
  - Airspy Mini - 24Mhz - 1.8Ghz 6Mhz Bandwidth SDR Receiver - $99 - https://v3.airspy.us/product/a-airspy-mini/
  - SpyVerter HF Converter - $49 - https://v3.airspy.us/product/a-spyverter/
- ASUS Tinkerboard
- - I Used a Tinkerboard because I had one, but I would recommend an ODroid device instead - http://www.hardkernel.com/main/main.php
  - Tinkerboard Hardware - https://www.asus.com/us/Single-Board-Computer/Tinker-Board/
  - Tinkboard Linaro Linux Distro available on that page under Downloads
  - Armbian Distro for Tinkerboard - https://www.armbian.com/tinkerboard/
  - Good review of Tinkerboard - https://forum.armbian.com/index.php?/topic/4614-asus-tinker-board/
- Software
- - Spyserver for ARM 32 Bit - http://airspy.com/download/
  - Airspy on ARM Instructions (do this first) - http://photobyte.org/running-spyserver-raspberry-pi-3/
Arduino MIDI Mute Button
- Hardware
- - Adafruit Pro Trinket 5V - https://www.adafruit.com/product/2000
  - Adafruit 24mm LED Arcade Buttons - https://www.adafruit.com/product/3430
  - Adafruit MIDI Jack - https://www.adafruit.com/product/1134
- Arduino MIDI Wirting and Communication Guide - https://www.arduino.cc/en/Tutorial/Midi
- Use “Debounce” Example code from Arduino IDE
- Arduino MIDI Message Guide (code is deprecated, but message formats are relevant)- http://little-scale.blogspot.com/2011/08/simple-examples-of-sending-midi-data.html
- Eagle Best Practices
- - 1/16” Margin around the edge of the board
  - Avoid acute angles on circuit traces
  - Vias should be at least 0.04” in size
  - Traces should be at least 0.03” in size
  - Keep good space between signal lines and ground planes/traces
Other Links
- Perseus SDR - http://microtelecom.it/perseus/
- SDR Console Software - http://sdr-radio.com/Software/Download1/Download
- RF Space - http://rfspace.com/RFSPACE/Home.html
- Cloud SDR - http://www.cloud-sdr.com/
- SDR# Tuner from Mouse - https://www.rtl-sdr.com/building-a-tuning-knob-for-sdr/

KJ6VU’s Workbench

RIDGID Toolbox for KX3 Project - http://www.homedepot.com/p/RIDGID-22-in-Pro-Organizer-Black-222571/205440492
BBC Micro:Bit - http://microbit.org/

K4FMH’s Workbench

Trimble based GPS GPSDO 10Mhz / 1PPS Clock - http://www.ebay.com/itm/Trimble-GPS-Receiver-GPSDO-10MHz-1PPS-GPS-Disciplined-Clock-sine-and-square-wave-/252162780444?hash=item3ab612ad1c:g:o2IAAOSw1WJZHdMY
PCTEL GPS (L1) 26dB Timing Antenna Kit - http://www.ebay.com/itm/PCTEL-GPS-L1-26dB-TIMING-ANTENNA-KIT-GPS-TMG-26N-W-Mount-Kit-/263159662203?epid=1209248913&hash=item3d4589c67b:g:KU0AAOSw8gVX3BPx
Six Output Video Distribution Amplifier - Sigma Electronics VDA-100A - https://www.ebay.com/sch/i.html?_odkw=SIX+Output+Video+Distribution+Amplifier+Sigma+Electronics+VDA-100A&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR0.TRC0.H0.XSigma+Electronics+VDA-100A.TRS0&_nkw=Sigma+Electronics+VDA-100A&_sacat=0
Leo Bodnar Precision 2 Output GPSDO (450Hz - 800Mhz) - https://v3.airspy.us/product/lb-gpsdo-1/
HP 3586A Selective Level Meter - http://ve2zaz.net/HP3586_AD5962/HP3586_AD5962.htm

Show Links

HRWB032-Frequency References with Dr. Frank Howell K4FMH 03:15:05 Share

Ham Radio Workbench Podcast

Shownotes Transcript

HRWB032-Frequency References with Dr. Frank Howell K4FMH