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Notebook of Time, Frequency,and Ham Radio Experiments

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General/Ham Radio/SDR/Test and Lab Equipment/Time and Frequency Cabling/DC Power/PowerPole/Wiring October 5, 2019October 5, 2019 by n8ur

PowerPole Color Conventions

A lot of us use Anderson PowerPole connectors for DC power distribution. There's a nearly universal standard to use red and black housings for 12 volt-ish (e.g., 13.8) lines, with the housings arranged per the "Orange County RACES Standard" like…

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GPS GPS/NRCan/Opus/Survey September 16, 2019September 16, 2019 by n8ur

GPS Survey — First Results

Now that I have my GPS antennas permanently mounted on my tower, I've done a first set of measurements to determine the precise antenna location. I collected data for 48 hours on three receivers (Trimble NetRS, Ashtech ZREF, and Ashtech…

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Ham Radio Antenna/Antenna Switch/Ham Station September 13, 2019July 1, 2020 by n8ur

YU7WW Antenna Switch

I've been looking for an antenna switching solution to use in my new ham station. I have several antennas for HF and 6M that all connect to the same amplifier in the shack, which has only a single output connector.…

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Uncategorized June 30, 2019 by n8ur

GPS Survey Antennas

I've recently become interested in dual frequency GPS receivers - the kind the are used for land surveying and geodetic research. More on that in another post. But along the way I've collected a whole bunch of antennas for these…

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General/Networking/Test and Lab Equipment ethernet/serial port/USR/USR-IOT/USR-N540/USR-TCP232 June 12, 2019June 12, 2019 by n8ur

USR-IOT Serial-to-Ethernet Converters with Linux

I'm posting this mainly because Google didn't turn up any help when I queried about using the USR-IOT serial port to ethernet converters (also known as terminal servers) with Linux. They make several low-cost devices that are really handy if…

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GPS/Test and Lab Equipment/Time and Frequency April 8, 2019May 8, 2019 by n8ur

GPS Frequency Stability

I couldn't find a nice graph showing the timing performance of a single-frequency, sawtooth-corrected, pulse-per-second output from a GPS. So I measured a CNS-II GPS Clock and a surplus telecom HP Z3805A GPS Disciplined Oscillator (GPSDO) against a high-performance Cesium…

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Ham Radio/Test and Lab Equipment March 30, 2019March 30, 2019 by n8ur

Mini-Circuits Power Amp

Each year at the Dayton Hamvention, the folks at Mini-Circuits have a bunch of odds and ends they sell very inexpensively. Over the years I've gotten tons of SMA attenuators and jumper cables, and a few amplifier blocks. I'd never…

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Test and Lab Equipment/Time and Frequency ADEV/BVA/Oscilloquartz March 25, 2019 by n8ur

Oscillator Aging Trends

It's well known that just about all oscillators drift, or "age", in frequency with time. In crystal oscillators, the most drift occurs when the oscillator is young, and over time the aging rate decreases. Power-cycling the oscillator results in a…

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Ham Radio/SDR FieldFox/Gnuradio/HamSci/USRP March 14, 2019March 14, 2019 by n8ur

Peak vs. Average Power in Complex Waveforms (and Gnuradio)

One of my Gnuradio projects is a tool that records IQ data covering 375 kHz -- which is enough to capture an entire HF ham band (except for 80/75M). A neat trick is to retransmit such a recording to allow…

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Test and Lab Equipment/Time and Frequency Frequency Standards/HP5065A February 27, 2019 by n8ur

HP 5065A Status

My faithful HP 5065A Rubidium standard, which had been converted to a "Super" model, developed an intermittent sickness and back it went to Corby Dawson for him to perform his magic.  After a realignment and fixing an intermittent connector ground,…

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