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Testing the BG7TBL GPSDO (and a couple of others)

July 16, 2022 n8ur Leave a comment

There has recently been quite a bit of discussion on the fmt-nuts mailing list about the BG7TBL GPSDO and whether…

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Posted in: GPS, Ham Radio, Test and Lab Equipment, Time and Frequency

GPS Antenna voltage and current requirements

n8ur Leave a comment

I am working on a current limiter circuit for a GPS antenna bias tee, and wanted to measure the minimum…

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Posted in: GPS, TAPR Projects, Test and Lab Equipment, Time and Frequency Filed under: Antenna, GPS

Allan Deviation — the Time-Nuts’ Statistic

February 4, 2022 n8ur 1 Comment

The essence of time-nuttery is measuring the stability of clocks and oscillators.  Allan Deviation (“ADEV”) is the statistic most commonly…

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Posted in: GPS, Test and Lab Equipment, Time and Frequency Filed under: ADEV, Frequency, PTTI, Time, time-nuts

PowerPole Color Conventions

October 5, 2019 n8ur Leave a comment

A lot of us use Anderson PowerPole connectors for DC power distribution. There’s a nearly universal standard to use red…

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Posted in: General, Ham Radio, SDR, Test and Lab Equipment, Time and Frequency Filed under: Cabling, DC Power, PowerPole, Wiring

GPS Survey — First Results

September 16, 2019 n8ur Leave a comment

Now that I have my GPS antennas permanently mounted on my tower, I’ve done a first set of measurements to…

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Posted in: GPS Filed under: GPS, NRCan, Opus, Survey

YU7WW Antenna Switch

September 13, 2019 n8ur 2 Comments

I’ve been looking for an antenna switching solution to use in my new ham station. I have several antennas for…

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Posted in: Ham Radio Filed under: Antenna, Antenna Switch, Ham Station

GPS Survey Antennas

June 30, 2019 n8ur Leave a comment

I’ve recently become interested in dual frequency GPS receivers – the kind the are used for land surveying and geodetic…

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Posted in: Uncategorized

USR-IOT Serial-to-Ethernet Converters with Linux

June 12, 2019 n8ur 2 Comments

I’m posting this mainly because Google didn’t turn up any help when I queried about using the USR-IOT serial port…

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Posted in: General, Networking, Test and Lab Equipment Filed under: ethernet, serial port, USR, USR-IOT, USR-N540, USR-TCP232

GPS Frequency Stability

April 8, 2019 n8ur Leave a comment

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…

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Posted in: GPS, Test and Lab Equipment, Time and Frequency

Mini-Circuits Power Amp

March 30, 2019 n8ur Leave a comment

Each year at the Dayton Hamvention, the folks at Mini-Circuits have a bunch of odds and ends they sell very…

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Posted in: Ham Radio, Test and Lab Equipment

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Recent Posts

  • Testing the BG7TBL GPSDO (and a couple of others)
  • GPS Antenna voltage and current requirements
  • Allan Deviation — the Time-Nuts’ Statistic
  • PowerPole Color Conventions
  • GPS Survey — First Results

Recent Comments

  • Hector on IC-7300 Power Overshoot?
  • Testing the BG7TBL GPSDO (and a couple of others) – John's Geekblog on Allan Deviation — the Time-Nuts’ Statistic
  • Tim on IC-7300 Power Overshoot?
  • n8ur on YU7WW Antenna Switch
  • ANTONIO DEMARINIS PY2YW on YU7WW Antenna Switch

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