Thursday, January 28, 2021

Using surplus GE Mastr II and Exec II transmitters as amateur radio beacon transmitters

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Back in 2000, a friend of mine (Glen, WA7X) wanted to place VHF and UHF propagation beacons at his cabin located in remote central Utah.  O...
Sunday, December 20, 2020

Locking the Icom IC-910H to an external 10 MHz (GPS) reference

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In late 2009 my friend Bryan, W7CBM, came to me with a project that he had in mind:  "Can we lock my Icom IC-910H to my 'Z-box'...
6 comments:
Tuesday, December 15, 2020

Intruder at the top of the 20 meter amateur band?

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It wasn't my intent to have this next post be about locating a source of a transmitter - but the temptation proved irresistible. Over th...
14 comments:
Tuesday, November 17, 2020

Interesting signals on the 20 meter band: Probable Radio Habana Cuba transmitter malfunction - not jamming

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 I happened to be looking at the various receivers at the Northern Utah WebSDR - as I'm wont to do (since I maintain them!) and noticed...
2 comments:
Saturday, November 14, 2020

A high-current DC (and AC) noise filter for UPS or RV use

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A friend of mine (Glen, WA7X) acquired a 16 kVA UPS (for free!) a year or so ago - a commercial system consisting of four hot-swappable 4 k...
Thursday, October 22, 2020

Using the jt9 executable to receive FST4W signals

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Note:   Since originally posted, WSJT-X v2.3.0-rc2 was released, adding a feature to the "JT9" executable that simplifies this p...
2 comments:
Saturday, September 26, 2020

Revisiting the "Limited Attenuation High Pass" filter - again.

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In several previous posts (See:  " A Limited Attenuation High Pass Filter " and " Revisiting the Limited Attenuation High Pas...