Radio & Electronics
GPSDO Signal Distribution Board
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- Category: Radio & Electronics
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One of the important components of my GPS-disciplined oscillator project is the signal distribution board. The oscillator sends its pure signal through an isolation / buffer amplifier, then through an RF splitter. The splitter sends one copy of the signal to the digital control circuits and another copy to the distribution board.
iDEN Duplexer Teardown & Repair
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- Category: Radio & Electronics
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In this project, we open up a cavity duplexer from a Sprint / Nextel iDEN cellular repeater. We see the interior where all the black magic happens, attempt a repair and reassemble it against all odds of success.
More Repeater Details
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- Category: UHF Repeater
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I had a little time to open up the power amplifier today and snapped a couple of pictures.
Power Supply Test
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- Category: UHF Repeater
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Yesterday (8/28/14), I did a lot of testing on the repeater's power supply. It works! And in my usual style, I have lots of data:
UHF Repeater For WCARC
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- Category: UHF Repeater
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Thanks to a generous donation from W5JTT, the Wilson County Amateur Radio Club now has a UHF repeater! It is a high quality EF Johnson commercial machine and needs a little TLC before it goes on the air.
Subcategories
Lab Frequency Standard 1
This started as a quest to build an atomic frequency standard based on a rubidium oscillator. After realizing that I could get much better short-term stability and long-term accuracy by building around an ovenized crystal oscillator that's disciplined to a GPS time reference, the project was retargeted.