Posts Tagged ‘Test Equipment’

2017 Superstition Hamfest Haul

The Superstion Hamfest had a very nice turnout this year, with seemingly quite a bit more used equipment for sale than the past few years.  I found a few bargains to add to my test bench. The first find was a Heathkit C3 Capacitor Tester.  I’ve been looking for an old style cap checker with […]

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Measuring Impedance

I saw a video today from one of the Youtube members that I subscribe to: Kevin Loughin KB9RLW.  In the video he was demonstrating how to use an oscilloscope and a signal generator to measure the impedance of a circuit ( in this case, it was simply a toroid coil).  The process made sense, but […]

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8640b Power Supply Repair

Early in the repair cycle of the 8640b, when I had just finished the brass gearset installation, I ran into a problem during the first power up after reinstallation of the deviation and range module.  When I powered up the unit, I saw a flash from under the main board, and the unit came up […]

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8640b Fine Tune Repair

Another item on the 8640b refurbishment project was the broken Fine Tune control.  I could rotate the control from the front panel, but it had no effect on the frequency generated. After removing the bottom cover, I could see the problem.  The Oscillator Module was missing the shaft that connected the fine tube knob with […]

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8640b FM Deviation Pot Repair

After replacing the gearset in my 8640b signal generator, the next item on the list was to repair the FM Deviation potentiometer, which had the shaft broken off where the knob would attach to the front. Since the pot is still electrically good, and I cannot locate another pot with the same value and length […]

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