Kenpro KR-5400 Rotator Controller Repair

At out last balloon flight, I discovered two problems with the rotator system.  The Elevation Meter was intermittent, and tapping on it would make the reading fall to zero, and tapping again would bring it back to the correct position.  This didn’t seem to be affecting the automatic control.

I also found that the azimuth-right control was intermittent, and would not always move the rotor when pressed. This was definitely affecting the automatic control, as well as the manual control. I was able to recover each time by pressing the other controls for a short time, until the right rotation control worked again.

D18 Location

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ANSR-115/116 High Altitude Balloon Flight

On March 3rd, 2018, I helped out with the Arizona Near Space Research spring ASCEND flights.  Two high altitude weather balloons with payloads from several Arizona Colleges and Universities were launched from the parking lot of the grade school in Dateland, Arizona.

Inflating the balloon with helium

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Heathkit IG-42 Laboratory Generator – Initial Checkout

I hooked up the Heathkit IG-42 Signal Generator to the variac on the bench and brought the voltage up slowly, watching for signs of overheating or failed components.  There was a slight hum coming from the unit for the first couple of minutes, then it got better.  I suspect that the electrolytic capacitors were recovering after having not been in use for some time.

The IG-42 is rated for 100,000 uv output, with a 50 ohm output impedance.  To check this against a known good source, I set up my HP 8640B signal generator for 0.1 volt output into the 50 ohm terminated input of my scope.  0.1 volt = 100,000 uv.

8640B Check Scope Calibration

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Heathkit IG-42 Laboratory Generator – First Look

A friend and colleague of mine asked me to take a look at his Heathkit RF Signal Generator: IG-42.  The only information I got from him about it was that he had inherited it from a good friend, and had not had much luck using it.

Here we will make our initial inspection of the unit, and try to get a feel for what work might be needed to restore it to a useful condition.

Front View as received

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Heathkit C3 Condenser Checker – Wrapup

Finally, I just wanted to demonstrate the operation of the C3 Condenser Checker.  I’m not much of a videographer, but here is my video demonstrating the device to check several good and bad capacitors for value and leakage. Enjoy!

 

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