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Messages - km4gig

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16
Electronic Video Blog / Re: Heathkit IG-1271 trouble shoot and repair video
« on: December 31, 2016, 02:13:46 PM »
Hey, Buddy,

I recently came across one of these myself and hooked it up to my scope. The square wave and triangle wave looks ok, but the sine wave is only rounded on the top side. The bottom is still a triangle. Looking at the partial manual that I have, it looks like D2-D7 make the top curve and D8-D13 make the bottom curve. What's the best way to go about troubleshooting this?

17
Electronic Video Blog / Re: #77 Shop Talk Build Your Own Test Gear
« on: December 24, 2016, 12:38:58 AM »
Hey Buddy,

On the demodulator probe, which diode did you use? The schematic is showing a 1n48, which doesn't seem to be available anymore.

18
Electronic Video Blog / Re: #83 Back to Basic Radio Troubleshooting
« on: December 10, 2016, 09:19:24 PM »
I used this video to help track down why a marine radio wouldn't power up. It turned out to be the switch, so I jumped across the terminals and she fired up. It makes noise and the buttons do stuff, so I guess I'll be buying a 10K switch pot and playing around with it. The only problem is I can't find any info on it anywhere. the front of the radio says unimetrics SeaHawk 88 and the back shows model no. SH 88. That's about all i can tell you about it.

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