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Zenith CruZer & Sonex Logs
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Date: 2-9-2011
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Number of Hours: 1.00
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Manual Reference: aerovee
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Brief Description: Upper Mag Wiring / Battery Cable Fab
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Completed wiring the upper magnetron p-lead and ground connection. Worked the other night and it was quite frustrating.
For "run" operation, the p-lead is not grounded. To turn "off" the engine, you ground the p-leads, just like a regular certificated aircraft magneto. The easiest way for this is to use a shielded conductor - this way, in the "run"position, any RF energy radiated by the p-lead is grounded to the engine by the shield. When you turn "off" the mags, the shield is then grounded to the p-lead.
This wiring required about 4 tries with wasted terminals to finally get the lengths right, and to provide some stress relief with shrink tubing and electrical tape. Once this was done, I began stripping the insulation off the bottom magnetron p-lead, but will finish that up the next time I'm out in the shop. Extremely cold tonight - the low is supposed to be about 12 deg F. My propane heater only got the temp up to 50 F after two hours of burning. This may be nothing to you Northerners, but once you get used to the warmer climate, it's tough to face it!
Received the 5/16" battery cable terminal ends the other day, so I swaged them onto the cables - one end of each cable. I'm now done fabricating the cables. All 3 of these are ground cables - from the battery to the firewall ground block, from the starter mount to the firewall block, and from the other starter mount to the engine block. I should have a well-grounded system as a result.
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P-Lead and Ground
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Last of the Ground Cables
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