Today's Message Index:
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1. 07:47 AM - High pitch whine from KLN90 GPS (gmkonrad)
2. 03:10 PM - Re: EXP2BUS and non-functioning alternator (ianxbrown)
3. 03:26 PM - Re: Alternator excitation - suggested wiring? (mikef)
Message 1
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| Subject: | High pitch whine from KLN90 GPS |
I recently installed a KLN90 GPS (I know its old, but it is better than my old
loran) and it has a high pitch whine. I noticed the whine when I was wiring the
gps on the bench, thinking I would not hear the noise in the plane-wrong.
Would some kind of filter eliminate this or does it need to go to the shop ?
I can hear the whine thru the headsets also and it gets annoying. Any ideas ?
Thanks in advance,
Gary
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http://forums.matronics.com/viewtopic.php?p=244264#244264
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| Subject: | Re: EXP2BUS and non-functioning alternator |
I discovered that the IG lead to the alternator was only producing 12V when measured
disconnected. As soon as a load was applied that went down to 1.5V. It
turns out that some filings had got under the legs of an IRF4905 Mosfet and
seemed to have shorted the pins.
So, new question: Does anyone know how to test whether the cleaned up IRF4905
still works, and what the pinouts might be. There are three legs, but nothing
I've read tells me what leg does what. Would I have to remove the IRF4905 from
the board to test it's output?
Thanks for your help so far, which got me to this point.
Ian
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http://forums.matronics.com/viewtopic.php?p=244294#244294
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| Subject: | Re: Alternator excitation - suggested wiring? |
Bob,
I wanted to update you. After getting a new alternator plug that has the connections
I needed, I experimented and rewired the field and ground leads per your
suggestions.
WhaLa, alternator started outputting about 15 volts. Too high, but a few turns
of the LR3C regulator screw has it now outputing 14.2 volts. And if I move the
Master Switch to BATT position the alternator stops producing voltage. Like Hannibal
Smith always said: 'I love it when a plan comes together'.
I have a Z19 system, and here are the measured voltages from various instruments/locations:
Digital meter directly on the main battery: 14.23 v
Digital meter on the Z23 field wire to cockpit: 1.90 v
Digital panel Voltmeter on Ebus: 14.10 v
EM2 engine monitor connected to main bus: 14.44 v
Is that Z23/field voltage what you might expect?
Thanks again,
Mike
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http://forums.matronics.com/viewtopic.php?p=244296#244296
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