Today's Message Index:
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1. 07:35 AM - Re: Re: Broadcast Radio Bleedover on Transceiver (Robert L. Nuckolls, III)
2. 08:26 AM - Re: Re: Over Voltage on Start Up (Robert L. Nuckolls, III)
3. 10:12 AM - Re: Over Voltage on Start Up (dbarnes)
4. 09:34 PM - Re: KT 76 Installation Manual (mariasam)
Message 1
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Subject: | Re: Broadcast Radio Bleedover on Transceiver |
At 03:18 PM 9/2/2013, you wrote:
>
>Seems to be coming through from the headsets. It's not near as bad
>when I disconnect the co pilots headset. I wonder if an external
>ground to the intercom box would help.
ADDING grounds almost never helps . . . getting all
the existing grounds in the RIGHT place may have
a profound difference.
This sounds like a classic AM demodulation condition
common to many audio systems with poor ground
architecture or even vulnerable audio inputs.
Does it happen at other locations or just your
home airport? Is there a high power AM broadcast
station nearby?
Bob . . .
Message 2
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Subject: | Re: Over Voltage on Start Up |
At 11:15 AM 9/2/2013, you wrote:
>
>Starting at the battery a #2 cable goes to the inside of the fire
>wall to a plate with a field of spade connectors then through a 5/16
>inch brass bolt to the engine side of the firewall to another field
>of spade connectors and also to one of the starter mounting bolts
>through a large braided cable. The regulator is on the engine side
>of the firewall and gets its ground from one of the spade
>connectors. Originally I had the sense line of the regulator hooked
>to a dedicated output from vertical power. In trying to solve this
>problem I moved it to the battery positive bolt on the firewall
>(through a small fuse). At first it seemed to solve the problem but
>the charging voltage was too low. When I adjusted higher I was back
>to the same problem.
>
>I am going to the hanger this pm and will try an alternate ground to
>the engine block and extend wires into the plane to measure the
>sense voltage and compare it to the vp displayed voltage.
Very good. Your ground system appears righteous. But
there's something going on that confuses or fools
the regulator's otherwise clear view of the universe.
Bob . . .
Message 3
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Subject: | Re: Over Voltage on Start Up |
Bob,
I tested the voltage on the sense terminal to the ground terminal on the regulator.
It seemed to match the display on the vertical power. They both measured
over 30 volts. The io-550 uses a direct drive alternator. I didn't have an
additional ground wire on it so I added that. I took a #8 wire from the case
ground to the engine block. Another plane I looked at had that so I added it.
No change. Any chance the regulator is seeing too much ac from the alternator
and it is confusing it? I have read in the car world that leaky, open, shorted
diodes sometimes cause strange problems.
Thanks,
Dan Barnes
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=407985#407985
Message 4
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Subject: | Re: KT 76 Installation Manual |
Seems to be coming through from the headsets. It's not near as bad when I disconnect
the co pilots headset. I wonder if an external ground to the intercom box
would help. :P [Laughing]
--------
maria
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=407997#407997
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