Today's Message Index:
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1. 10:45 AM - Transmit Noise (John Kenealy)
2. 11:40 AM - Re: Transmit Noise (Bruce Boyes)
3. 03:49 PM - Re: Transmit Noise (Doug McNutt)
4. 04:25 PM - Re: Transmit Noise (frequent flyer)
Message 1
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--> Avionics-List message posted by: "John Kenealy" <skortch@flashmail.com>
The tower at my home airport, KBMG often tells me Im "Garbled &
unreadable " I hear a tone in my headset when I transmit.(not feedback).
The other
day when I was calling for landing clearence I cut the power(throtled back)
and they
could understand me. When I am on the ground in taxi they have no
problem either. When the engine is off there is also no problem. I
bought an alternator filter and will install it soon. Any other
sugestions? It is starting to be really irritating after a beautiful
flight to have to deal with the negativity from the tower and the
frustration of the noise. I have a Narco MK 12D NAV/COM with GS.This
only hapens during Transmit. Is there a beter way to ground the radio? I
have replaced the PTT switch twice and
still no diff. Changed headsets no diff. HELP ! Thanks J T Kenealy
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Message 2
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| Subject: | Re: Transmit Noise |
--> Avionics-List message posted by: Bruce Boyes <bboyes@systronix.com>
At 11:10 AM 6/4/2004 -0700, John Kenealy wrote:
>--> Avionics-List message posted by: "John Kenealy" <skortch@flashmail.com>
>
>
>The tower at my home airport, KBMG often tells me Im "Garbled &
>unreadable "
My wife often tells me the same thing. The problem doesn't seem to exist
when communicating with other men.
>I hear a tone in my headset when I transmit.(not feedback).
I have the same problem, even when not wearing the headset. It's really
annoying at times, and frequently makes routine conversation difficult.
After some study, we have determined that this variable tone is in fact
emanating from our two children (ages 2 and 6).
I have not found a solution for either problem. Please advise if you do.
Best of luck,
Bruce
Message 3
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| Subject: | Re: Transmit Noise |
--> Avionics-List message posted by: Doug McNutt <douglist@macnauchtan.com>
At 11:10 -0700 6/4/04, John Kenealy wrote:
>--> Avionics-List message posted by: "John Kenealy" <skortch@flashmail.com>
>I hear a tone in my headset when I transmit.(not feedback).
Have a look at your alternator diodes. The three phase full wave rectifier will
typically produce an AC ripple of 6 X 400 =2400 Hz which is fairly easy to filter,
With one of six diodes failed the alternator will still work but will produce
ripple at 400 Hz which will change with engine speed.
440 Hz is one of the ways the A above middle C is tuned on a piano. Is that the
tome you hear?
A portable oscilloscope on the aircraft power bus should show six equal peaks but
will clearly show one or two bigger than the others if there is a bad diode.
--
--> There are 10 kinds of people: those who understand binary, and those who
don't <--
Message 4
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| Subject: | Re: Transmit Noise |
--> Avionics-List message posted by: frequent flyer <jdhcv@yahoo.com>
--- Doug McNutt <douglist@macnauchtan.com> wrote:
> --> Avionics-List message posted by: Doug McNutt
> <douglist@macnauchtan.com>
> --> There are 10 kinds of people: those who
> understand binary, and those who don't <--
And base 8 is just like base 10 provided you are
missing two fingers. ;<)
Jack
do not archive
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