Today's Message Index:
----------------------
1. 09:17 AM - VHF Interference With Wing Leveler (Charles Brame)
2. 10:45 AM - Re: VHF Interference With Wing Leveler (Robert L. Nuckolls, III)
3. 11:32 AM - Re: VHF Interference With Wing Leveler (Robert L. Nuckolls, III)
4. 11:37 AM - Re: VHF Interference With Wing Leveler (Joe Dubner)
5. 11:59 AM - Re: turn coordinator causing noise in headset (David Josephson)
6. 01:54 PM - Re: turn coordinator causing noise in headset (jerrytex)
Message 1
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| Subject: | VHF Interference With Wing Leveler |
I have a NavAid Wing leveler installed in my RV. Works as advertised
- most of the time. When I transmit on the radio (Apollo SL-60,) I
get a strong right turn input. The input ceases immediately and the
wings are abruptly leveled when the transmission stops. The radio
antenna is directly below the NavAid servo. The wires to the servo are
shielded. Is there any way to filter the interference?
By the way, the NavAid company is now defunct and not available for
support.
Charlie Brame
RV-6A, N11CB
San Antonio
Message 2
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| Subject: | Re: VHF Interference With Wing Leveler |
At 11:16 AM 10/23/2012, you wrote:
I have a NavAid Wing leveler installed in my RV. Works as advertised
- most of the time. When I transmit on the radio (Apollo SL-60,) I
get a strong right turn input. The input ceases immediately and the
wings are abruptly leveled when the transmission stops. The radio
antenna is directly below the NavAid servo. The wires to the servo are
shielded. Is there any way to filter the interference?
By the way, the NavAid company is now defunct and not available for
support.
I had some discussions with the original owner/designer
over this same issue about 15 years ago at OSH. He was
reluctant/unable to rise to the design goal of making
sure his product would perform as advertised in airplanes
with transmitters on board.
Shielded wire is of little if any value in fixing
an RFI issue. Filtering wires as they enter a shielded
environment on the potential antagonist or victim is
the time honored approach . . .
I don't recall when . . . or even if it happend on
this List . . . there was some discussion that I
think resulted in a successful 'fix'. Does
anyone else on the List recall?
Do you have schematics for the black-boxes?
Bob . . .
Message 3
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| Subject: | Re: VHF Interference With Wing Leveler |
At 12:44 PM 10/23/2012, you wrote:
<nuckolls.bob@aeroelectric.com>
At 11:16 AM 10/23/2012, you wrote:
I have a NavAid Wing leveler installed in my RV. Works as advertised
- most of the time. When I transmit on the radio (Apollo SL-60,) I
get a strong right turn input. The input ceases immediately and the
wings are abruptly leveled when the transmission stops. The radio
antenna is directly below the NavAid servo. The wires to the servo are
shielded. Is there any way to filter the interference?
By the way, the NavAid company is now defunct and not available for
support.
I had some discussions with the original owner/designer
over this same issue about 15 years ago at OSH. He was
reluctant/unable to rise to the design goal of making
sure his product would perform as advertised in airplanes
with transmitters on board.
Shielded wire is of little if any value in fixing
an RFI issue. Filtering wires as they enter a shielded
environment on the potential antagonist or victim is
the time honored approach . . .
I don't recall when . . . or even if it happend on
this List . . . there was some discussion that I
think resulted in a successful 'fix'. Does
anyone else on the List recall?
Do you have schematics for the black-boxes?
P.S. ==============================================
Text on page 11 of the installation manual found at
http://tinyurl.com/9xh5l6r
describes the function of a diode added to the PTT line
for a transmitter shown on page 9. This apparently serves
to 'lock up' the servo during transmit intervals thus preventing
the otherwise vulnerable servo from reacting to strong RF.
Bob . . .
Message 4
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| Subject: | Re: VHF Interference With Wing Leveler |
Charlie,
The NavAid wing leveler installation instructions show an optional diode and
connection to the com radio PTT. With them the A/P is disabled while the PTT is
depressed, allowing it to "do nothing" in the event of RFI.
NavAid manuals are available here:
http://www.porcine.com/gps/sc/ftp_manuals.html
--
Joe
Independence, OR
http://www.mail2600.com/cgi-bin/position.cgi?call=N821RP
Charles Brame wrote:
>
> I have a NavAid Wing leveler installed in my RV. Works as advertised -
> most of the time. When I transmit on the radio (Apollo SL-60,) I get a
> strong right turn input. The input ceases immediately and the wings are
> abruptly leveled when the transmission stops. The radio antenna is
> directly below the NavAid servo. The wires to the servo are shielded. Is
> there any way to filter the interference?
>
> By the way, the NavAid company is now defunct and not available for
> support.
>
> Charlie Brame
> RV-6A, N11CB
> San Antonio
>
>
>
>
>
Message 5
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| Subject: | Re: turn coordinator causing noise in headset |
>
> It seems like it is coming in through the antenna but why would turning the landing
> light on make it go away. Anyone have any ideas? Filter maybe?
You didn't mention whether the noise is there only when receiving a
signal or in your headset all the time. This is important. If it's only
when you're receiving a signal I would agree with Bob's suggestion that
it's radiated, and a filter would help. Turning the landing light on
probably drops the voltage sufficiently that the current spikes drawn by
the inverter in the t/c are significantly smaller than with the light off.
--
David Josephson
Message 6
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| Subject: | Re: turn coordinator causing noise in headset |
The noise is there always, regardless of transmitting or receiving. I can put my
headset on, turn on the master, listen to the gyro spin up in the headset, then
turn on the landing the light, and the noise goes away. Or I can disconnect
the antenna, and the noise goes away. I read on a yahoo group in which someone
else was having the same issue but there was no fix listed. I'll try the CAPACITOR
and if that doesn't work, I'll order the filter. Thanks for the responses.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=385882#385882
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