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coop85(at)bellsouth.net
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 Posted: Mon May 29, 2006 12:19 pm Post subject: GRT / Radio interference |
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I have a Garmin 480 and SL-30 in my RV-10 running to a bent whip antenna =
on
the bottom and a copper foil antenna on the roof. Anytime I transmit on =
the
bent whip antenna (regardless of radio, I tried swapping things around), =
the
Grand Rapids EFIS displays and Engine monitor get very unhappy. The EIS
displays bad data and the EFIS pitches up and banks heavily. There =
doesn't
appear to be any impact on the Dynon EFIS. I'm using RG-400 cable to =
the
antennas and am using the fuselage as the ground plane. The antenna is
mounted between the spar sections (ie just aft of the instrument panel =
but
on the bottom of the fuselage).
=20
Any suggestions/thoughts would be much appreciated.
=20
Marcus
=20
Do not archive
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Tim(at)MyRV10.com
Guest
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| Posted: Mon May 29, 2006 2:39 pm Post subject: GRT / Radio interference |
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I'm no expert here, but have you checked out your GRT system to make
sure it's got great grounding, free of ground loops, and nice wire
runs? It seems like this could really be a not so much related to your
antenna choice, but to something on the GRT wirirng not being up to par.
I'd check the entire wire run, and make sure you have shielded wire on
any of your signal wires, and make sure that one end, and only one end
of the wire shield is grounded. I'd think that if this were all true,
your chance of radiated problems like this would be reduced. Keep us
posted when you find the solution...it could be interesting.
Tim Olson - RV-10 N104CD - Flying
do not archive
Marcus Cooper wrote:
| Quote: |
I have a Garmin 480 and SL-30 in my RV-10 running to a bent whip antenna =
on
the bottom and a copper foil antenna on the roof. Anytime I transmit on =
the
bent whip antenna (regardless of radio, I tried swapping things around), =
the
Grand Rapids EFIS displays and Engine monitor get very unhappy. The EIS
displays bad data and the EFIS pitches up and banks heavily. There =
doesn't
appear to be any impact on the Dynon EFIS. I'm using RG-400 cable to =
the
antennas and am using the fuselage as the ground plane. The antenna is
mounted between the spar sections (ie just aft of the instrument panel =
but
on the bottom of the fuselage).
=20
Any suggestions/thoughts would be much appreciated.
=20
Marcus
=20
Do not archive
|
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N777TY
Joined: 09 Apr 2006
Posts: 69
Location: Charlotte, NC
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| Posted: Mon May 29, 2006 5:15 pm Post subject: Re: GRT / Radio interference |
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Something similar in a friend's -7.. EIS would reboot when hitting PTT. It turned out to be wire routing... play with it a bit... separate coax from other stuff... move it away etc..
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RV-7A
N777TY |
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brian
Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA
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| Posted: Mon May 29, 2006 6:16 pm Post subject: GRT / Radio interference |
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On May 29, 2006, at 1:12 PM, Marcus Cooper wrote:
| Quote: |
<coop85(at)bellsouth.net>
I have a Garmin 480 and SL-30 in my RV-10 running to a bent whip
antenna =
on
the bottom and a copper foil antenna on the roof. Anytime I
transmit on =
the
bent whip antenna (regardless of radio, I tried swapping things
around), =
the
Grand Rapids EFIS displays and Engine monitor get very unhappy.
The EIS
displays bad data and the EFIS pitches up and banks heavily. There =
doesn't
appear to be any impact on the Dynon EFIS.
|
Troubleshooting EMI (electromagnetic interference) to non-radio
devices is always a crap shoot. The first thing I would check is to
verify that the shield for the comm antenna cable is intact. Next
check to make sure that the base of your comm antenna is well bonded
to the aircraft skin. Those are likely to be the two biggest problems.
If those don't work you might try putting bypass capacitors right at
the power input of the GR boxes.
See what happens with that.
Brian Lloyd 361 Catterline Way
brian-yak AT lloyd DOT com Folsom, CA 95630
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
Antoine de Saint-Exupry
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_________________
Brian Lloyd
brian-yak at lloyd dot com
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery |
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