Vertical Card Compass Interference?

On Thursday, May 16, 2019 at 11:18:36 AM UTC-7, wrote:
On Thursday, May 16, 2019 at 10:46:29 AM UTC-4, Curt Lewis - 95 wrote:
Vertical Card Compass Interference?

I'm installing an LXNAV S100 top center in my panel with FLARM, ADS-B and GPS antennas at back/top of instrument shroud. I have a PAI-700 Vertical Card Compass mounted now on top of shroud about 2/3 back from front. As it sits now it would be only ~4" from antennas at rear. If you go by manufacturers' recommendations on anything electrical everything should be at least 3 feet from everything else .

1 - Does anyone have any empirical evidence of antenna interference specifically from this type of compass?

I could move the compass forward but it gets closer to the S100.

2 - Does anyone have any empirical evidence of Vario/Flight Computer interference from this type of compass?

Note: I am less concerned about the effect on the compass vs the compass effect on the other stuff

Thanks all.

Curt - 95

That compass is not an electronic device. It's just a swiveling magnet. Won't affect anything else.

Just curious, how many of you actually use a compass? I flying the mountains not flat land, but the only time I can remember referencing a compass was a vertical card to see the runway direction. I have two flux compasses in instruments and I tried to license the glider without, but one minimum equipment list.

Compass?Â* What's that?

On 5/18/2019 7:57 AM, Jonathan St. Cloud wrote:
On Thursday, May 16, 2019 at 11:18:36 AM UTC-7, wrote:
On Thursday, May 16, 2019 at 10:46:29 AM UTC-4, Curt Lewis - 95 wrote:
Vertical Card Compass Interference?

I'm installing an LXNAV S100 top center in my panel with FLARM, ADS-B and GPS antennas at back/top of instrument shroud. I have a PAI-700 Vertical Card Compass mounted now on top of shroud about 2/3 back from front. As it sits now it would be only ~4" from antennas at rear. If you go by manufacturers' recommendations on anything electrical everything should be at least 3 feet from everything else .

1 - Does anyone have any empirical evidence of antenna interference specifically from this type of compass?

I could move the compass forward but it gets closer to the S100.

2 - Does anyone have any empirical evidence of Vario/Flight Computer interference from this type of compass?

Note: I am less concerned about the effect on the compass vs the compass effect on the other stuff

Thanks all.

Curt - 95
That compass is not an electronic device. It's just a swiveling magnet. Won't affect anything else.
Just curious, how many of you actually use a compass? I flying the mountains not flat land, but the only time I can remember referencing a compass was a vertical card to see the runway direction. I have two flux compasses in instruments and I tried to license the glider without, but one minimum equipment list.

--
Dan, 5J

On Saturday, May 18, 2019 at 8:32:38 AM UTC-7, Dan Marotta wrote:
Compass?Â* What's that?
Dan, 5J

Reference standard for innacurate instruments.
Jim

my MEL does not reference a compass, but the factory does. ASW27 early model ser 31 Standard certification. I removed it and my AP/IA doesnt have an issue with it.

On Saturday, May 18, 2019 at 2:11:39 PM UTC-7, wrote:
my MEL does not reference a compass, but the factory does. ASW27 early model ser 31 Standard certification. I removed it and my AP/IA doesnt have an issue with it.

The operating manual for three gliders I've owned state that a compass is only needed for cloud flying.

Pretty sure you don’t need a compass in the US. Reality is if it’s a concern try the glider in various directions on the ground with the radios on and off. I don’t see it as a real problem flying gliders.