Digital altimeters

Isn't the altitude display in the TT22 corrected to 29.92" Hg?

During wave flights and high thermal days, I use local field altimeter
setting on the baro altimeter.Â* At 17,900' MSL indicated I generally see
about 17.7 on the Trig.Â* I do NOT push up to 17.9 on the Trig given my
pressure altimeter will read around 18,200'.Â* I just don't need that
extra altitude at the risk of a call/letter/visit from FSDO.

On 6/3/2018 10:01 AM, JS wrote:
On Sunday, June 3, 2018 at 6:13:25 AM UTC-7, wrote:
On Saturday, June 2, 2018 at 2:13:38 PM UTC-7, wrote:
Tried of the 57mm Winter altimeter being too inaccurate even after being re-calibrated. Being EXPERIMENTAL, going to look into digital.

Going to look at MGL Vega ASV-1 first as it displays altitude and airspeed. http://www.mglavionics.com/html/vega_color_singles.html

Anyone had experience with this specific make/model?
Its hard to find specific guidance for instruments in experimental gliders within the maze of FAA regulations, but as a practical matter, I found my Winter compact altimeter calibration was inadequate for safely flying close to restricted airspace, even after factory recalibration, so I took it out and use my CAI and LX altimeters, which have excellent calibration.
I use a calibrated Winter 57mm altimeter and regularly fly near or in Restricted airspace. The ALT display in the TT22 is a more important thing there.
Jim

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Dan, 5J

On Sunday, June 3, 2018 at 7:05:10 AM UTC+1, 2G wrote:
On Saturday, June 2, 2018 at 10:26:53 PM UTC-7, Ross wrote:
Why not simply go to Air Avionics?
It is a fully TSO altimeter.

https://www.air-avionics.com/

Enjoy

The ACD-57 is about twice the price of the MGL and lacks an ASI.

Tom

It may be more expensive than the MGL unit but the fully certified AIR display (including altimeter activation fee) is slightly cheaper than a Winter altimeter - and there is the option of using the display to also control a compatible radio and transponder all from one 57mm hole.

On Sunday, June 3, 2018 at 9:34:16 AM UTC-7, wrote:
On Sunday, June 3, 2018 at 7:05:10 AM UTC+1, 2G wrote:
On Saturday, June 2, 2018 at 10:26:53 PM UTC-7, Ross wrote:
Why not simply go to Air Avionics?
It is a fully TSO altimeter.

https://www.air-avionics.com/

Enjoy

The ACD-57 is about twice the price of the MGL and lacks an ASI.

Tom

It may be more expensive than the MGL unit but the fully certified AIR display (including altimeter activation fee) is slightly cheaper than a Winter altimeter - and there is the option of using the display to also control a compatible radio and transponder all from one 57mm hole.

Which would be attractive if you have, as I do, a certified glider. Being certified, however, does not necessarily mean the instrument will be better, more reliable, more accurate, etc. The digital altimeter is, most likely, more reliable and accurate than the certified mechanical altimeter.

Tom

Use caution with the Air Avionics transponder if you need ADSB out. Last time I checked their transponder is not capable of a SIL-1 or SIL-3 level output.

ATC sees only your Trig altitude , not your altimeter, never the less, probably prudent not to bust an IFR altitude with your calibrated altimeter.

Trig will not share communication code with AIRAvionics therefore ACD-57 will not operate a Trig COM or XPDR.

IMO, the 57mm Winter altimeter is a waste of money and panel space.The MGL Vega instruments are said to have good visibility in bright sunlight. I think it is worth a try but first would like to see one powered. Maybe at Oshkosh.

On Sunday, June 3, 2018 at 12:49:25 PM UTC-7, wrote:
Trig will not share communication code with AIRAvionics therefore ACD-57 will not operate a Trig COM or XPDR.

IMO, the 57mm Winter altimeter is a waste of money and panel space.The MGL Vega instruments are said to have good visibility in bright sunlight. I think it is worth a try but first would like to see one powered. Maybe at Oshkosh.

A marketing decision by Trig and in my opinion a bad one. The ACD-57 will control a Becker radio, and better than Becker's own front end. Surely it would be better than the Trig too, if Trig would only see the light.

I have altitude from the Air Vario, the CN Vario, the Trig, the iPhone, the inReach, and finally the Winter steam gage. It would be nice to get rid of the steam gage.

So...Â* You're never really quite sure of your actual altitude then. Or
do they all say the same thing?

On 6/3/2018 3:16 PM, jfitch wrote:
I have altitude from the Air Vario, the CN Vario, the Trig, the iPhone, the inReach, and finally the Winter steam gage. It would be nice to get rid of the steam gage.

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Dan, 5J