Garmin GTX 335 question

[Scott MacMoyle]

I normally fly with the transponder showing ALT and 1200. It flashes R after the 1200. I assume thats normal. Is it recieving or replying ? also is it normal to get the no 1090 es TX message when at low altitude ? I check my flights on flightaware and it shows its being recived by dozens of ground stations along the way,

Thanks
Scott

 

[luvflyin]

I normally fly with the transponder showing ALT and 1200. It flashes R after the 1200. I assume thats normal. Is it recieving or replying ? also is it normal to get the no 1090 es TX message when at low altitude ? I check my flights on flightaware and it shows its being recived by dozens of ground stations along the way,

Thanks
Scott

Both. It has to be interrogated before it replies.

 

[GeorgeC]

The R means the transponder is replying to an interrogation.

also is it normal to get the no 1090 es TX message when at low altitude ?

No. I do a lot of low and slow flying and have never seen this message. Keep in mind that flightaware has their own receivers. Have you gotten a recent PAPR?

 

[Scott MacMoyle]

I got a report when I did the install. All was good but that was about 18 months ago. Maybe another test is in order. I didn’t replace the coax cable with RG400. Garmin makes a big deal about that. I was skeptical but maybe it would help.

Thanks for the replies.