Trigg- TT 22 problem

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Hi, I have Trigg- TT 22 installed this spring and after about 70 flight hours I am getting warning message on display : WARNING DPSK UNLOCK. After pressing ENT button normal 1202 squawk reappears for about only a minute . Public ADS-B performance report from my flight is fine. Anyone had similar warning? What does DPSK stands for? There is no help in user manual on this issue. Thank you. Pavel

[Darryl Ramm]

On Monday, September 2, 2019 at 5:52:00 PM UTC-7, wrote:
> Hi, I have Trigg- TT 22 installed this spring and after about 70 flight hours I am getting warning message on display : WARNING DPSK UNLOCK. After pressing ENT button normal 1202 squawk reappears for about only a minute . Public ADS-B performance report from my flight is fine. Anyone had similar warning? What does DPSK stands for? There is no help in user manual on this issue. Thank you. Pavel

DPSK would mean Different Phase Shift Keying, which is the data modulation used in Mode-S transponders to generate the message packets.

To me "Unlock" makes it seem more likely a internal clocking or digital related problem. Lik

Trig has pretty responsive customer support, through Mid Continent in the USA and email support from Trig HQ. In this case I suspect you'll need to get the unit to Mid Continent for some quality time on a repair bench.

https://www.mcico.com/medias/Trig%20Avionics_Transponders%20and%20Comm%20Radios .pdf

[Darryl Ramm]

s/Different/Differential/

[[email protected]]

Thank you very much , I will check all cables and connections again before sending unit to service center.