# MLAT red **URL:** \ **Category:** ADS-B Flight Tracking\ **Created:** [February 15, 2020, 10:45pm UTC](https://discussions.flightaware.com/t/mlat-red/61007 "2020-02-15T22:45:25Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![VK2GEL](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/vk2gel/32/131524_2.png) [@VK2GEL](https://discussions.flightaware.com/u/VK2GEL)\ **Post date:** [February 15, 2020, 10:45pm UTC](https://discussions.flightaware.com/t/mlat-red/61007/1 "2020-02-15T22:45:25Z")
Hi my Pi2 has been stable but recently the MLAT button has been red intermittently and I have zero MLAT stats for the past 2 days. MLAT is enabled. Any thoughts please? ---
**Author:** ![chrislfa](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/chrislfa/32/113808_2.png) [@chrislfa](https://discussions.flightaware.com/u/chrislfa)\ **Post date:** [February 15, 2020, 11:08pm UTC](https://discussions.flightaware.com/t/mlat-red/61007/2 "2020-02-15T23:08:18Z")
Mouse over the red MLAT text; does it display any clues explaining what the issue is? ---
**Author:** ![VK2GEL](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/vk2gel/32/131524_2.png) [@VK2GEL](https://discussions.flightaware.com/u/VK2GEL)\ **Post date:** [February 15, 2020, 11:40pm UTC](https://discussions.flightaware.com/t/mlat-red/61007/3 "2020-02-15T23:40:20Z")
Hi it says disabled/not sync’d/lat long not set. How do I sync? ---
**Author:** ![abcd567](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/abcd567/32/113769_2.png) [@abcd567](https://discussions.flightaware.com/u/abcd567)\ **Post date:** [February 15, 2020, 11:44pm UTC](https://discussions.flightaware.com/t/mlat-red/61007/4 "2020-02-15T23:44:10Z")
You can’t synchronize yourself. It also says `/lat long not set`. If you set location correctly, FA server will synchronize automatically. # [For Beginners - How-to Set Receiver Location](https://discussions.flightaware.com/t/for-beginners-how-to-set-receiver-location/30277)     ---
**Author:** ![VK2GEL](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/vk2gel/32/131524_2.png) [@VK2GEL](https://discussions.flightaware.com/u/VK2GEL)\ **Post date:** [February 15, 2020, 11:51pm UTC](https://discussions.flightaware.com/t/mlat-red/61007/5 "2020-02-15T23:51:24Z")
I am getting this log mlat-client(3900): Server status: clock unstable ---
**Author:** ![abcd567](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/abcd567/32/113769_2.png) [@abcd567](https://discussions.flightaware.com/u/abcd567)\ **Post date:** [February 16, 2020, 1:53am UTC](https://discussions.flightaware.com/t/mlat-red/61007/6 "2020-02-16T01:53:26Z")
@VK2GEL Seems hardware issue at your end. Most likely Power Supply Unit. See these posts > [@Loss of MLAT due to Server Clock Instablitiy](https://discussions.flightaware.com/t/loss-of-mlat-due-to-server-clock-instablitiy/27989/5): > > Your receiver (I assume it’s 39602 you’re having trouble with) looks fine at the moment. > > There have been no server side changes recently, so it’s probably hardware problems on your side, perhaps temperature or RF noise related. > > I looked at some of the historical logs and your receiver has been flapping in and out of unstable for at least a couple of months. It’s got gradually more frequent over the last couple of weeks. Might be hardware on its way out. > [@Loss of MLAT due to Server Clock Instablitiy](https://discussions.flightaware.com/t/loss-of-mlat-due-to-server-clock-instablitiy/27989/6): > > I have had this before and it was solved by changing the power supply. I _believe_ the bad power supply was causing USB issues which would manifest itself in this error. > > Anyway, a new power supply, clock issues removed (for me) ### Also see this thread: [**Mlat-client clock unstable (only sometimes)**](https://discussions.flightaware.com/t/mlat-client-clock-unstable-only-sometimes/54403)   ---
**Author:** ![foxhunter](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/foxhunter/32/113733_2.png) [@foxhunter](https://discussions.flightaware.com/u/foxhunter)\ **Post date:** [February 16, 2020, 8:01am UTC](https://discussions.flightaware.com/t/mlat-red/61007/7 "2020-02-16T08:01:37Z")
The RPi uses a clock sync once a day (at least mine is doing it) maybe this is currently not working on yours ---
**Author:** ![wiedehopf](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/wiedehopf/32/114045_2.png) [@wiedehopf](https://discussions.flightaware.com/u/wiedehopf)\ **Post date:** [February 16, 2020, 9:59am UTC](https://discussions.flightaware.com/t/mlat-red/61007/8 "2020-02-16T09:59:30Z")
> [@VK2GEL](#): > > Hi it says disabled/not sync’d/lat long not set. Your stats show you had MLAT working in the past. Did you modify the location? An imprecise location is the most common cause for “unstable clock”. ---
**Author:** ![Humpfrey](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/humpfrey/32/125636_2.png) [@Humpfrey](https://discussions.flightaware.com/u/Humpfrey)\ **Post date:** [February 16, 2020, 11:54am UTC](https://discussions.flightaware.com/t/mlat-red/61007/9 "2020-02-16T11:54:04Z")
From the statistics page; Location Set: 22 January 2019 12:17 There are a few sites local to VK2GEL that report MLAT flights but don’t show MLAT as synchronised. Strange. ---
**Author:** ![VK2GEL](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/vk2gel/32/131524_2.png) [@VK2GEL](https://discussions.flightaware.com/u/VK2GEL)\ **Post date:** [February 21, 2020, 7:15am UTC](https://discussions.flightaware.com/t/mlat-red/61007/10 "2020-02-21T07:15:29Z")
Thanks all for your help. Rebooted and MLAT has been working for 2 days now. Will let you know if it stops again. G