Batteries and brownouts

[wouldbeflyer]

Can any body tell me why my AR 7200 's sat is flashing as if in brownout,when a fresh battery is connected,and before I have done anything.It stays flashing even in use Is it tied up with hold.

[woodsta888]

Did the sat manage to bind as well as the AR7000? I noticed that I can bind my AR8000 butthe sat wont sometimes. Have to move my TX until they both pick up the bind signal. I'd rebind and watch the lights and ensure you get a full bind on both receivers.

[Grumpy]

The short answer: It's because you are using DSM2 mode and you didnt turn the Tx off and on again when you changed flight batteries.

The long answer: In DSM2 mode the Tx picks two random frequencies each time you turn it on, and it uses only those two frequencies to communicate with the Rx for that session. If the Rx is turned off it 'remembers' the frequencies that the Tx was using. When the Rx is turned on again, if it detects the same two frequencies it 'assumes' it's only been off momentarily and that there has been a brownout, so it flashes the LEDs. Bear in mind that the receiver has no real way of knowing if it's been 'off' for a millisecond or an hour, so detecting the frequencies is the best it can do.

If you use DSMX mode then there is no flashing LED to indicate brownout, so you wont get the same thing if using DSMX.

[tomatwalden]

As per Grumpy's answer - is your sat DSMX or DSM2 ?

[wouldbeflyer]

Hi,I don't know. I thought they did it together.I just had another look at it and as I moved the wire it fell out of the 7200 .Now it won't stop blinking.Before that I checked the voltage while moving the sticks for 4 minutes and it stayed at 5 volts,thats without motor though
Martin

[wouldbeflyer]

Hi, its a very good answer and yes ,I am using DSM2.I have a dsmx but don't understand or know what mode it should be on so not used it.Just found the sat lead almost out as well.Not good
Martin

[Grumpy]

You should use DSMX if you can, it's the newer and more robust protocol. You may have DSM2 set in your Tx, otherwise it should bind in DSMX by default.

Having said that, under 99.9% of all flying conditions DSM2 is fine. The blinking LED after you change a battery in DSM2 is (as explained above) just a false alarm, it wont effect radio reliability in any way.

[wouldbeflyer]

Ok thanks to you for your help.I felt a bit worried as I had a problem with the 7200 but its fine now and with this resolved ,hopefully I can enjoy it .You are right,I missed it about false alarm.Silly ol s... So much to learn yet i have had loads and loads of Horizon kit.
Cheers
Martin