Dx8, 3gx and two dsmx sats. I have random flashing lights.

[NoFixedAbode]

Hi all

I have changed my electricery now on my 550 running 3GX v3 on life with two dsmx sat bound to my dx8 in dsm2 mode.

The problem I am getting during bench test is random flashing light from sats. Either both solid, both flashing or one of each when I cycle power.

I have been Googling but there is so many problems with set up it seems.

Any thoughts? I take it it's not safe to fly?

[rapidgaz]

Dx8, 3gx and two dsmx sats. I have random flashing lights.

What's it like at first boot up and radios/tx first switch on.

[tomatwalden]

I thought a flashing sat light indicated that you haven't power cycled your TX since last connection ?

[Mark_T]

I thought a flashing sat light indicated that you haven't power cycled your TX since last connection ?

In DSM2 mode that would be correct.

if you power cycle the rx while the tx is still on the lights should be flashing on the satellites.

Turn off the rx, then turn off the tx.

Turn on the tx then turn on the rx and all should be solid.

[NoFixedAbode]

Re: Dx8, 3gx and two dsmx sats. I have random flashing lights.

Thanx Mark that cleared it. Off rx off tx. On tx on rx both solid.

I did not thought it mattered turning off tx!

When I turn off tx to test fail safe both sats off and all lights on 3gx flash. Turn on tx and both sats are solid but 3gx still light show.

Cycle rx/tx all 3gx and boths sats flash. Cycle second tine all is good.

Does that sound about right?

[tomatwalden]

Dx8, 3gx and two dsmx sats. I have random flashing lights.

Turning off the RX is seen as a loss of connection by the TX hence the warning flashing light.

[Mark_T]

If it helps for the future, this is what is happening.

With DSM2, when you turn on the TX it selects a pair of free channels at random, when you turn on the receiver it looks for a TX broadcasting its ID. The first place it looks is the previous two channels it connected on, if it finds the TX still using those channels it assumes that it must have lost connection and blinks the lights. If it doesn't find the TX there it goes looking across the rest of the channels until it finds the right TX and locks onto the two new channels.

This is also why this only works on DSM2 not DSMX.

[coolice]

Hey.

Just to add to what Marks already said, the 3GX has a safety/warning feature in that it will not bind on next power on if a power failure has occured. In this case all lights on the 3GX/sats flash and no radio connection is made to alert the pilot to a power supply or satellite problem on the model. Powering down and turning the model back on again, Tx on first then Rx, clears the warning.
.

[NoFixedAbode]

Re: Dx8, 3gx and two dsmx sats. I have random flashing lights.

Thanx for all you help guys. Just when you think you have this sport sussed it throws a curve ball at you

[iceuk]

When you bound the TX was the throttle at low, I have something similiar in the past where I bound TX to RX but throttle was not low, I could never get it to intialise afterwards as it always seen my throttle was not set to low, I would rebind and make sure you no trim on throttle and stick is low.

[NoFixedAbode]

Re: Dx8, 3gx and two dsmx sats. I have random flashing lights.

It's all done now. Basically it was user error. I did not know you had to power cycle rx AND tx. I have been using 3gx for about 8 months now and no probs but this is first time using it with to rx and 2 sats.