Transmitter ringing like doorbell and no apparent reason

[aliraminghe]

I have a cockpit sx 9 v1.4 and flying a glider with no mixes, only vario telemetry
Suddendly the transmiiter started ringing like din-din-din din-din-din for a few times, then stopped
After landing with no issues I checked the display but nothing, transmitter battery was over 2600 mAh remaining. Following flight no sound and no issues.
Any ideas?
Thanks for any suggestion
Carlo

[AndreasJ]

It is always the same, THe powersupply of your receiver dropped down somehow whilst your flight. The Battery symbol was surly blinking after your flight at the transmitter as well.
If the voltage drops down somehow bewlow 4.5V (adjustable at the receiver with the Multiplex Launcher) an alarm signal will be generatet at the Transmitter.

[aliraminghe]

thanks Andreas for your reply, but I'm not an idiot, I'm asking help because there was no led blanking at the transmitter

[Roland]

It looks like your battery voltage drops down during flight. So you get the alarm. There are two possibilities, voltage or lqi. So far, lower voltage alarm temporarily at the receiver setup to check, e.q. exclude voltage alarm.
If you think you are a idiot, don't ask, if not, friendly accept hints.

[aliraminghe]

Thanks Roland for your attention and patience. As I wrote before there was no receiver low battery led flashing on the transmitter. Receiver is a 7 DR so full telemetry.
To check anyway I have connected the receiver to the Multiplex launcher to see the error count: the counter says zero signal and zero voltage errors. The receiver has been installed only on this glider.
In the following flight after the issue I checked LQI and it was always 100%.
So it seems a problem of the transmitter, maybe transmitter battery? I bought transmitter in 2017. There is a similar alarm for low transmitter battery? Now is says almost 6 hours remaining, but could be something going wrong?

[Roland]

Reduce alarm of voltage at receiver! You should remind if receiver restarts, error count will be reset. That means, no errors in counter. (Bu you can store them with set button)

[aliraminghe]

receiver usually is buried in the glider fuselage, so the set button is not available. I still have a #85048 cable that solved this issue with the old synth receivers.Do you kindly know if I can put this cable to the B/D connector of the 7 dr receiver to have both led and set button available on the glider cockpit?

[Roland]

Reduce alarm of voltage at receiver!

With Launcher, as you did.

[macsimu]

85048 cable

I can't imagine that this would work. As far as I know, the cable is for the IPD receivers and for 35 MHz.
Greetings macsimu

[macsimu]

receiver usually is buried in the glider fuselage, so the set button is not available

For all receivers that are installed inaccessibly, I have provided an extension cable that is accessible on the receiver from B/D to the front of the fuselage.
This means that I only need to update with the launcher and the receiver is ready to bind again.
Of course, I have to take the fuselage to the PC or the laptop to the fuselage. But it's still better than removing the receiver and almost breaking my fingers with the set button.
Of course, this only works with receivers that can be updated via the launcher.
Greetings macsimu

[aliraminghe]

@macsimu
after Roland suggestions I have done the same, adding an extension cable from the B/D port to the cockpit, even if this means you need a laptop at the flying site to live read receiver errors.
I have asked to the Multiplex support about the 85048, but due to holydays still waiting for the final answer.
Greeting Carlo

[profimc]

Hi, out there!

The MPX #85048 cabel only works with old MHz-Synth-RXs. It is useless for M-LINK-RXs and therefore no longer available, in production respepectively.

So long
profimc

[Roland]

If you insist on storiing the error in receivers memory, you can use after the flight the set button as described in the manual..... no need of specific cable

[aliraminghe]

Now I have moved the receiver to the cockpit, protecting it with foam that leaves a slot to see led and set button.
the receiver manual says: If you press the SET button for the purpose of saving the error count, the stored information is retained until the next time you save the error count.
So next time I see receiver led blinking for errors I can store and see.