Order #UT-708933 - Radiomaster Rp3-H Expresslrs Receiver - Ticking Noise like a clock whilst on

Help Unmanned Tech
1

Order Number: UT-708933
Product Name: Radiomaster Rp3-H Expresslrs Receiver
Brand: RadioMaster
As soon as I power the receiver on there is a strong ticking/clicking noise coming from the receiver.
It is mounted on a helicopter and it seems to work on the bench. It connects to the nomad and the servos and motor move fine. However, I’m nervous of taking it to the field and losing the connection as soon as there is a bit of distance between us.
It is my first elrs receiver, but I have never seen any video or comments about noise coming from the receiver.

Is that a normal behavior of this receiver?
I have tried with my previous receiver and the noise was not present. Also, If I unplug the cable the noise stops and the helicopter failsafe.
The noise seems to come from the receiver.

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2

Hi Marco good day,

I completely agree with you, your RX should not be making a noise, and risking a brownout on a heli is absolutely not worth it.

Can I ask how you are powering the RX, and if the voltage is within the spec for the unit?

I’ll get RM involved and get his resolved for you as quick as I can.

Regards,
David

Unmanned Tech Support

3

Hi David,

The receiver is connected to the sbus connector of an OMP M2 Evo which supplies 5V. The connector also has the data and ground line. I left the Rx pin disconnected as the sbus does not use it.

The battery sensing pin is connected to the input xt30 and it uses 3s batteries, so it should be within spec

Thank you

Marco

4

Hi good morning Marco,

I sent through all your information and asked RadioMaster’s technical team to assist.

As soon as I hear back I will let you know.

If there is anything I can help with please do let me know.

Regards,
David

Unmanned Tech Support

5

Good morning Marco,

I have been speaking with RM, they have requested some additional information which I have sent through to them.

As soon as I hear back I will let you know.

I do apologies for the delay.

Regards,
David

Unmanned Tech Support

6

Hi David,

Thank you for the update.

I look forward to Radio masters response.

Best regards,

Marco