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.

Image Description
Image Description3024×4032 2.22 MB

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

7

Hi Marco good morning,

RadioMaster have agreed to replace the RP3-H for you, Unfortunately we are currently out of stock of that specific unit. So I can either send you a replacement we we receive new stock or I can issue you a refund for the RP3-H and you can use that towards something you would like to purchase. Realistically a replacement will take 3-4 weeks to arrive.

Let me know which you would prefer and I can action that for.

Hope this helps.

If there is anything else I can assist with please do let me know?

Regards,
David

Unmanned Tech Support

8

Hi David,

I am happy to wait for the receiver to be back in stock.

Thank you

Best regards,

Marco

9

Hi David,

I have never received the rp3h receiver.

Was everything ok with sending a replacement unit?

Thank you

10

Hi, good day Marco,

I’m really sorry for the delay here, I’m not sure why a replacement was not sent to you, but I see we have been struggling with stock on this specific item, I see very low stock levels for quite a few months now. Unfortunately we still don’t have stock on this item.

Can I refund you for the item? I see we do not have these on order so I am not sure when we might get them in again.

Please let me know how I can assist.

Regards,
David

Unmanned Tech Support

11

Hi Marco good day,

I just wanted to follow up on this for you?

Regards,
David

Unmanned Tech Support

12

Hi David,

Sorry for my late response.

Yes please refund the item if possible. If not it is ok

Thank you.

Best Regards,

Marco

13

Hi Marco good day,

Please can you register an account on our Shopify store and then I can get that refunded for you.

Apologies for the delay, I’m not able to complete the refund on the old system.

Regards,
David

Unmanned Tech Support

14

Hi Marco,

Just to clarify — because this order was placed some time ago, we’re no longer able to process a refund directly through our payment gateway.

We can instead:

  • Issue the refund as store credit (which can be used on any future order), or

  • Send the refund to you via PayPal.

If you’d like to go with PayPal, please reply with your PayPal email address so we can arrange the payment for you.

Let me know which option works best, and we’ll get it sorted promptly.

Kind regards, Alex Unmanned Tech Support

Join our community at dronetrest.com, or on Discord.

15

Hi Alex,

I have logged in correctly on the new site. I am more than happy with the store credits. I am sure I will be ordering more stuff.

Thank you.

Best Regards

16

Hi Marco good day,

I have loaded your store credit onto your new account, that can be spent on anything you like going forward and is valid for one calendar year from today, so it will only expire 17 September 2026.

Hope this helps.

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

Regards,
David

Unmanned Tech Support