I have had two of these. The unshielded antenna portion (clear) literally falls off without touching , engine on. Why is this happening?

This should not be happening. Spektrum's QA has always been hit or miss. I would definitely return them for either a refund or a replacement.

I got a t-rex 150x dfc set coming and wanting to make sure this is all i should need to fly with my dx6e radio?

maybe not, if it come with the FBL is microbeast then you need a special cable and update the firmware, better option buy the regular DSMX satellite receiver

How to you connect this to the rx2 on a fc6250hx? the supplied cable is 4 strand and the plug doesn't fit the 3 prog rx2 plug on the 6250

The 4 pins on the SRXL2 would need to be put on to the appropriate 3 pin connector. Flite Test has a video on how to do this for their Aurora 5 flight controller. The video is on you tube, just search for "Aura SRXL2 Setup and SRXL2 Telemetry Tuning".

How do you know if it works? No lights come on.

Lights must come on. - blinking . . . before binding. If the plane is upside down, you will not get lights. Level the plane and then red the instructions. Then if nothing happens, its a bad receiver.

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Spektrum SRXL2 DSMX Remote Serial Telemetry Receiver, SPM4651T

Product ID: 337867014

Details

Brand
Spektrum
Colour
Black
Compatible devices
Spektrum
Max number of supported devices
8
Special features
SRXL2

📡20 channels SRXL2 serial data

📶Dual diversity antennas for max signal

🔋Wide 3.3v-8.4v voltage input

Description

🚀 Elevate your flight game with Spektrum’s next-gen SRXL2 receiver!

PLUG AND PLAY BINDING - Simplify your setup with a built-in bind button—no extra bind plugs needed, get flying faster.
DUAL DIVERSITY ANTENNAS - Maximize signal strength and reliability even in challenging environments with carbon fiber or metal shielding.
BLAZING FAST SRXL 2 PROTOCOL - Experience ultra-responsive control with up to 20 channels of lightning-fast serial telemetry.
EXTENDED CONTROL LINK RANGE - Low Noise Amplifier technology ensures interference-free, long-distance connectivity for your flights.
COMPACT LIGHTWEIGHT DESIGN - At just 22.7g, it’s perfectly engineered for Heli, Multi-Rotor, and FPV pilots who demand agility.

The Spektrum SRXL2 DSMX Remote Serial Telemetry Receiver (SPM4651T) delivers advanced 20-channel SRXL2 protocol communication, dual diversity antennas for superior signal reliability, and a wide voltage input range (3.3v-8.4v). Lightweight and compact, it’s designed for professional Heli, Multi-Rotor, and FPV enthusiasts seeking extended range, low interference, and seamless telemetry integration—all with a hassle-free bind button for quick setup.

Specifications

ASIN	B081H8PSKP
Additional Features	SRXL2 Technology
Best Sellers Rank	#116,337 in Toys ( See Top 100 in Toys ) #34 in RC Vehicle Radio Receivers
Brand	Spektrum
Built-In Media	Spektrum SRXL2 DSMX Remote Serial Telemetry Receiver, SPM4651T
Color	Black
Compatible Devices	Spektrum Transmitter
Connectivity Technology	Radio Frequency
Controller Type	Radio Frequency
Customer Reviews	4.8 4.8 out of 5 stars (162)
Item Length	1.1 Inches
Item Type Name	Remote Serial Telemetry Receiver
Item Weight	23 g
Manufacturer	Spektrum
Maximum Number of Supported Devices	8
Mfr Part Number	SPM4651T
Model Name	SPM4651T
Model Number	SPM4651T
Number of Batteries	1 Nonstandard Battery batteries required.
Number of Items	1
Number of Packs	1
UPC	605482427354
Unit Count	1 Count

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