Losing Signal at 75 meter in RC airplane.

[Carlos_RC]

Hello, Please help us with the following problem we encountered during our first assembly of an electric PNP RC airplane. The plane we bought:
FMS PA-18 1300mm w/Reflex PNP
We have the following radio:
RadioMaster TX16s (4 in 1)
We were advised to buy a receiver from the same brand:
RadioMaster - R88 V2 8 channels Frsky D8 / D16 and Futaba SFHSS Compatible with PWM / Sbus receiver
Channels: 8
Frequency range: 2400-2483.5 MHz
Power input range: 4.5-6 V
Signal format: Compatible with D8, D16, and SFHSS
Output format: PWM/Sbus
Range: over 1 km
Antenna length: 15 cm

We have flown it twice. On both occasions, when flying over 75 meters, it loses signal and falls to the ground following a kind of vortex (Failsafe Mode: Receiver). We're new to the hobby. But we've using this radio for helicopterat over 300 meters.
What do we need to configure? It's a fairly short distance for it to lose signal, considering the receiver specification says it has a range of 1 km.

We appreciate your help. Regards.

 

[HENNY]

Have you selected compatable formats in the TX to match the receiver format. How have you placed the receiver antennas. The should be outside the fuselage one either side away from any metal objects and away from any other electronics. Best to perform a range check before proceeding any further.

 

[Carlos_RC]

Have you selected compatable formats in the TX to match the receiver format. How have you placed the receiver antennas. The should be outside the fuselage one either side away from any metal objects and away from any other electronics. Best to perform a range check before proceeding any further.

Hello HENNY , thanks for your reply. I'm attaching images of the binding and telemetry screens in case they help us solve our problem. We didn't pay much attention to the antennas, following a tutorial we followed, but we'll follow your advice. Thanks.