During the test, first set the frequency of the signal source input to the transceiver to -100DB or any value. The intercom has audio output, and then reduce the output strength of the signal source.
eBay
SI4732 0.5-108mhz LSB USB AM FM FM/AM Radio 1.9inch IPS Screen Mini Pocket Radio HF SW MW VHF Radio Portable Radio
Aliexpress UK
FM radio reception and AM aviation frequency band reception. The host casing is made of low copper aluminum alloy precision die-casting. FM radio reception 78-108MHz AM aviation frequency band reception 106-136MHz.
eBay
AM / FM Stereo Receiver AM FM Digital Radio 2 Band Stereo Radio Digital Tuning Radio Radio Portable ICD Screen
Aliexpress UK
1 x Baofeng UV-5R III Tri-band Walkie Talkie Black. BAOFENG UV-5R III. Radio FM feature. -2 x Antenna to operate tri band. VHF/ UHF Tri-Band Two-Way Radio Feature. -1 x Belt Clip. Item number UV-5R III.
eBay
UV-5R Handheld Walkie Talkie 136-174MHz & 400-520MHz 5W Long Range Ham Radios Handheld UHF/VHF Radio
Aliexpress UK
Frequency Range: VHF 136-174MHz. FREE EARPIECE WITH INLINE MIC & PTT IDEAL FOR SECURITY. Digital Protocol: DMR ETSI-TS102 361-1,2 & 3. Battery Life (5-5-90 Duty Cycle): 2000mAh, Analogue 10.5h, Digital 14h.
eBay
Emergency Solar Radio Survival Hand Crank Radio with LED Flashlight Radio AM FM NOAA Portable Weather Radio Small Portable Radio
Aliexpress UK
DSP chip with good performance and stable reception, using DSP chip for stronger signal, clear reception and no noise. Jack type: 3.5mm round jack. Signal to noise ratio:>55dBu. Audio cable or earphones that can be plugged into a 3.5mm plug, can be connected to earphones, and external sound can be changed to earphones for listening.
eBay
AM FM Radio Rechargeable Battery Operated Radio Emergency Radio Survival Solar Power Hand Crank Radio Outdoor Emergency Radio
Aliexpress UK
Radio with speaker, support wired headphone 3.5mm jack, headphone stereo sound. Equipped with antenna design, stronger signal. Corresponding frequency: FM 87-108MHz, SW 4.75-21.85MHz, AM 520-1710KHz. FM/AM/SW full-band radio.
eBay
3D Printed Pocket Mini Radio Bracket Handheld Radio Mount Portable Radio Case for MINI4732 V1/V2/V3 Outdoor
Aliexpress UK
The output power of the walkie talkie radio is 10W-15W, achieving long-distance transmission. FM radio reception and AM aviation frequency band reception. FM radio reception 78-108MHz AM aviation frequency band reception 106-136MHz.
eBay
ATS125 High Sensitivity Radio 2.4 Inch Touch Screen Multifunctional BT Radio 2500mAh Hand-Held Radio Receiver for Indoor Outdoor
Aliexpress UK
(1 x Portable radio. 16)Charging Way：Base Charging / USB Charging. 17)Stand-by current: 72mA (The average current is 36mA in the power-saving state). 1)Model Number: BF-1909. 13) Frequencystability:±2.5ppm.
eBay
AM FM Mini Radio AM/FM Dual Band Portable Pocket Radios With Loud Speaker HiFi Music Player Elder Radio Battery Powered 3.5mm
Aliexpress UK