How many of the QZ-90 air defense systems can be interfered with by car keys and roller shutters?

BG4IJK

手头有个泉盛K5、宝峰5R经典款、联畅UV98，发现只要按下车钥匙按钮，不管机器频率设置成多少，5R和UV98都会被干扰，K5不会

想问下各位群友：
其他泉州机器情况如何，比方说宝峰升级款和森海克斯8800，
以及，其他地方产的机器有没有这种现象

BH3XZT

BG4IJK On the other hand, could pressing the 5R button on the key fob interfere with the car's ignition system?

SilentYANG

Cheap machines are easily interfered with, and their shielding effectiveness varies depending on the frequency of interference.

BG4IJK

SilentYANG The UV98's price was over 600, but it was still interfered with.😂

Kidio

BH3XZT Verified to work

BG2EFX

You will also experience interference if you buy a D75.
Because many of those keys are actually 433 MHz now.
If the transmitter is operating within the acceptable range (433 MHz), and your device isn't malfunctioning, it should definitely be able to receive the signal.

BG4IJK

I just tested it again.

Car key: Center frequency approximately 434.411 MHz, with significant scattering.
Radio: QuanSheng K5, BaoFeng 5R, Linkong UV98, Weinone 6600, Hytera HP780 (Why only these models? Because the others haven't been tested yet)😂）

After pressing the car key button:

5R, UV98: Regardless of the frequency (U-band), the device will transmit, but when the frequency is set to a higher value, such as 465MHz, the probability of UV98 being interfered with is reduced. The other two channels will not transmit on V-band frequencies.
K5, HP780, 6600: When the noise level is 0, setting the frequency to 434.411 allows you to hear clear sound; when set to a slightly higher frequency, such as 434.7, you can receive weak stray signals; however, when the noise level is greater than or equal to 1, regardless of the frequency, you cannot hear the car key sound.

BG2EWI

I think it depends on the device's noise threshold; my Freecom 878 is often affected by interference from the display driver circuit, with frequencies around 438.5 Hz.

BG5CQF

I tried turning off my K6, but it still interfered with the mouse, and the computer kept disconnecting.

hliang_BH2WDQ

The K6 operating at 430-440 MHz interferes with the AOC display, automatically opening the settings menu.
70dr will not...

KyrieIrving

hliang_BH2WDQ HHHHHHH

BI4MIG

hliang_BH2WDQ
When my K6 is transmitting at 5W, it can only cause Philips monitors to display artifacts, but not to the point of opening the settings menu.

EXCT

The car key emits a 433 MHz signal, which raises background noise around 433 MHz and exceeds the device's noise threshold, triggering it.

BG2EFX

In fact, all machines have that; one of its operating frequencies is 433.

BI1SFC

When using a radio transmitter near electronic devices, especially power products, it's important to be aware of potential interference.

Noa

BI1SFC When I turn on a repeater in my dorm room, my LED lamp automatically turns off.

BI1SFC

Noa That's a reminder to go to sleep now.

Noa

BI1SFC Haha

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