289.1 Mhz

Sub-GHz
#1

Hi, first of all I’m a newbie in RF-related topics so I’m sorry if my question is dumb or obvious. I have this garage opener which I inherited which is extremely hard to access or replace so I’m trying to replicate it’s remote control because RC is partly broken and I don’t know for how long it’ll gonna live. I’m able to observe remote’s signal in various frequencies (using HackRF One or also Spectrum Analyser Flipper Lab). The signal is most pronounced at 288.8-289.1 Mhz and it’s frequency is quite unstable and drifting up or down a lot. I’m also observing the signal at 268.8, 288.8, 308.8, 557.7, 577.7, 846.9, 868.1-864.26, 886.5, 1135.7 Mhz which should be harmonics. The problem is that when I capture the signal at these higher frequencies and try to transmit it, garage door opener doesn’t work. I was trying to emulate the signal in Flipper such that it’s harmonics would fall into 288.8 Mhz but failed to do so. I think my problem is not that unique and someone was facing this issue before any thoughts on next steps in fighting this issue?

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#2

And how does the signal look like the sticker mentions 433? not being an ahole here but just wondering what it is putting out there , could it be the battery is far gone ? Also like the sticker, the print on the crystal for the frequency , the metal round drop on the board say’s its a 433 remote. so that might explain why it is refusing to work.

#3

433.92 + Tunable
I suspect 433 is the primary but it may be one of those remotes meant to broadcast on multiple frequencies at one time. The second I’m guessing was somehow programmable.

Not that many though! :laughing: It’s probably is meant to do 2 frequencies. Both are probably the exact same code as a way to deal with interference. I agree, most are probably harmonics. I would try capturing the signal on 308.8 and 433 but make sure the remote is arms length away from the Flipper so hopefully harmonics don’t interfere. If that doesn’t work try the signals in the 800 range.
I don’t think 268.8, 288.8, 557.7, 577.7, or 1135.7 Mhz are valid frequencies. I’ve never heard of garage remotes on any of those so I think those are spurious emissions.

#4

I would purchase Remocon-compatible remote/cloner from aliexpress and try to copy or config it as new remote to gate’s controller.
Something like https://www.aliexpress.com/item/1005005053098645.html or https://www.aliexpress.com/item/1005004663311599.html