Electronics > RF, Microwave, Ham Radio

Making sense of this obscure RF module

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igendel:

--- Quote from: MarkMLl on June 10, 2023, 09:20:24 pm ---Eyeball all units. If there's substantial variation you might have a box of manufacturer discards.

--- End quote ---

Interesting idea, but no - I checked dozens and they all look ok. Just my luck, to pick the one defective unit out of 100 for testing  :-DD

Many of the modules' pins, however, are a bit bent and have solder traces on them. They must have been pulled.

I'll keep trying to make them work, when time allows; any other suggestions towards this goal are welcome  :)

Mr Simpleton:
It looks to me to be a regenerative receiver for  OOK (on-off keying) and I bet the frequency is 433 MHz. The missing op-amp acts as a noise-riding slicer, i.e. it will detect a  signal level above the noise (very smart design). The recieiver is wideband and will lock at any signal in the vincinity of 433 MHz. You should see  5v/0 logical level out matching the input signal puls train.
It's the first time I see a module like this having thick-film components on the pcb, nice  :-+ Looking at other similar modules you should be able to figure out how to power the module and where to get data out. But you need stimuli like a key fob or remote car key using 433 MHz and OOK modulation to verify it works.

MarkMLl:

--- Quote from: Mr Simpleton on September 11, 2023, 06:03:10 pm ---But you need stimuli like a key fob or remote car key using 433 MHz and OOK modulation to verify it works.

--- End quote ---

Every home should have one...

MarkMLl

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