Hello,
The module seems interesting.
I just wonder what is the possibility to apply FM modulation.
Any schematic of this module available?
The WRL-08946 is a OOP/ASK/CW transmitter. It doesn’t do FM or FSK.
This is obvious, the question is if the re is parallel/serial capacitance added (transistor) next to the quarz, then the frequency should swing - FM modulation.riden:
The WRL-08946 is a OOP/ASK/CW transmitter. It doesn’t do FM or FSK.
example:
atmel T5750: Modulation Scheme ASK/FSK
– FSK Modulation is Achieved by Connecting an Additional Capacitor Between theXTAL Load Capacitor and the Open Drain Output of the Modulating Microcontroller
Someone tried already this?
Sorry about giving you an “obvious” answer to your question. It was difficult to gauge the amount of information you had based on your original post.
One could place a varactor across the resonator and get some type of FM. There is no way of telling how successful you will be, how frequency stable it will be, or what frequency deviation you will get. You will have to experiment.
Google did turn up a document that shows a similar design which may be helpful for you:
hello Ralph,
Thank you for the schematic. Seems a bit different compared to the WRL-08946.
May be some good person will provide the actual schematic of this transmitter or similar.
Edit: there is a link to parts list , schematic and board of simple transmitter and receiver 433Mhz