The application schematic for these Tx/Rx modules shows the antenna connected to a pin with a capacitor to ground. Any idea what value/type of capacitor to use with these?
regards,
BobG
Where is the schematic?
Leon
The application schematic is on the last page of the spec “Holy Stone Ententerprise Co. MO-SAWR-A SAW Resonator Transmitter Module”.
You can find a link to this doc on the Sparkfun catalog page:
http://www.sparkfun.com/commerce/produc … ts_id=8945
It’s called “Transmitter Datasheet”:
http://www.sparkfun.com/datasheets/Wire … O-SAWR.pdf
bobg
That’s not a capacitor, it’s just a ground connection associated with the antenna. An antenna needs some sort of ground for it to radiate properly, unless it’s a dipole.
Leon
All of the information Leon provided is true, but the OP will probably find connecting a 17cm piece of wire (or 24cm for the 315 MHz version) without a special ground plane will yield acceptable results. The transmitter won't be damaged. Just be sure to orient both the receiving and transmitting antennas in the same (vertical) direction for maximum range.leon_heller:
That’s not a capacitor, it’s just a ground connection associated with the antenna. An antenna needs some sort of ground for it to radiate properly, unless it’s a dipole.
Thanks for your replies. Sure looks like a cap to me!
Since the Tx will be portable and battery operated, there is no good way to provide a ground plane for it.
Will try the wire and do some performance testing to see what kind of range I get.
bobg