Hi all, this might be a question for bar sport but as it's electronics related im putting it here,
so i want to test the range on my XRF modules http://shop.ciseco.co.uk/xrf-wireless-rf-radio-uart-rs232-serial-data-module-xbee-shape-arduino-pic-etc/ in everyday built up areas, mounting an external antenna in my garden, is there any point? if yes what coax should i use? 50 ohm?
The plan would be to use one xrf as a beacon, the other will be mobile in my car, when a valid signal is received from the beacon the 2nd xrf will log the position from gps which can then be plotted on google maps to asses the range.
so the main question is the coax length? impedance? how much loss to expect through the coax? BTW they operate on 868.3Mhz, 75/868.3 = 86mm antenna length, other than that radio is not my strong point