Design for connecting transmitters to antennas often mentions the transmission line, and the standing wave ratio (SWR) for matching. But what if the transmitter is on the antenna?
Background: I've an old 151 MHz narrow band FM 10mW transmit module TX1 from Radiometrix that I'd like to deploy monitoring a solar powered pump on a stock dam.
I plan to attach the RF out and RF ground pins on the module directly to either the base of a quarter wave with groundplane, or at the feed point of a yagi, or across a "slim jim" or J-pole antenna.
An Arduino Pro Mini will be adjacent to the transmit module, and a multi core cable will head down to the other equipment.
So the transmission line will be only a few millimetres long, and measurement of SWR seems impractical.