I am using two 443 MHz transceivers (FY-605 transceiver) with both having different antenna lengths. One antenna is around 12cm long and the other antenna is around 17cm long. Will this cause problems? And does it affect the range or doesn't it work at all? Also the ±12cm antenna is connected to the transceiver with a coax cable. As far as I know this doesn't cause harm. Can anyone confirm this for me?
Two different length antennas can cause problems
433mhzantennacoaxtransceiver
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Best Answer
As Andvaka said, there are many things that could be affecting range. For this to be properly answered, more information should be given. Without this information, I am assuming you are using two quarter-wave monopole antennas. Any change in length from the ideal quarter-wavelength length will, most likely, degrade the performance of the antenna. In order to properly design these antennas, a network analyzer would be needed to tune the antenna for the given environment (most things within the near-field range of the antenna will affect its resonance frequency). Without this equipment, I would design their lengths to be a quarter-wavelength in length. Also, since this type of antenna works with a single-ended signal, you need to ensure that you are actually feeding the antenna with a single-ended signal and not a differential signal. In addition to all this, make sure that the antenna are oriented so that there is no cross-polarization mismatch. This essentially means that both antennas should be oriented in the same fashion, i.e., both vertical. I hope this helps...