henrimic Posted September 4, 2022 Report Share Posted September 4, 2022 I have recently upgraded my A10-RX to a new A20-RX. The idea is to move from the crowded UHF band to the 1.3 GHz band and to reduce the lenght of the antenna on the A20-mini transmitters. As I was searching technical informations about the effects of obstacles, and especially human body, on the transmission at higher frequencies, I found this very interesting study: https://www.bakom.admin.ch/bakom/en/homepage/frequencies-and-antennas/facts-and-figures/the-effect-of-the-human-body-on-wireless-microphone-transmission.html If I understand well, if the body is an absorber in the UHF band, it acts more like a reflector at higher frequencies. I will try to work in the 1350 MHz range next week and I'll let you know if I see an improvement in the transmission at these frequencies. Quote Link to comment Share on other sites More sharing options...
Rick Reineke Posted September 4, 2022 Report Share Posted September 4, 2022 I do not think a few thousand Hz will make any difference. I just try to avoid having an antenna touch bare skin which can attenuate an RF signal significantly. Quote Link to comment Share on other sites More sharing options...
Patrick Farrell Posted September 4, 2022 Report Share Posted September 4, 2022 Their point of reference for radiated power increasing is 3 GHz. The effect will be much less pronounced at 1350 MHz. Also note they say shadowing increases with the frequency. So if you hide the pack on talent's back, you'll get a stronger signal with their back to you but relatively less when they face you which means greater fluctuations and a less stable signal. Quote Link to comment Share on other sites More sharing options...
henrimic Posted September 7, 2022 Author Report Share Posted September 7, 2022 Back from my first shoot with the A20 mini and A20-RX in the 1350 MHz band. So far, I haven't noticed any difference in range compared to UHF. I put the transmitter in the front pocket of the talent and had no problems, even when he was walking quite a distance away, from behind. His body seems not being a more noticable obstacle, which is good news. The real advantage is that the antenna is now really tiny, about 2 inches, and that makes a real difference to hiding the transmitter. Not to mention that the band was totally clear when I scanned it. Quote Link to comment Share on other sites More sharing options...
Soundwil Posted September 8, 2022 Report Share Posted September 8, 2022 Thanks for reporting your findings Henrimic, very interesting. Quote Link to comment Share on other sites More sharing options...
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