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Technical Support / Radio noise , interference Rosetta for COM
« on: May 28, 2020, 09:56:27 am »
After first fly test of Rosetta powered from Power Bank :
1. very strong audible noise in headphones from COM radio
2. noise was stronger or weaker if Rosetta was moved around plane
After investigation:
1. the source is Rosetta electronic board , of course
2. the receivers are shorts ends of shielded microphone cables, soldered to GA sockets (in my case)
it is high impedance , low voltage input so after amplification in transceiver or intercom, the voltage exceeds
settings of SQELCH and apperas in headphones, very often prevents proper communication.
Recomendation
1. install Rosetta as far as possible from Headphone sets sockets , from Intercom and from transceiver as well.
In my case in some positions, noise occurs even 40 cm from microphone sockets.
Installing Rosetta remember to give possibility to receive and transmit signals , GPS , 1090 MHz, WiFi ..... close to window (with insides antenas). In some places of my plane there was very good place for GPS, 1090 .... but WiFi to Sky Demon was very weak so .... especially in metal plane it can be investigation process to find a proper place.
Good luck.
Grzegorz
1. very strong audible noise in headphones from COM radio
2. noise was stronger or weaker if Rosetta was moved around plane
After investigation:
1. the source is Rosetta electronic board , of course
2. the receivers are shorts ends of shielded microphone cables, soldered to GA sockets (in my case)
it is high impedance , low voltage input so after amplification in transceiver or intercom, the voltage exceeds
settings of SQELCH and apperas in headphones, very often prevents proper communication.
Recomendation
1. install Rosetta as far as possible from Headphone sets sockets , from Intercom and from transceiver as well.
In my case in some positions, noise occurs even 40 cm from microphone sockets.
Installing Rosetta remember to give possibility to receive and transmit signals , GPS , 1090 MHz, WiFi ..... close to window (with insides antenas). In some places of my plane there was very good place for GPS, 1090 .... but WiFi to Sky Demon was very weak so .... especially in metal plane it can be investigation process to find a proper place.
Good luck.
Grzegorz