2676
« on: 2011-01-21, 07:55:54 »
Hi
The RRC.s generate extremly low noise levels, Ethernet by it's nature generate som noise, 100 Mbit more then 10 Mbit so a Jan says always use Preferred 10 Mbit. Even if the RRC fullfills CE and FCC demands a cheap chineese router or switch may not do it, so noise can come backwards from the switch etc.
One guy sent be his RRC and say there nust be something wrong with it, as soon as he connect it he gets S9 + 30 dB noise on 80m. I checked it with a spectrum analyzer and even put an antenna wire to a HF rig direct on the pcb and no s meter indication. Anyway I replace the pcb and before sending it to him I did the same measurements and took a photo of the setup and S-meter which I attached. When he got it the had the same problem, but at that moment he understood that the problem was local and he found out that it was his switched power supply which he connected to the RRC which started to generate the noise as soon as there was a load connected to it.
73 de mike