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ORAWA01 · 23rd Apr 2021, 5:23 pm

The Spectrum antenna has been connected to every different radios here for testing. But they all were the same = overloading, and the MW signals appearing all over, as soon as power is on the antenna.

It was connected to the ATU and Attenuator, 10dB, 20dB, 30dB and 40dB. It just got quiet, but the overloading signals are still there, not going away.

When the Spectrum antenna was powered on, I got the DMM, and read voltage on the transistors and diodes. They all seem alive with the live DC voltages present on the legs.

Good point on the poor connection from the coax braid and the pcb. I will check it. Looking at it very closely, the PCB is clean and all the parts seem physically OK. Will upload the photo. I got it in the iPad, but now seems having problems with the internet, which makes uploading problematic.

23rd Apr 2021, 5:23 pm	#13
ORAWA01 Hexode Join Date: Apr 2011 Location: Stirlingshire, UK. Posts: 407	Re: Spectrum Comms. Active Antenna problem The Spectrum antenna has been connected to every different radios here for testing. But they all were the same = overloading, and the MW signals appearing all over, as soon as power is on the antenna. It was connected to the ATU and Attenuator, 10dB, 20dB, 30dB and 40dB. It just got quiet, but the overloading signals are still there, not going away. When the Spectrum antenna was powered on, I got the DMM, and read voltage on the transistors and diodes. They all seem alive with the live DC voltages present on the legs. Good point on the poor connection from the coax braid and the pcb. I will check it. Looking at it very closely, the PCB is clean and all the parts seem physically OK. Will upload the photo. I got it in the iPad, but now seems having problems with the internet, which makes uploading problematic. __________________ ORAWA = Old Radios And Wire Antennas Last edited by ORAWA01; 23rd Apr 2021 at 5:37 pm.