I have noticed over the years of having a Collins R-390 receiver (not the A model) made in the 1950's how wonderful the quality of audio is coming from the speaker. Also, the accuracy of the dial (after a quick cal) and the rock-solid stability of this vintage receiver make it a real pleasure to use. However, the sensitivity is a bit low and weak signals can be a challenge to copy. By coincidence, I had a RF amplifier made by Ameco (MFJ makes one also, model MFJ-1045C) that I connected to the antenna input of the receiver and improved the signal sensitivity by 20 dB (voltage gain). The purpose of this video is to help others with the R-390(A) or any other receiver boost the sensitivity of input signal while increasing noise floor as little as necessary. This simple improvement worked really well for me and it might help you also. 73 WA4QGA
12 сен 2024
