The photograph on the left shows the repaired 260MHz amplifier reinstalled. The long
white SMB lead is the original and is presumably that length so as to allow the two
halves of the RF-
So I now had my Spectrum Analyzer back. But what about the faulty input attenuator?
I was able to split it and verify that one of the elements is damaged. I had an idea
that I might have a solution. I found a couple of rotary step attenuators salvaged
from scrapped test equipment. One turned out to be 1dB steps, so that was a non-
However, this solution proved to be problematic. Such was the tight squeeze that
the rear connector on the attenuator actually pushed the adjacent PCB against the
bulkhead. causing intermittent short-
I now plan to build the Weinschel attenuator into an external box that can be connected up to the front of the analyzer. There is no law that says that the attenuator must be internal.