[R-390] R390A- no sigs-4 to 8mc

[Tisha Hayes]

Two other areas that can cause a dead band;

Look at the rotary switches under the RF deck and under the oscillator deck.
I had a very slight mechanical misalignment and severe oxidation that caused
the 2-4 MHz bands to be dead.

The two problems were not obvious on a visual inspection. I had to ohm
though the switches from the cans on the RF deck and had to have the
oscillator deck powered up and checked the output on the coaxial cable to
catch the oscillator switch problem.
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