[R-390] Calibration Osc and 2nd Osc questions

[Larry H]

Tom,  The maint man says to connect your 50 ohm sig gen output to the R-390A using the impedance adapter DA-121.  The reason I bring this up is that the adapter has a 55% signal loss, so when the book says the sig gen output reading should be less than 4 uv, the actual signal level at the rx is about 1.8 uv.  Although 1.8 uv sensitivity is ok, as Bill points out, good levels of sensitivity can be achieved.  The ones I've worked on usually end up at .6 uv above and below 8 mh.
If the 1st var IF aligns ok, then the problem could be in the 17 mh osc or 1st mixer.
Regards, Larry