[Collins] 75a-2 off the wall problem

[mike nussman]

Hi all,

After doing an rf alignment,I notice that while decreasing the tunning scale,sensitivity and mixer white noise goes way down.That is until the freqs are then re approached by increasing back up the scale,then seems to rapidly increase back to normal.

Otherwise, the radio is very sensitive and dial linearity is a little bit out of spec on the end but not enough to prompt me to take the PTO out and service it.

I will get back to it this weekend (hope) and need to verify that the PTO amplitude is not dropping off.

Anyone ever experienced this with a Collins PTO receiver? 

TNX in advance
Mike
W U 4 V