I just got this machine from a friend, I was most interested in the spectrum analyser part, I had powered it up as it had not been powered up for some time, and allowed it to set, I did some testing on the unit found that there are parts that appear to be working the spectrum analyzer is working but for example the horizontal and vertical position controls on the scope seem to have not effect. I was also thinking that I could get the spectrum resolution down enough to be able to see the 4 data carriers in C4FM and also see the center carrier if it was not nulled (that is what I am interested in being able to see is a TX with an improperly nulled carrier). I hear thumps in the RX audio but do not hear any audio even though the analyzer shows I am on channel and I can see the sign on channel.