Just acquired a "Precision" E410C sweep gen with marker gen

[wa2ise]

Picked this up yeaterday at the BARA ham club auction, and trying to figure out how to use it. Yes, I have the instruction manual, but some things are not clear, or I didn't see them .

First, the frequencies as marked on the dial are way off (so much for "precision" ), and took the covers off the generator, but found nothing I could adjust. So I just remarked the dial as to what frequencies it does generate (using my Icom HF ham transciever to find the frequencies it does generate. I set the Icom to say 20MHz, and see where to position the dial to have it produce 20MHz, and mark it accordingly. Okay..) And the marker generator crystal oscillator works. But what I'm having trouble using is the section where I inject the "receiver response" (you tap some point of the IF you're aligning to feed back into this machine) and mix it with the marker. And there's a "scope vertical" that you use to feed to the vertical input of your scope (I have a modern reall scope, a Tektronix 400MHz job, with 50 ohm input impedance, which may be an issue.)

Thing is, I don't see anything on this "scope vertical" output. Looking at the machine's schematic in the manual, I can see that the scope's 50 ohm impedance would not play nice with the megohm range mixing circuits in the machine. So that's one issue to resolve. Maybe build a cathode follower stage to convert the high impedance to an output that won't mind the 50 ohm load.

Question: Should the connection cable that I use to feed the "receiver response" have a detection circuit, like an AM detector in an radio? This would be for use in a circuit that hasn't been detected in the radio yet.

One thing I want to do is look at the response of say a ceramic IF filter. Maybe I need the diode detection in my "receive response" cable?