RCA 9TC240 Alignment...The start of my education (I hope!)

[Penthode]

Originally Posted by Chris K

So I have a few questions about this. Some of them will sound like I have no idea what I am doing and in several cases, that's absolutely true! I would like to start with the operator checks on the pages you specified.

Regarding the test setup below...



The connections shown are the only connections needed for this part of the evaluation? Blanking and sweep etc between the 8600 and the 8601 on the rear of both instruments do not need to be connected correct?

What does CW mean? Center wavelength?

RF Detector? What do I use for this? In an analysis setup, it would be the device under test but shouldn't there be a standard for it in a check setup?

For the scope inputs, the sweep output goes to the horizontal (X) input and the output of the RF Detector (whatever that is!) goes to the "Y" input? My scope needs to be in X-Y mode correct?

There...I've put my ignorance out there for all to see! Sometimes, the terms you guys throw around go right over my head! More idiotic questions to come!

Yes that is correct on both counts. we want to verify the thing is working.

The blanking and sweep inhibit are to display the markers on the scope. Instead of creating a beat blip marker where you combine the marker generator with the sweep signal at the input or output, this system introduces a marker by momentarily halting the sweep at the frequency point to make it appear brighter.

For the RF detector, I used a simple diode capacitor resistor network like the one attached. The diode i used was the ubiquitous 1N4148. It essentially rectifies and filters to remove the RF carrier and rf envelope to register on the scope. Try bypassing it and providing the y input of the scope has sufficient bandwidth (eg a 100MHz scope) bypassing it you will see the rf carrier sweep.

I have attached the use of this equipment to obtain my IF response with markers which went through the RF detector of the television set as yours will and a sweep of the luma reponse of the set minus an RF detector. This will demonstrate the presence and absence of the RF detector.