Hi "skipp025"; Thanks for the input and comment. You are actually coming in mid-thread; but I'll try to catch you up. Unfortunately, some of the information exchange has been off-list; so I appologize for the loose-ends it left in the group's message thread(s).
I do have some of the other support items you mentioned (e.g., dummy load, attenuator/pad, RF detector, oscilloscope, watt-meter, MFJ-269,...); I was only mentioning the items I was most concerned about. I am setting up my duplexer using four Phelps-Dodge cavities (all in series for Rx), and two Cell-wave cavities (in series for Tx). All of these are individual, cylindrical, PASS-REJECT cavities. At this point, I have a setup and test methodology to tune the PASS and REJECT adjustments; and have doneso for the individual Phelps-Dodge cavities (mostly as a pre-tune and confidence building exercise). I have not re-tuned them in the full duplexer system configuration as I am still trying to make up the "proper" length cables (see other related topic thread, "measuring coax for duplexer"). I'm still a little stuck in making these cables, due to the unknown length and velocity factor for the loop inside the cavities. If you have any thoughts on this topic, please add them to the associated thread. Beyond that, I have the Tx/Rx sections of the repeater operational; and am trying to figure out how to best interface my (NHRC-5) controller and (ComSpec TS32) PL decoder/encoder (see other related topic thread, "Controller connection to RPT-21"). This portion is still in progress, trying to figure things out. If you have any thoughts on this topic, please add them to the associated thread. I've figured out a lot about using the Wavetek 1080. It's a pretty amazing piece of equipment; but I still haven't gotten the manual(s) for it. QUESTION 1: Do you have the same model Wavetek (i.e., 1080)? If so, do you have the manual(s) for it? QUESTION 2: I'm curious about the "Marker" input on the front. Do you know what it is for, and how it is used? QUESTION 3: Do you know how to read the display in terms of the calibrated signal amplitude, given a specific setting of the "Output" (in dBm)? More specifically, a friend was saying something like "in order to read the actual bandwidth of the PASS and NOTCH, I needed to measure it a the 6 dB point". Does that make sense? Do you know how I would do it using the Wavetek 1080's display on an oscilloscope? I suspect that it's just a calibration/visualization thing that I am missing. I appreciate any wisdom and experience you can offer; especially relating to the Wavetek 1080. <<< vern >>>
