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I have an ESA-L1500A with the tracking generator installed. I am trying to tune an oddball hybrid ring type of Sinclair R101 lowband duplexer to 6 meters. I can only see down to about -80db. Is there a way to increase dynamic range? How would I see down to the theoretical -100 db notch?

I have never used your specific instrument, or on that duplexer type that you mention. But in my expedience of tuning conventional duplexers with a tracking generator, once the notch can no longer be visualized clearly because it drops into the noise floor of the analyzer, I just increase the signal level into the duplexer which brings the curve further up into the visible area with once again a well defined notch peak. Works for me every time.

Are you using the narrowest available RBW it's capable of?

Ed

Yes, 1k.

Casey,
Several ideas:? Set the attenuator to 0dB manually.? Turn on the internal preamp if equipped, or add a preamp externally.? Set the attenuator to 0dB manually.? Add a modest power capability (say +20dBm max output) amplifier to the TG output.? Be cognizant of not exceeding the somewhat nebulous maximum input power.? (specified at +30dBm with +15dB or more attenuation.? I can't find a spec for max input power with 0dB attenuation.? Use narrow bandwidth.
--John Gord