Posts by rabbit73

Chuck: Thanks for the information and link about your System Noise Figure spreadsheet. That looks interesting and useful. Have you seen the first post in the DHC Signal Amplifiers (Amps, Preamps, Distro Amps) thread? It...

holl_ands: Thanks for the tips about what would be suitable test. Quote: But you'll need to use very weak stations to see NF degradation, and you should conduct the test for multiple channels and perhaps also perhaps multiple...

Quote: I read through your post. I think you'd be better off aiming for highest SNR when the strongest signal and highest SNR don't correspond. Yes, I agree that SNR is an important figure of merit for an antenna. What I had in mind...

Quote: Can you run those tests with your Sony connected? I would like to try an experiment like that, but I didn't do those tests to reduce urban multipath by putting an antenna in a shielded enclosure. Credit goes to Bill Naivar at...

Chuck: Quote: What were the SNR numbers for the unshielded antenna and the two shielded versions? It's only implied by the divisions on the screen. I'm having a hard time reading the numbers on Bill Naivar's TEK 2715 SA...

Quote: Originally Posted by retiredengineer .....if my TV shows a signal is present because of the AGC levels but I get no display, does that indicate that if I move my antenna to different locations, there is a good chance I will get a...

Quote: Originally Posted by Pete-N2 Any idea what multi-path looks like? It looks like this: http://www.prism.gatech.edu/~wn17/ Note that there are two pages.

Quote: Originally Posted by holl_ands High...and even moderate SWR can distort the digital ATSC waveform, as signals mimic multipath bouncing up and down the coax downlead (Preamp's not so much). EVM (Error Vector Magnitude) is a...

Chuck: Thanks for the screen shots and neat animation. Very helpful. Quote: I think you have to be very careful about drawing any conclusions about the performance of an antenna based on the waveforms seen at any one...

Ah, yes. Peter Putnam is using arxaw's favorite RS indoor antenna and a BK Precision 2625 spectrum analyzer, which shows the amplitude of the signal across the channel. The ragged traces don't prove to me that the problem is high SWR,...