Just a quick question: > On 4/25/12 7:09 PM, Alan Bloom wrote: > Since two N or UHF adapters were used, I assume the loss per connector > is half the total. The vertical scale was .1 dB/division, so I estimated > the insertion loss to the nearest .01 dB or so: > > --------- Type N -------- ---------- UHF ---------- > FREQ (MHz) TOTAL LOSS PER CONNECTOR TOTAL LOSS PER CONNECTOR > 1.8 0 dB 0 dB 0 dB 0 dB > 30 0 0 0 0
What are the measurements below this? I'm not sure I can work any DX at those frequencies. I always tell my microwave experimenter buddies that if I can walk there and talk to the guy, I'll do that and not worry about my radio. :) > 100 0 0 0 0 > 150 0 0 0.02 0.01 > 200 0 0 0.03 0.015 > 450 0 0 0.18 0.09 > 600 0 0 0.26 0.13 > 900 0 0 0.66 0.33 > 1000 0.05 0.025 0.8 0.4 > 1300 0.1 0.05 0.86 0.43 > 1600 0.05 0.025 0.5 0.25 > 2000 0.05 0.025 0.02 0.01 Oh, and for technical content: even though you get an impedance mismatch, at the frequencies I care about the mismatch is so short that you don't make it far around the Smith chart (easier than doing the calculations). It doesn't really matter that a UHF connector isn't exactly 50 ohms when it's << a wavelength, 1/10 the wavelength. So if a UHF connector is about an inch, 10 times that is about 10 inches, or about what I think is a nanosecond is (about a foot) which is 10^9Hz or about a gigahertz. So back-of-the-envelope, UHF connectors impedance mismatch only matters around a gigahertz. This would horrify my engineering profs because MIT back-of-the-envelope calculations would require Maxwell's equations. -- Hisashi T Fujinaka - [email protected] BSEE(6/86) + BSChem(3/95) + BAEnglish(8/95) + MSCS(8/03) + $2.50 = latte ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
