On 4/25/2012 10:50 AM, Edward R. Cole wrote: > Impedance match on low noise preamps is critical
NO preamp is going to notice the difference between 1.000 and 1.05. More to the point, I suggest that you MEASURE the input Z of these preamps and find out how close they actually are to their nominal value. I suspect you will find variations on the order of 25% or more. > so many hams are > moving to use of either N or sma connectors over BNC. I have not > seen a UHF on a preamp since the 1960's. Ed, Everything you have cited regarding N-connectors is simply a matter of folks having "drunk the Kool-Aid." Just because "everyone believes it" doesn't make it true, and "everyone does it" can be a matter of "monkey see, monkey do." . Two major reasons for using SMAs and BNCs is that they have a smaller footprint on a panel, which is a big deal with today's more compact equipment. Your comments re: the importance of keeping connectors tight is right on target. Recently I've been hearing that the DIN connectors for hard line are greatly superior, and if I were living in the UHF world and had professional dollars to spend I'd probably use them. 73, Jim K9YC ______________________________________________________________ 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
