[Elecraft] New KAT500 pics from the Visalia DX convention

[Jim Brown]

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