Topband: Hi Z amplifiers for 160m

[Jim Brown]

On 3/12/2020 7:44 PM, Dave Cuthbert wrote:
> Feel free to review my method/math and make corrections as needed.

Didn't review your math, but the more important question is, "how old is 
your noise data?"  In my experience trying to work EU on Topband now as 
compared to c.a. 2007-8 is vastly more difficult thanks to higher noise 
levels on both ends. Back then I could work EU on CW; now, with better 
antennas, I need the 10 dB advantage of FT8. In the past six seasons 
I've heard six EU/U.K. stations on CW, two were able to hear me. And 
those were all during one of this season's contest.

Bottom line -- if your noise data is ten years old, I'd add 10 dB to it; 
if it's older, probably more.

73, Jim K9YC