[600MRG] RX antenna tests

[Larry]

Last nights testing produced some surprises and some compromised data. I 
am still trying to refine my test setup and data collection system so I 
will probably re-run these early test if/when I get the chance.

The test last night (2/12/15) compared my 600' BOG to a W1VD style 
eprobe/active antenna. Like the previous PA0RDT unit, the circuit was 
slightly modified to allow separate power and RF output. (Normally these 
thing are powered through the coax) Separate connections allow for 
additional common mode / ground loop isolation for these tests.

At the start of the test when signals were low, the probe performed as 
expected with S/N differences in the same range as the PA0RDT probe. As 
the evening wore on, band conditions got VERY good and signal levels 
increased to the point where receiver AGC action was compressing the 
difference in S/N data. As a result the overall average S/N difference 
between the probe under test and the BOG was smaller than it should have 
been. Still the trend is valid and obvious.

When the previous test was run, the backup station computer had problems 
which limited the amount of data collected. Having fixed that issue, 
last nights run produced so much data that I could not handle it. Greg, 
W7MY, stepped up and did the data reduction and report generation for 
me. The resulting data is shown on my web page:

http://w7iuv.com/630/RXtest2.pdf

AS time and opportunity present, I will be running similar tests on 
other RX antenna systems.

73, Larry W7IUV / WH2XGP