Here are some specs:
But back to Tom's point. I went through a
number of swept test data and
was
surprised to find that my generalization was not
true in all cases. Here
is
the 5-kHz data for the rigs I checked:
(In alphabetical order...)
Rig BDR IMD DR
Elecraft K2 126 88
ICOM IC-706 MkII G 86 74
ICOM IC-756 98 67
ICOM IC-756 Pro 104 80
ICOM IC-775DSP 104 77
Kenwood TS-570D 87 72
Ten-Tec Omni 6+ 119 86
Yaesu FT-1000MP 111 83
Yaesu FT-1000MP Mark V 106 78
In the vast majority of cases, the numbers are
less than at the 20 kHz
spacing, but the amount of variation between
similarly priced radios was
unexpected.
Note that some of the above rigs would
experience a _blocking_ response
from
an S9+30 signal that was more than 5 kHz away.
end of repost......
OK, if you look at the above, you will see most
rigs aren't so good at close spacing. THe
Kenwood 570 blocks about the same as a IC-706.
My modified Drake R4C's block at anywhere from
zero to plus ten dBm at 1 kHZ spacing!
73, Tom W8JI
w8ji@contesting.com
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