[1000mp] MP vs MkV vs K2

[1000mp@mailman.qth.net]

John, N2KBE wrote:

"I'd like to see the specs on the k2 for Image Rejection, IF Rejection,
Adjacent Channel Rejection, and Selectivity..."
==========
Image Rejection:

In the ARRL review, the K2's image rejection with the preamp off is 74
dB.


IF Rejection:

In the ARRL review,  the K2's IF rejuction with the preamp off is 89 dB.


Adjacent Channel Rejection:

You gotta specify what you mean by "Adjacent Channel"!!  If you mean
"Blocking Dynamic Range", Tracy, KC1SX (the ARRL lab tester) measured the
K2's close-in BDR (5 kHz spacing) at 126 dB.  The same test on the
FT-1000MP yielded 111 dB, and on the Mark V it was 106 dB.  The K2 again
was the clear winner.  The closest any other receiver came to the K2  on
BDR is the Omni VI+ at 119 dB.


Selectivity:

The K2 uses a variable-bandwidth scheme with five xtals in series for its
1st IF filter.  The 2nd IF filter uses two xtals and is tunable, so it is
basically used as the BFO.  This arrangement has proven quite versatile. 
The steepness of the filter skirts does not appear to be quite as good as
the Yaesu or INRAD plug-in filters for the MP (at least on CW), but is
quite adequate for SSB and also for CW, especially when used in
conjunction with the K2's audio filter.

I've been having a ball working DX with my K2 since I completed building
it on May 16th.  The 10-watter has snagged 2-ways with 80 countries so
far on both CW and SSB.  I've gotten so that I prefer its receiver on
both of those modes compared to my FT-1000MP.  It's a real joy to
operate.

73, de Earl, K6SE
K2 #2622