[CQ-Contest] Sept/Oct NCJ article on DX Prowess of Receivers

[Bill Tippett]

AA4LR:
 >The primary reason the K2 and K2/100 rigs do so well on these receiver 
tests is because they use a very simple single-conversion design. Although 
the first (and only) IF filter isn't a particularly sharp-skirted design, 
it is sufficient to knock out most all adjacent channel interference.

         Sufficient only for 5 kHz spacings and above.  The K2
falls apart very badly at closer spacings.  IMD performance
is mediocre at best for 1-2 kHz spacings.

IMD: 91 dB @ 5 kHz.....67 dB @ 1 kHz   (graph on page 19)
BDR: 135 dB @ 5 kHz.....116 dB @ 1 kHz   (graph on page 20)
http://www.arrl.org/members-only/prodrev/pdf/lab/k2.pdf

Also note where it falls on Sherwood's 2 kHz IMD rankings here:
http://www.sherweng.com/Dayton_2004/Dynamic_Range_Data.pdf

As I said previously, how many contests have you heard
recently with signals spaced 5 kHz or more?

                                 73,  Bill  W4ZV