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

Bill Tippett btippett at alum.mit.edu
Wed Sep 1 23:45:41 EDT 2004

 >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)

Also note where it falls on Sherwood's 2 kHz IMD rankings here:

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

                                 73,  Bill  W4ZV

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