[CQ-Contest] Sept/Oct NCJ article on DX Prowess of Receivers
k7nj at zahav.net.il
Thu Sep 2 10:08:35 EDT 2004
Take a look at the links mentioned below!
From: cq-contest-bounces at contesting.com
[mailto:cq-contest-bounces at contesting.com]On Behalf Of Bill Tippett
Sent: Wednesday, September 01, 2004 9:46 PM
To: cq-contest at contesting.com
Subject: Re: [CQ-Contest] Sept/Oct NCJ article on DX Prowess of Receivers
>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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