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Re: [CQ-Contest] New Radios

To: <cq-contest@contesting.com>
Subject: Re: [CQ-Contest] New Radios
From: "Marijan Miletic', S56A" <s56a@bit.si>
Date: Fri, 6 Jul 2007 21:45:55 +0200
List-post: <mailto:cq-contest@contesting.com>
CT1BOH wrote: the ability to dig weak signals in the presence of very strong 
nearby signals.

I read recently a simpler definition of RX:  The ability to receive desired 
signal and reject ALL others!

With present day semiconductors sensitivity is easy, DSP and quarz crystal 
technology helps with filtering.
Superheterodyne in still prelevant HF architecture and first IF should be 
preferably three times above highest 
input frequency in order to reduce intermodulation problems.  However, 
marketing gurus found a niche for 
oldfashioned CW operators willing to spend thousands of dollars on gadgets with 
better IMD3 at 2 kHz.  
I wrote once that I experienced busy hamradio bands only in Silicon Valley at 
WRTC-1996.  I am sure 
there are no strong nearby signals at CT3 with the exception of TV ones!

I guess QEX reading of G3RZP and SM5BSZ articles is difficult so we discuss the 
size of main knobs instead.

73 de Mario, S56A, N1YU

Disclaimer:  Using FT-1000MP after IC-735, worked on almost all other radios.

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