[Elecraft] K3 vs. Icom IC-7600

[Eric Swartz - WA6HHQ, Elecraft]

Hi Wes,

The difference is that we can go to as low as 200 Hz for our first IF 
filter ahead of the 2nd mixer, limiting what it sees for strong off 
frequency signals. The 7600 can only get down to 3 kHz (measured by 
Sherwood closer to 5 kHz) before its 2nd mixer, which is as wide as a 
barn door with respect to interfering signals. The closer to the front 
end of a radio you can get your narrowest filter, the better your 
overall strong signal dynamic range.

73, Eric  WA6HHQ
Elecraft



Wes Stewart wrote:
> First let me say that I once owned and Icom IC-211.  It was such a POS  (using solder bridges between IC pins instead of circuit traces for example) that I gave it to a friend who also had one.  I often said that it was a measure of his character that he accepted the "gift" and we still remained friends.  So I am no friend of, or apologist for Icom.
>
> That said, why would the second mixer in the Icom be any more susceptible to overload than the second mixer in the K3? (Disregard the other evidence that the Icom 3 KHz filter isn't really 3 KHz.)
>
> Wes  N7WS
>
> --- On Tue, 6/16/09, Eric Swartz - WA6HHQ, Elecraft <eric at elecraft.com> wrote:
>
> From: Eric Swartz - WA6HHQ, Elecraft <eric at elecraft.com>
> Subject: Re: [Elecraft] K3 vs. Icom IC-7600
> To: "HowardZ" <HowardZ at howardz.com>
> Cc: elecraft at mailman.qth.net
> Date: Tuesday, June 16, 2009, 10:27 AM
>
> Unlikely since thy use a high first IF with their narrowest roofing 
> filter at 3 kHz. signals inside that filter will overload the first 
> mixer and subsequent stages, well before any later crystal or DSP 
> filtering can do any good.
>
> 73, Eric   WA6HHQ
>
>
> HowardZ wrote:
>   
>> Universal radio lists the radio as having
>> "104dB dynamic range and +30dbm 3rd order intercept point ".
>>
>> Maybe it will soon make the top of Sherwood's list.
>>
>> However, I do not see any mention of "diversity receive".
>>    
>>     
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