Re: A new KX1, maybe KX2?

Posted by Geoffrey Mackenzie-Kennedy-2 on Aug 29, 2006; 2:30am
URL: http://elecraft.85.s1.nabble.com/A-new-KX1-maybe-KX2-tp393454p393457.html

Karl Larsen wrote:

>    There are new chips that run with a 100 MHz clock.

And things seem to be getting better. The Analog Devices AD9951 can I
understand be clocked at up to 400MHz, and I hear whispers about higher
clock frequencies.

>> The relatively high 4.9 MHz IF of the single conversion Elecraft rigs is
>> already excellent for image rejection.
>>
>>
> Not so. Ask any European user and they will talk about Broadcast spurs
> that occur when a 350,000 Watt station is 1 hop away on the Image
> frequency.

Very true. Not much fun here looking down the throats of these monsters on
40m, most of whom use very big high gain antennas. The spurious responses
above 7.1MHz in my K2's receiver cause a big problem during the evenings.

> The latest mixers can help to stop this problem.

I'll second that, particularly in the case of the H-mode mixer.

73,
Geoff
GM4ESD





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