[Elecraft] Understanding the KX3 Block Diagram

[Igor Sokolov]

Is roofing filter switched out when dual RX is enabled in KX3? What limits 
dual RX to +/- 10 kHz?
Is it ADC or something else?

73, Igor UA9CDC
----- Original Message ----- 
From: "Wayne Burdick" <n6kr at elecraft.com>
To: "Matt Maguire" <vk2acl at gmail.com>
Cc: "Elecraft Reflector" <elecraft at mailman.qth.net>
Sent: Thursday, March 08, 2012 10:20 AM
Subject: Re: [Elecraft] Understanding the KX3 Block Diagram


> Also keep in mind those roofing filters. This is a substantial
> departure from other SDRs. Wasn't easy, either :)
>
> Wayne
>
> On Mar 7, 2012, at 8:17 PM, Matt Maguire wrote:
>
>> Here is a presentation by G8VOI which talks about some of the
>> concepts used in radios like the KX3.
>> http://www.pe0fko.nl/g8voi/SDR_1.pdf
>>
>> The presentation uses a softrock radio as a concrete example, so
>> where the presentation talks about PCs and soundcards, keep in mind
>> that for the KX3 this corresponds to the A/D & D/A convertors and
>> DSP/microcontroller that are built into the KX3 itself.
>>
>> 73, Matt VK2ACL.
>>
>>
>> On 08/03/2012, at 2:19 PM, David Stratton wrote:
>>
>>> Hoping that I may not be the only Ham puzzled by the block diagram
>>> of the
>>> KX3 I am asking that someone please explain it because it is so
>>> different
>>> from the superheterodyne radio concept I have become accustomed to in
>>> current amateur radios. I understand direct conversion radios but
>>> what is
>>> all the stuff that's there besides the mixer-oscillator and audio
>>> amplifier
>>> needed by a direct conversion radio? It seems to me the KX3 block
>>> diagram
>>> looks a lot like radios put forth some time ago by Rick Campell
>>> KK7B. Pardon
>>> my saying so but the KX3 radio looks like it has a weak front end
>>> and a
>>> heavy back end that hopes to make up for the weak front end!
>>>
>>> Dave - KO4KL
>>>
>>>
>>>
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