[Elecraft] KRX3 Questing

[Johnny Siu]

Hello Wayne,
Since the KRX3 is so well shielded, is there any chance the KRX3 in fact performing marginally better than the main RX?
73
Johnny VR2XMC
      寄件人︰ Wayne Burdick <n6kr at elecraft.com>
 收件人︰ "dhhdeh at comcast.net" <dhhdeh at comcast.net> 
副本(CC)︰ "elecraft at mailman.qth.net" <elecraft at mailman.qth.net> 
 傳送日期︰ 2015年05月17日 (週日) 9:59 AM
 主題︰ Re: [Elecraft] KRX3 Questoin
   
Hi Dave,

Being fully shielded, the sub RX already had very low noise to begin with. This leaves the attenuator question. Yes, the main RX now has a modest advantage in that department. If we update the sub's main board in the future, we'll add the other attenuator section to it. 

I think the more significant determinant of parity between the two is the shared synthesizer upgrade. 

73,
Wayne
N6KR

----
http://www.elecraft.com

> On May 15, 2015, at 8:46 AM, dhhdeh at comcast.net wrote:
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> Wayne, 
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> One of the original K3’s claims to fame was that the main receiver and sub receiver were identical…perhaps the only dual receiver transceiver to have this feature. The original K3 data sheets states: “…..Within the top echelon of transceivers, only the K3 offers state-of-the-art, identical main and subreceivers” 
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> If the KRX3 will not have any changes to it other than the addition of a noise reduction mod for the 100-500 kHz range, then the two receivers will no longer be identical, n’est pas? 
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> I realize that in practice they may be very nearly so, but as I read the spec’s and FAQ’s on the K3S, its main receiver will have new features and improved performance ( added 5/10/15dB attenuator, lower RF and digital noise floor, better port-to-port isolation) which I interpret, based on your comment here earlier, will not be available/included in the KRX3. Am I missing something? 
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> I am not an engineer but I am a technically informed and competent user, so I would appreciate your clarification on this point as I contemplate whether to upgrade, to upgrade but retain my original KRX3 or stand pat with my K3 as is. 
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> BTW... the year I decide not to go to Dayton, you decide to do this! arrgh.... 
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> Thanks and 73 de N1LQ - Dave K3 #371