[K3] [Elecraft] KXR3 3db Splitter

[Bill W4ZV]

nl7g wrote:
> 
> I am on the waiting list for a K3 and have ordered the KXR3.
> In reading the manual for both the Sub Receiver and the K3
> an alarm bell starting ringing in my ears when I read.
> Not Quoted: Basically saying
> 1. A 3db splitter is used when the KXR3 is installed.  Turn off
> the Sub Receiver and the Main RX sensitivity is restored
> to normal.
> 2. Also stating this 3db splitter (effectively a pad??) is in use
> for both antenna ports, but is not used when the RX only
> antenna port is used.
> 
> In audio terms isnt 3db half of the power??  How much
> sensitivity is compromised by installing the 2nd receiver to
> the main receiver?
> 
> I am trying to work some of you guys in the noise floor.
> Do I need to turn off the sub receiver every time I am
> trying to work a barely audible station??
> IF this is a real problem, I have time to cancel my KXR3.
> Any practical experience by those who have received
> their sub receiver would be greatly appreciated.
> 
> Thanks Mike NL7G
> 

3 dB should not be a major a problem except possibly on 10/6m, where you
might need a preamp.  The atmospheric noise floor on the lower bands is well
above the noise floor of the K3 and you'll probably not miss 3 dB.  For
example on 160m I normally operate with the 10 dB ATTenuator on.  On 10m my
"preamp" is a 22 dBi gain antenna so I doubt 3 dB is an issue for me (no
sunspots is an issue however!)

73,  Bill

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