[Elecraft] K3: SO2R-in-a-box

[Joe Subich, W4TV]

"SO2R-in-a-box" will probably require that the subreceiver 
use the 2nd antenna jack on the KAT3 (or a yet to be designed 
antenna switch) in order to be compatible with conventional 
BPF, antenna switching and amplifier configurations.  In that 
case it will be limited by the isolation in the KAT3. 

The alternative is to use the subreceiver and Aux Ant jack 
with A<>B logic for transmitting.  That case will require an 
entirely new band decoding/BPF/antenna switching topology - 
one that supports TX/RX/RX switching (which happens to be on 
of the features of microHAM Station Master Deluxe whenever 
it is finally available) and an understanding that the 
transmit "radio" will always be in the left ear (e.g. will 
move with transmit focus). 

73, 

   ... Joe, W4TV 
  

 


> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Bill W4ZV
> Sent: Friday, October 16, 2009 10:46 AM
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K3: SO2R-in-a-box
> 
> 
> 
> 
> 
> wayne burdick wrote:
> > 
> > It may be possible to do full duplex with the sub receiver on a
> > different band and antenna from main, since it's very 
> well-shielded.  
> > I'll give this a try. Some firmware changes will be required.
> > 
> 
> Remember that most folks who want to do this will be running 
> full power, so you'll need a set of external bandpass filters 
> besides internal shielding. 
> I would let a SO2R op close to you (like W0YK or K6XX) 
> thoroughly test it at full power before releasing it.
> 
> 73,  Bill
>