[Elecraft] Band pass filters, was ICE

[Rick Stealey]

>
>  * Whose radio am I protecting, mine or the other guy's?
> Your radio

Actually one of the main reasons the filters are used is in DXpedition 
or FD setups to restrict the phase noise you transmit to your (phone or 
cw) part of the band so there can be other stations operating on the 
same band.  So you are protecting the other stations ability to 
use the band at the same time.  So if he has a lousy phase noise
rig at least he won't be complaining that the K3 is making 
whishing noises as you transmit your cw.  Of course his receiver
will probably be desensing, but that's another matter.  See below


>
> * Where does the K3 stack up in the world of transmitted phase noise
> in amateur radio equipment? 

The lowest level of all radios.  ARRL publishes transmitted phase noise
as part of the review report.  At 10 KHz away the K3 is the best but has some 
competition.  At 100 KHz away it is 15 db better than the closest competition.
But it is just as important on the receiving side where it makes the "reciprocal
mixing" spec just as outstanding.  See above.

Rick  K2XT