[Elecraft] K3_P3_160_CW

[Don Wilhelm]

  Ken,

Maybe I'm missing something, but I would expect the noise floor to drop 
on a receiving antenna - assuming the RX antenna is a lower noise 
antenna than the transmit antenna - you are looking at the atmospheric 
noise and not the receiver noise floor.

73,
Don W3FPR

On 4/17/2011 3:21 PM, Ken Roberson wrote:
> Wayne,
>
> While working 160M DX last winter I noticed that when I
> Switch from RX antenna (Beverage) and back to TX antenna
> That the base line (Noise floor) on the P3 was about 2 S unites
> Less than when I changes to the RX antenna.
>
> With the default antenna ( TX antenna ) PreAmp = off and ATT = ON
> Switch to RX antenna (with the preamp off) turn the preamp on and switch back to normal antenna.
> Now if you switch the preamp on and off, the base line will return to normal.
> Hard for me to explain.
>
> Thanks Ken K5DNL
>