[Elecraft] Does AGC level change effectiveness of KNB2?

[Sverre Holm - LA3ZA]

The AGC setting of the K2 does not affect the KNB2 action. 

The AGC voltage is derived at the output of the IF chain and feeds back
to the MC1350 IF amplifier. The noise blanker is before the MC1350, so
AGC action should not change the performance or effectiveness of the
KNB2.

A simple test of the noise blanker is to scratch Q22, the post-mixer
amplfier, with a screw driver. This noise is the right kind of noise for
the noise blanker.

73, 
Sverre

------------------
Sverre Holm, LA3ZA
www.qsl.net/la3za



> -----Original Message-----
> 
> I wonder if the effectiveness of KNB2 is determined by the 
> AGC level.  Mine is set low so that AGC on or off shows 
> little difference in background noise.  I have R1 set at 3.458V.
> 
> Does the AGC level change the effectiveness of the noise blanker?
> 
> 73 de NA8M
> John