I often study the screen of my P3, which DOES show reduction of noise
when the wider NB is active. 2-4 dB is typical for the types of noise
for which it is effective.
2 - 4 dB may be due to upsetting the impedance at the IF feed but given
the circuit topology it is not possible for the NB to provide effective
blanking to the P3 with the noise gate *after* the IF pick-off point.
73,
... Joe, W4TV
On 2014-08-15 5:13 PM, Jim Brown wrote:
On 8/15/2014 11:29 AM, Joe Subich, W4TV wrote:
Jim, that information is incorrect. The K3 NB can not possibly have
any impact on the P3 or P3SVGA as the IF pick-off is at the output
of the first mixer - *before* any noise blanker gate.
Joe,
I've never studied the schematic or signal flow in the regard, but I
often study the screen of my P3, which DOES show reduction of noise when
the wider NB is active. 2-4 dB is typical for the types of noise for
which it is effective.
I appreciate the alert to the existence of the P3 NB. I last updated
firmware about six months ago, and it was not in that version. It does,
indeed, work pretty well.
73, Jim K9YC
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