Subject: Noise blanker
Date: Sat, 26 Mar 2005 18:26:06 -0500
From: Andre Kesteloot
To: --@lwca.org
John Reed wrote:
> Find an effective noise blanker, or use phasing with a noise pickup
> antenna. I have this buzz all the time, but have worked out ways to
> get rid of most of it.
>
> John Reed
>
Many moons ago, I built a noise blanker based on John Seamons's design.
see: http://www.lwca.org/library/articles/jreed/gate/gate1b.htm
The mods I introduced were:
a) added a zener diode - the original schematic obviously relied on the
input gate (4538 pin 4) somehow clippping at + Vcc
b) replaced the 40107 with a 4011
c) the only Vcc I use is + 5v
As drawn, my blanker can handle two separate interferences, and has
been working very well for the past 5 years.
73
André N4ICK
Earlier version at: http://www.lwca.org/library/articles/jreed/gate/gate1b.htm