It IS periodic, not random. Each noise pulse has a definite
signature. It is well above average random noise. A noise blanker of any
sort desensitizes the signal channel during the noise pulse. In fact,
the pulse can be singular. It is important that the timing is correct,
that is, if the blanker or the channel it blanks, has too much time
delay the pulse and hole do not coincide. Mostly they do and digital
circuits can provide delay where necessary to synchronize them.
Perhaps I should not have said periodic but there is a better term
for non-random which I am not thinking of at the moment (blanking on it).
The kind of noise that you can't cancel is random noise generated
in two different places, such as in the receiver vs: from space via an
antenna. They don't cancel, they combine.
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On 6/9/2024 6:26 PM, Mike Feher wrote:
Rich ¨C Ignition noise is far from periodic. It may approach that at a
constant speed, and may be somewhat predictable in the same vehicle
where the receiver is. An SX117 for example and most others are used at
home and are subject to numerous noise sources, the combination of which
is anything but periodic. 73 ¨C Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell NJ 07731
908-902-3831
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
