[Elecraft] Question from a newbie

[Ron D'Eau Claire]

True. And in modern equipment, high-current electrical motors are starting
to appear more often as alternator/battery technology improves. In general,
the number of electrically-powered equipment is on the rise. 

One thing the KNB2 can handle nicely from a diesel engine is the
rare-but-troublesome-when-present staccato noise from some electric fuel
injectors. They can be every bit as bad as noisy spark plugs. 

As Bob observed, *some* power line noise can be removed as well. If
something is arcing over cleanly and regularly the KNB2 will kill it. It's
the "frying egg" types of noise consisting of a mass of overlapping pulses
of varying rates and durations that the KNB2 can't handle. 

Ron AC7AC

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of John R. Lonigro
Sent: Sunday, March 11, 2007 10:40 AM
To: Ken Kopp
Cc: elecraft at mailman.qth.net; Fred (FL)
Subject: Re: [Elecraft] Question from a newbie


While it is true these trucks were probably diesels and therefore there 
was no IGNITION noise, it is certainly still possible for them to have 
produced electrical noise.  If nothing else, they have alternators.  I'm 
sure we've all heard alternator noise and I suspect the alternators on 
these trucks are heavy duty, capable of producing heavy duty noise.  I'm 
not up to speed on modern diesel engine technologies, but the fuel pump 
and fuel injectors might also be electrical these days, not mechanical, 
as in days of yore (35 years ago when I was a diesel mechanic in the army).

73's,
John AA0VE

Ken Kopp wrote:
> The "4 concrete trucks" and "two large pickups" were almost certain to 
> have had diesel engines and therefore would have had minimal ... if 
> any ... electrical noise to be heard.  Even the motors operating the 
> concrete-handling mechanisms would have been hudraulic.  Not a good 
> "test" for a noise blanker/eleminator. (;-)
>
> 73! Ken Kopp - K0PP
> k0pp at arrl.net
>