[Elecraft] OT: Anyone use a noise canceller?

[David Cutter]

Yes, I appreciate that controls have to be adjusted for each QSY, but when 
trying to hear that weak signal amongst QRM you would be on one frequency 
and spend time to set up the controls, (eg 3B7C).  It seems intuitive to me 
that with more than one rx antenna and mixers it should be possible to null 
more than one signal.

David
G3UNA


----- Original Message ----- 
From: "Robert Tellefsen" <n6wg at comcast.net>
To: "David Cutter" <d.cutter at ntlworld.com>; "Elecraft list" 
<elecraft at mailman.qth.net>
Sent: Saturday, September 22, 2007 3:44 PM
Subject: Re: [Elecraft] OT: Anyone use a noise canceller?


> No, David, can't say I've done that.
> I don't think it would be too successful, though,
> because when you tune away from the frequency
> where you have nulled a noise source, it comes
> back.  The null will only hold over a certain
> frequency spread, sepending on the band.  Then
> you have to redo the null.  So with two nulls
> on two sources, when you move into one null you
> would be moving out of another.  The noise might
> not show any improvement overall.
> 73, Bob N6WG
>
> ----- Original Message -----
> From: "David Cutter" <d.cutter at ntlworld.com>
> To: "Elecraft list" <elecraft at mailman.qth.net>
> Sent: Saturday, September 22, 2007 7:08 AM
> Subject: Re: [Elecraft] OT: Anyone use a noise canceller?
>
>
>> Bob
>>
>> Wonder if you (or anyone) has mixed the outputs from 2 or more noise
>> cancellers, perhaps using different antennas for each.
>>
>> David
>> G3UNA
>>
>>
>> ----- Original Message -----
>> From: "Robert Tellefsen" <n6wg at comcast.net>
>> To: "Mark Hampton" <area.x1 at btinternet.com>; "Elecraft list"
>> <elecraft at mailman.qth.net>
>> Sent: Saturday, September 22, 2007 2:36 PM
>> Subject: Re: [Elecraft] OT: Anyone use a noise canceller?
>>
>>
>> > Hi Mark
>> > If you cannot locate the noise source, can you at least
>> > determine it's direction from you?  A simple untuned
>> > loop should allow you to do that.
>> > An antenna noice canceller (ANC) works best if you
>> > can get a pickup antena as close as possible to the
>> > source, relative to the communication antenna, even
>> > if it is just to the edge of your property.
>> > I have both the ANC-4 and the MFJ-1026, and they
>> > both work well on a single noise source.  They can't
>> > cope with multiple noise sources, though, or a single
>> > source spread out over an area, such a power line
>> > that is radiating along its length.
>> > Good luck and 73
>> > Bob N6WG
>> >
>> > ----- Original Message -----
>> > From: "Mark Hampton" <area.x1 at btinternet.com>
>> > To: "Elecraft list" <elecraft at mailman.qth.net>
>> > Sent: Saturday, September 22, 2007 3:39 AM
>> > Subject: [Elecraft] OT: Anyone use a noise canceller?
>> >
>> >
>> > Hi all,
>> >        I have a S-9 noise level across the bands and despite some
>> > detective
>> > work, I have been unable to locate the source.
>> >
>> > I feel that I may have to resort to using a noise canceller in order to
>> > use
>> > the bands at the home QTH.
>> >
>> > Before I purchase one, I'm wondering if any of the subscribers to this
>> > list
>> > use one and if so, how effective are they?
>> >
>> > Apologies for the off-topic post but I though I'd canvass opinions
> before
>> > I
>> > buy one.
>> >
>> > Thanks, Mark M5MDH
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