[600MRG] QEX Noise Canceller

[William E. Isakson]

you wrote:
'He made the point that for any noise canceller, the only really effective
"noise antenna" is an exact duplicate of your normal receiving antenna'

That is not entirely true.  You can use a different antenna as the
secondary antenna and amplify its signal so that it is equivalent to your
main antenna.  The MFJ noise canceller, for example, offers 2 input levels
for the secondary, one a 10X amplification, and then an attenuator to
equalize the signals.  I can testify that this works.   You are not really
interested in the very low level noise this method might miss anyway.   You
are after major noise sources.

--------


Bill Isakson     AC6QV
Roseburg, Oregon USA
bill.isakson at gmail.com




>>  On Mar 30, 2015, at 12:32 PM, Kenneth G. Gordon <
>>> kgordon2006 at frontier.com> wrote:
>>>
>>>  On 30 Mar 2015 at 8:56, Frank Lotito wrote:
>>>>
>>>> Has anyone tried the noise canceller circuit presented in the Jan / Feb
>>>> 2012
>>>> issue of QEX? Specifically, for the 600 / 630 meter bands?  The article
>>>> by Fred
>>>> Brown, W6HPH, is titled "End Man-Made Noise with the Noise Canceller,"
>>>> pages 12
>>>> through 14.  The author alludes to tailoring the design for the
>>>> frequency band
>>>> of interest.  The QEX article presents a 75 meter design.
>>>>
>>>> 73 Frank K3DZ / WH2XHA
>>>>
>>>
>>> Frank (and others):
>>>
>>> There was a truly excellent article in Electric Radio Magazine for
>>> February
>>> 2014 on noise cancellers by Mike Murphy WU2D.
>>>
>>> The final unit he described both reduced his own noise level by +25 dB
>>> and
>>> is adaptable, easily, to any band or frequency.
>>>
>>> He made the point that for any noise canceller, the only really effective
>>> "noise antenna" is an exact duplicate of your normal receiving antenna.
>>>
>>> Mike is quite a character and is very talented. I sometimes wish he was a
>>> member of this forum.
>>>
>>> Ken W7EKB
>>>
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