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Re: Topband: NOISE CANCELLERS

To: "Marcelo Chrispin" <marcelo@ultracyber.com.br>, <topband@contesting.com>
Subject: Re: Topband: NOISE CANCELLERS
From: "Tom W8JI" <w8ji@w8ji.com>
Reply-to: Tom W8JI <w8ji@w8ji.com>
Date: Sat, 16 Nov 2013 18:34:45 -0500
List-post: <topband@contesting.com">mailto:topband@contesting.com>

What is the best acquisition between Timewave ANC-4 or MFJ-1025?

While all of them will work, the Timewave phase adjustment causes a huge change in level. It also has less phase range. That is bad, because you have to go back and forth between the controls more.

The phase should really only change phase, and the level or balance should really only change the signal levels. The MFJ is much better at control action than the Timewave, and it has much better IMD performance. The DXE NCC is, of course, better than the MFJ for everything. The DXE has much wider phase range and better IM performance, but you pay for the complexity.

73 Tom
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