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Difference in Timewave ANC-4 and MFJ-1026 Noise Canceler

Discussion in 'Ham Radio Discussions' started by N5YPJ, Apr 24, 2013.

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  1. N5YPJ

    N5YPJ QRZ Moderator QRZ Page

    I'm shopping for a noise canceler. I am leaning towards the Timewave unit given MFJ's QC issues even though it costs a few dollars more. I welcome any recommendations anyone can give me on either unit.
     
  2. WA6MHZ

    WA6MHZ Subscriber QRZ Page

    I found the MFJ totally useless, and the ANC-4 worked very well!
     
  3. N9DSJ

    N9DSJ Ham Member QRZ Page

    Have used both. The MFJ needs to be checked for the obvious...cold or non-existent solder joints and other workmanship issues such as excessive wire lengths in the RF path.

    Also look at http://www.w8ji.com/mfj-1025_1026.htm

    The noise sensing antenna I have found to be very critical; also the adjustments to the noise canceler are pretty fine on both. It is not like adjusting an amp, tuner or transceiver final; much more sensitive to small adjustments.

    Also the effectivity depends a great deal on your noise sources...if in one direction it is much easier to deal with than multiple noise sources in differing directions.

    73,

    Bill N9DSJ
     
  4. AF6LJ

    AF6LJ Premium Subscriber QRZ Page

    I have a Timewave ANC-4 even with a marginal noise antenna I get three S-Units reduction.
    This summer I expect to get more when a new noise antenna goes up.
     
  5. WA6MHZ

    WA6MHZ Subscriber QRZ Page

    I am even thinking of hooking my ANC-4 up to the FTdx5000 as it works much better than the onboard Blanker
     
  6. AF6LJ

    AF6LJ Premium Subscriber QRZ Page

    YOu cannot go wrong by doing that.
     
  7. KD0CAC

    KD0CAC Ham Member QRZ Page

    Sue , some details on the noise antenna ?
    Thanks John
     
  8. AF6LJ

    AF6LJ Premium Subscriber QRZ Page

    Orientation of your noise antenna is important, but not critical.
    If you have the space try to orientate your noise antenna toward your strongest noise source.
    Longer is better, however the ANC-4 does have a preamp for the noise antenna.
    If you live near a strong AM broadcast station there is bandstop filter for the BC band and a notch filter for stubborn cases.
    Both are selectable by internal jumpers.

    You can use the ANC-4 and the MFJ as a steerable receiving antenna.
    Put up a pair of dipoles that are crossed, like a turnstile but fed with separate transmission lines.
    One is your main antenna the other is your noise antenna, The Noise Phase control on the canceler now becomes the steering control.

    The main thing to remember with this device is to avoid running the noise antenna too close to your transmitting antenna.
    My noise antenna and main antenna come very close to each other I have tested the degree of coupling on the bands I use and in all cases running a KW I have less than 50mw into the noise antenna. This works out for me because the noise antenna is not in the same plane as the main antenna.

    One thing I should mention the noise antenna can be just a peace of wire, however I have found that using an antenna fed with coax works best as the end fed wire from out of the back of the ANC-4 will pick up noise generated in the room which may reduce its effectiveness.
     
  9. KD0CAC

    KD0CAC Ham Member QRZ Page

    I spouse if I ever get set up with an antenna farm / lotto , then I may not need noise canceling .
    In a RV lot now so I have been looking at one of these and external antenna /s to help .
    Also have seen Tom's W8IJ mods page .
     
  10. N5YPJ

    N5YPJ QRZ Moderator QRZ Page

    Have you ever used your ANC-4 while running high power like your amp?
    I know that the unit goes before the amp in line but I'm worried about overloading the RX antenna with my 1 KW amp.
     
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