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 Noise/Null canceller recommendation? Timewave ANC-4 or MFJ-1026?
charliez  [Team Member]
1/23/2010 4:50:34 PM EST
I'm considering these 2 noise cancelers as I operate from a development with a lot of household noise.

Timewave ANC-4 http://www.eham.net/reviews/detail/1138

MFJ-1026 http://www.eham.net/reviews/detail/1205

The MFJ unit appears to have more controls, and for shits and giggles allows the phase array use of 2 antennas (rotating the antenna direction electrically vs. physically). But doesn't win any points for me as I really don't have use of phase array capabilty (need at least an antenna farm ).

Has anybody had any experience with either?

Thanks!
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charliez  [Team Member]
1/24/2010 11:46:46 PM EST
Bueller? Bueller? Anybody?
HarryStone  [Team Member]
1/25/2010 6:31:20 AM EST
I'm planning on buying the ANC-4 soon. I'll let you know what I think of it.
charliez  [Team Member]
1/25/2010 9:49:42 AM EST
Would you share the decision points for ANC-4? It's OK even if it's flip a coin
HarryStone  [Team Member]
1/25/2010 5:47:04 PM EST
You can transmit through the Timewave but not the MFJ. Also the MFJ is made by MFJ.
A_Free_Man  [Team Member]
1/25/2010 5:54:10 PM EST
I use the West Mountain Radio CLR-SPKR. It has a built in audio amp and 4-level DSP. It requires 12 volts at perhaps a few hundred ma's at most. It also has a 1/8" headphone jack so that you can take advantage of the DSP with headphones.

It works for me.

charliez  [Team Member]
1/26/2010 5:02:23 PM EST
Thanks Harry! I've read the reviews of the MFJ one and build quality is questionable.

Freeman, I have a buddy with a DSP box and should try that out sometime.

The noise canceler does it at the antenna input vs. the audio stage, so in theory should be more effective at cancelling local RF noise.

On the other hand the DSP box given it works ataudio stage, could in theory work for both local and DX noise.
charliez  [Team Member]
1/28/2010 5:58:31 PM EST
My ANC-4 arrived today. Set it up using the provided wire noise antenna and the noise went away to S0!

All that's left is atmospheric noise and occasional spikes from light switches being flipped.

I might extend the noise antenna outside to null noise from the neighbors and light poles as well.
I'm glad I got it.

Posted Via AR15.Com Mobile
HarryStone  [Team Member]
1/28/2010 8:03:24 PM EST
Thanks for letting me know how it worked out. I hope to buy one soon. I have bad power line noise here that's gone away almost completely since it's gotten cold. But I imagine I'll need it again come spring. A few hundred yards from my house it's so bad that it completely covers the AM broadcast band even now.

If you don't mind report back when you move your noise antenna. I'm hoping to be able to get by with using an indoor antenna too.
A_Free_Man  [Team Member]
1/29/2010 11:04:20 AM EST
Originally Posted By charliez:
My ANC-4 arrived today. Set it up using the provided wire noise antenna and the noise went away to S0!

All that's left is atmospheric noise and occasional spikes from light switches being flipped.

I might extend the noise antenna outside to null noise from the neighbors and light poles as well.
I'm glad I got it.

Posted Via AR15.Com Mobile


Yes, thanks for the report!

Paul
charliez  [Team Member]
1/29/2010 2:39:33 PM EST
For Power line noise they recommend an external dipole parallel to the power line as the noise antenna. Should be easy enough to construct from household extension cable and an RCA jack.
Originally Posted By HarryStone:
Thanks for letting me know how it worked out. I hope to buy one soon. I have bad power line noise here that's gone away almost completely since it's gotten cold. But I imagine I'll need it again come spring. A few hundred yards from my house it's so bad that it completely covers the AM broadcast band even now.

If you don't mind report back when you move your noise antenna. I'm hoping to be able to get by with using an indoor antenna too.


charliez  [Team Member]
2/16/2010 5:59:12 PM EST
40m was just crystal clear to me, with the ANC-4 no issues at all, noise is at s0.

Couple of different configuration were tried out this weekend:
- 80m in different configs short and long vertical, as well as counterpoises
- Extended noise antenna to 20' and placed outside

What I noticed was that at most times it could reduce noise to s0-s1 at the antenna's resonant frequency (i.e. without an antenna tuner in between).

With an antenna tuner, the noise cancelling seem to provide only 1 s bar than without. Radio -> ANC-4 -> ant. tuner > antenna

I ended up turning on my radio's AGC ON and Fast mode, and then adjusted the ANC-4 slowly until I got to around S4 or S5. The original noise was around s7-s8.

I could do some more bandpass/notching filters but ran out of weekend
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