[CQ-Contest] DSP units with great noise reduction

Martin, LU5DX lu5dx at lucg.com.ar
Thu Oct 22 09:36:16 EDT 2020

Hello John,

In my case I use several things.
I have two noise cancelling units:
QRM Eliminator by SP8RSM
These are no DSP but rather X-Phase type.
I owned a Timewave DSP599zx which worked okay in many aspects, like with no
specific EMI sources.

I sold it when I bought the FTDX3000D.
This rig is great. I have tested it during SSB and CW contests. On CW with
the optional 300Hz roofing filter it simply outperforms other rigs I have
used like, IC7851, K3S, IC7700, IC7600.
The noise reduction capabilities are pretty good.

I think you may have to experiment fighting the QRM based on what's present
at your location though.
Eventually you may want to explore with software using Linrad for example
as a last step in your noise-fighting artifacts chain.

Some videos on YouTube that may give you an overview:

QRM Eliminator:


I would really suggest you consider the DX Engineering NCC2

Vy 73,

Martín, LU5DX

El mié., 21 oct. 2020 10:19 p. m., John Geiger <af5cc2 at gmail.com> escribió:

>  I made a rather serious effort in the Illinois QSO party today since I
> used to live in IL and know a few of the operators in the contest, plus it
> is only an 8 hour effort-but I wish they would move it away from football
> season!  Conditions weren't the best, but I was really suffering from noise
> on 40 meters-not one specific noise source, just the crud you get from
> living in an urban neighborhood with lots of consumer electronics and their
> crummy switching power supplies and other noise makers.  I am sure I am not
> the only ham with this issue.  The noise reduction circuit in my current
> rig didn't do the greatest on handling this noise.
> One idea that came to me, that would be cheaper than a new rig (but less
> fun) would be an outboard DSP unit.  Does anyone have any recommendations
> on DSP units that have good noise reduction circuits?  I have seen some
> reviews on the Clearspeech and GAP speaker units that said that after you
> unkey after transmit you are hit with a burst of noise until the unit
> readapts itself to the receiver noise. I don't want something with that
> issue.
> Recommendations?  Also, what radios are really good at dealing with this
> type of noise.  I have seen the FTDX3000 and K3 mentioned as having great
> noise reduction circuits.
> 73 John AF5CC
> _______________________________________________
> CQ-Contest mailing list
> CQ-Contest at contesting.com
> http://lists.contesting.com/mailman/listinfo/cq-contest

More information about the CQ-Contest mailing list