John notes that he had many noise sources, not just one. A phasing unit isn't
going to help him. That's a job for reduction at source, or DSP.
73,
Drew K3PA
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Today's Topics:
1. DSP units with great noise reduction (John Geiger)
2. Re: DSP units with great noise reduction (Martin, LU5DX)
----------------------------------------------------------------------
Message: 1
Date: Wed, 21 Oct 2020 16:50:09 -0500
From: John Geiger <af5cc2@gmail.com>
To: CQ Contest <cq-contest@contesting.com>
Subject: [CQ-Contest] DSP units with great noise reduction
Message-ID:
<CAHC1P28xhh8Se15JVQp1oyHjZpqT64_so1zdMj0pDTEs8Hm=fQ@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
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
------------------------------
Message: 2
Date: Thu, 22 Oct 2020 10:36:16 -0300
From: "Martin, LU5DX" <lu5dx@lucg.com.ar>
To: John Geiger <af5cc2@gmail.com>
Cc: CQ Contest <cq-contest@contesting.com>
Subject: Re: [CQ-Contest] DSP units with great noise reduction
Message-ID:
<CAFi2tqiRoMGPHJ1wbGHkRbGCy+tbL6xKuYdF8w3wzeVdPmaiNQ@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
Hello John,
In my case I use several things.
I have two noise cancelling units:
QRM Eliminator by SP8RSM
JPS ANC-4
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:
https://youtu.be/0KJai82eP2g
https://youtu.be/efyJRS3jbOI
Linrad
https://youtu.be/rWm38BW2-TI
I would really suggest you consider the DX Engineering NCC2
Vy 73,
Mart?n, LU5DX
El mi?., 21 oct. 2020 10:19 p. m., John Geiger <af5cc2@gmail.com> escribi?:
> 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@contesting.com
> http://lists.contesting.com/mailman/listinfo/cq-contest
>
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