[ICOM] Sherwood Engineering and DSP

[David Ring]

An excellent posting Mark.  I agree with your view of this.  I do not
think pointing out a problem is negative, but is a positive.  "If they
knew about the problem, they would have fixed it."

How many times have I done my best, only later to find I left something out.

Fine posting Mark!

I think SDR is the way of the future - it allows engineers to do
things the old engineers could have only dreamed of.

73
DR

On 6/7/07, Mark Mumaw <nu6x at esedona.net> wrote:
> I first noticed this problem when I purchased my 9000D 2 years ago. I
> have some electric fences to my west that put out pulse every second.
> This pulse pumps the AGC and creates a serious problem. The 7800 handles
> it well when I use the NB at low levels.  On my early 9000D, the NB adds
> to much distortion to be of any use. (Yaesu may have a fix for this).
>
> If you are in a quiet location then this is probably not a problem. Most
> likely many hams are experiencing this problem to some degree but write
> it off to general noise on the band.
>
> Supposedly, Flexradio and Tentec have addressed this problem with a dual
> loop AGC, but both my SDR-1000 and Orion II still suffer from the
> problem, just not as bad. When I'm operating with the beam in the
> direction of this noise I generally switch to the 7800.
>
> It is very interesting that the AGC on the 756PRO II and other older
> rigs are NOT affected by this problem.
>
> I was at Rob's presentation at Dayton. Keep in mind that this was at a
> Drake Forum. I think what Rob is saying is that the manufactures really
> need to address this issue. I think there is little doubt that DSP
> and/or SDR radios are the wave of the future.
>
> 73 Mark NU6X  Sedona, AZ
>
>
>
> -----Original Message-----
> From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net]
> On Behalf Of Igor Sokolov
> Sent: Thursday, June 07, 2007 2:45 AM
> To: ICOM Reflector
> Subject: Re: [ICOM] Sherwood Engineering and DSP
>
> When recently A/B testing FT2000 against IC765 I have noticed exactly
> what
> Rob Sherwood describes in his presentation.
> I have got rid of FT2000 after that.
> 73, Igor UA9CDC
>
> > Hi John,
> >
> > Well, Rockwell-Collins, Harris, R&S, Thales (and their clientele)
> might
> beg
> > to differ.
> >
> > Cheers for now, 73,
> > Adam VA7OJ/AB4OJ
> >
> >
> > -----Original Message-----
> > From: icom-bounces at mailman.qth.net
> [mailto:icom-bounces at mailman.qth.net]
> On
> > Behalf Of John Geiger
> > Sent: Wednesday, June 06, 2007 18:38
> > To: icom at mailman.qth.net et al.
> >
> > Subject: [ICOM] Sherwood Engineering and DSP
> >
> > Sherwood Engineering just put up their Dayton 2007 presentation on DSP
> and
> > how it isn't everything it is cracked up to be.  See:
> >
> > http://www.sherweng.com/documents/Dayton2007w.pdf
> >
> >
> >
> >
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