[ICOM] Sherwood Engineering and DSP

[Mark Mumaw]

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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