[ICOM] Sherwood Engineering test numbers

[Tim Duffy K3LR]

Hi John:

That is why I said "lots of strong signals on the band".

I have worked with Rob Sherwood for over 30 years.
His tests are the best.

The way all of the receiver tests are performed, does not give you a
look into "real world" situations. Using two tones gives you a standard and
some guidance on which to compare, but you have to look further in to see the
real world story.

On the air means LOTS of strong signals. That is MUCH different than the lab.

73!
Tim K3LR

John Geiger wrote:

> Hi Tim,
>
> Yes, I have heard others say that also.  But that
> still doesn't get down to my original question-how did
> it score so well on the IMD DR Sherwood test??  Better
> than many radios considered contest radios.
>
> 73s John W5TD
>
> --- Tim Duffy K3LR <k3lr at k3lr.com> wrote:
>
> > John:
> >
> > My 706 is a much better radio when using antennas
> > that are somewhat inefficient
> > such as mobile and portable antennas.
> > If I hook my 706 up to a beam or a full-size dipole,
> > the attenuators do a
> > wonderful job of protecting the front end and making
> > the radio usable.
> >
> > Remember that the IC706 series receiver was never
> > intended to compete along side
> > radios that cost far more and perform much better
> > with lots of strong signals on
> > the band.
> >
> > 73!
> > Tim K3LR
> >
> > John Luthy wrote:
> >
> > > John,
> > >
> > > First I am NOT any kind of expert,
> > >
> > > But I have noticed that my 706MkIIg is almost hard
> > to listen to,
> > > mostly because it hears everything, so I wonder if
> > it is fed a small
> > > signal in a lab it might look like a very good
> > reciver,
> > > So I wonder if I would be happier with my 706  if
> > I had a differnt
> > > filters in it.
> > >
> > > ----- Original Message -----
> > > From: "John Geiger" <johngeig at yahoo.com>
> > > To: <cq-contest at contesting.com>;
> > <yaesu at mailman.qth.net>;
> > > <icom at mailman.qth.net>; <yaesu at contesting.com>;
> > > <dx-list at yahoogroups.com>
> > > Sent: Sunday, October 15, 2006 1:58 PM
> > > Subject: [ICOM] Sherwood Engineering test numbers
> > >
> > > > How much stock does everyone place in the
> > Sherwood
> > > > Engineering receiver test numbers
> > (www.sherweng.com)?
> > > > While I admit that the 2khz spacing is a much
> > more
> > > > useful measurement than the 20khz the ARRL has
> > used
> > > > for a long time, and I believe that Rob Sherwood
> > knows
> > > > what he is talking about when he tests
> > receivers, I
> > > > have a hard time believing some of his numbers.
> > > >
> > > > For example, he measures the 2khz IMD DR for the
> > Icom
> > > > 706MKIIG at 74db. This places it right in line
> > with
> > > > the PROII and PROIII at 75db, and better than
> > the
> > > > 756PRO (71db), FT1000D (69db), FT1000mp MK V
> > (69db),
> > > > and the Icom 746 (70db).  Now I have owned many
> > of
> > > > these radios, and I did not find the 706MKIIG to
> > have
> > > > that good of a receiver, definitely not better
> > than
> > > > the 756PRO or the Yaesu FT1000 series.  It
> > overloaded
> > > > pretty bad under contest conditions.  What am I
> > > > missing in his measurements, that makes the
> > 706MKIIG
> > > > look so much better than these other radios?
> > > >
> > > > 73s John W5TD
> > > >
> > > >
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