[ICOM] Sherwood Engineering test numbers

[John Geiger]

Hi Tim,

Given that this is true, how can one tell whether
something has a good receiver or not, other than by
using it?  It seems that the numbers are very limited,
then.  And many of us can't afford to be the guinea
pig for new radios that come out.

73s John W5TD

--- Tim Duffy K3LR <k3lr at k3lr.com> wrote:

> 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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> 
> ----
> Your Moderator: Dick Flanagan K7VC,
> icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
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