John
when things on the pro 3 don't work you can always g
a Pro 4
at least the Icom 7800 and the Orion are flash
upgradeable
--- John L Merrill <jmerrill1@adelphia.net> wrote:
> Hopefully I don't have tp reboot the ProIII :-).
>
> John N1JM
>
> -----Original Message-----
> From: tentec-bounces@contesting.com
> [mailto:tentec-bounces@contesting.com]On Behalf Of
> Bill Tippett
> Sent: Wednesday, January 26, 2005 7:10 PM
> To: tentec@contesting.com; orion@contesting.com
> Subject: [TenTec] Truth in Advertising...Icom Style
>
>
> March 2005 QST Product Review:
>
>
http://www.arrl.org/members-only/prodrev/pdf/pr0503.pdf
>
> ******************************************
> ICOM?s advertising for the PROIII
> trumpets what it calls ?+30 dBm-class
> third-order intercept point? performance
> on 20 meters. This would put it on a par
> with some of the best receivers we?ve ever
> run through the Lab. Third-order intercept
> (TOI) is a number that many like to
> use as an all-in-one performance benchmark,
> since its value derives both from
> the receiver?s sensitivity and its front-end
> selectivity (specifically, two-tone, third-
> order IMD dynamic range). The more
> positive the number, the better, and TOI
> figures can also be negative.
>
> Although the PROIII Instruction
> Manual doesn?t specify the advertised TOI
> number, an ICOM Product Guide, originally
> in Japanese, spells out the measurement
> conditions: 100 kHz spacing (wider
> than our Lab?s widest 20 kHz spacing measurement),
> preamps off and a 2.4 kHz filter
> bandwidth.
>
> Nonetheless, under the least stringent
> measurement standard the ARRL Lab
> uses, the PROII came pretty close to meeting
> the +30 dBm mark. At 20 kHz spacing,
> we calculated the TOI at +25 dBm
> on 14 MHz with both preamplifiers turned
> off. That works out to a slightly less than
> a 5 dBm improvement over the PROII, all
> other things being equal.
>
> Under the same conditions at 5 kHz
> spacing?something much more akin
> to real-world amateur conditions (and
> this time well within the passband of the
> receiver?s 15 kHz roofing filter)?we
> determined the PROIII?s TOI to be
> ?17 dBm, 1.8 dB better than the ?18.8 dBm
> we calculated for its predecessor."
> ***********************************************
>
> Whoopee...a whole 1.8 dB improvement
> at 5 kHz for another $800? And (er......
> ahem)...Orion's IP3 was measured by
> ARRL at 5 kHz to be +22.1 dBm, a mere
> 39.1 dB better (for just $300 more) but still
> below Icom's touted spec of +30 dBm. :-)
>
> At least ARRL is getting a little tougher
> than I've seen previously (last paragraph's
> "real-world" comment). Some day they
> may actually have the guts to call a spade
> a spade in their reviews. Naah...not likely
> as long as Icom keeps buying all those
> advertising pages in QST.
>
> 73, Bill W4ZV
>
> P.S. I finally broke the code...PRO stands
> for PRO-fessional B.S.
>
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