[Icom] IC-7800 intell.

Wed, 21 May 2003 00:41:47 -0400

The Orion seems to compare favorably with the projected specifications of
the IC-7800 especially considering the price.

ICOM is doing the DSP at twice the frequency than the IC-7800.
I can't wait until DSP is done at 455 kHz.

Ten-Tec's Orion has 100 db of spurious-free dynamic range.
ICOM lists the IC-7800 as 110 dB.

Ten-Tec sells crystal filters that will come before the DSP i.f. chain.  No
doubt a 250 Hz filter before the DSP would probably crank up the dynamic
range a bit.

Ten-Tec IP3: +25 dBm typical, 20-kHz spacing at BW=2.4 kHz, pre-amp off; +24
dBm typical, 5-kHz spacing, BW=500 Hz, pre-amp off.

Ten Tec IMD3 dynamic range: 101 dB typical, pre-amp off, 20-kHz and 5-kHz
spacing.
IP2: +75 dBm typical.

Ten Tec LO phase noise: -136 dBc/Hz typical from 0.5-20 kHz.Image rejection:
>70 dB.
IF rejection: >70 dB.  Other spurious response rejection: >90 dB, dF>1 MHz.

ICOM rates IC-7800 Spurious and image rejection ratio:  More than 70 dB.

Ten Tec frequency stability less than 1 ppm, but it seems that ICOM is going
to blow them away in this area.  But Ten-Tec has been selling commercial
radios, and a common rating for these services is 10 Hz or less.  Perhaps
this is something they only specified low.  1 ppm at 30 MHz is 30 Hz.  That
wouldn't do for commercial radio transmitters.  ICOM says +/- 0.05 ppm -- 
that's 20 times better than what Ten-Tec reports it has.  And ICOM says that
this is over the entire specified operating temperature range - outstanding.

However the real proof is in the receiving.

Many Collins and other "old" receivers were deliberately under specificied.
Ask the old "sparks" about some of the receivers that had identical "specs"
but one would receive signals and the other didn't.

I am sure that the ICOM will beat the Orion - but what is in the Ten-Tec
engineering drafting boards?

The ICOM IC-7800 is one prototype, no manufacturing line has been assembled.

But then again, is the IC-7800 rated conservatively?  Even though it seems
to be awsome, is it even better than they specify?  Possibly!

I think I'd hold off to see what happens.  It is going to be an interesting
horse race.

73

David Ring
N1EA

----- Original Message ----- 
From: "Matt Erickson" <[email protected]>
To: <[email protected]>
Sent: Tuesday, May 20, 2003 9:51 PM
Subject: Re: [Icom] IC-7800 intell.

> As far as the ICOM reps at Dayton were concerned, it is the IC-7800 now,
but if a US version carries a different number, they didn't know about that,
yet.
> Only time will tell us.
> If even half the things they told me about the receiver(s) (yes, I said
receivers), is true, this radio will dominate any and or all amateur radios,
and hold it's own against most commercial/mil radios anywhere.
>
> Orion? forget it! Not even in the same class, totally out of it's league
against the IC-7800...
>
> 73 de Matt KK5DR
> (darn tired of driving)
>
> At 08:35 PM 5/20/03 , you wrote:
> >Matt, I've read a couple of postings that claim that it will be termed
the
> >785 in the US and 7800 elsewhere. Any  word on that?
> >
> >73/72, George
> >Amateur Radio W5YR -  the Yellow Rose of Texas
> >Fairview, TX 30 mi NE of Dallas in Collin county EM13QE
> >"In the 57th year and it just keeps getting better!"
> ><mailto:[email protected]>
> >
> >
> >
> >
> >
> >----- Original Message -----
> >From: "Matt Erickson" <[email protected]>
> >To: <[email protected]>
> >Sent: Tuesday, May 20, 2003 7:49 PM
> >Subject: [Icom] IC-7800 intell.
> >
> >
> > > It's on the "Rumor Mill", updated. with a picture.
> > > Yes, it is REAL!!!
> > > Take a look; www.qsl.net/kk5dr/rumors.html
> > >
> > > 73 de Matt KK5DR
> > > ----
> > > Your Moderator: Dick Flanagan W6OLD, [email protected]
> > > Icom Users Net: Sundays, 1700Z, 14.315 MHz
> > > Icom FAQ: http://www.qsl.net/icom/
> >
> >----
> >Your Moderator: Dick Flanagan W6OLD, [email protected]
> >Icom Users Net: Sundays, 1700Z, 14.315 MHz
> >Icom FAQ: http://www.qsl.net/icom/
>
> ----
> Your Moderator: Dick Flanagan W6OLD, [email protected]
> Icom Users Net: Sundays, 1700Z, 14.315 MHz
> Icom FAQ: http://www.qsl.net/icom/
>