开云体育

-----Original Message-----
From: Peter [mailto:hb9pjt@...]
Sent: Wednesday, February 16, 2005 13:40
To: ic7000@...
Subject: [ic7000] Re: Price of the IC-7000




Adam, does the 756ProIII not have a more powerfull DSP than the
ProII?

--- In ic7000@..., Adam Farson <farson@s...> wrote:

Hi Buck,

Yes, the IC-7000 will use DSP filtering in the final IF. This is

the same

technology as used in the IC-756Pro series, the IC-746Pro/7400 and

the

IC-7800.



The ultimate performance of the DSP-IF subsystem - dynamic range,

noise

floor, filter shape factors, noise reduction etc. is a function

of the ADC

(analogue/digital converter) which is the interface between the

analogue

RF/IF chain and the DSP. The faster the DSP chip, the better the

filter

shape factors, NR etc. are likely to be. All the current Icom DSP-

based

radios use a 24-bit ADC and DAC and a 32-bit floating-point DSP.

The 756Pro

series uses the ADI SHARC, whilst the 746Pro and 7800 use faster

TI devices.

The ADC used in the 756Pro series has a slightly better noise

floor than

that of the 746Pro. The 7800 uses very high-quality ADC's which

are rather

costly.

The demands placed on the DAC (digital/analogue converter are

rather less

than those which the ADC has to meet, although the DAC plays an

important

role in setting the dynamic range of the transmitter. The ADC is

the key to

the receiver; if it degrades the incoming IF signal, all that

information is

lost forever and cannot be recovered.

There are a number of articles covering these topics (and others)

on my Icom

page.



Cheers for now, 73,
Adam VA7OJ/AB4OJ


-----Original Message-----
From: Buck (N4PGW) [mailto:na4fm-list@t...]
Sent: 16 February 2005 05:58
To: ic7000@...
Subject: [ic7000] Price of the IC-7000


Hello to all and thank you to the moderator of this reflector.

Ever since I have seen the IC-7000, I have been reading and

talking about

it. Like most of us here, I have considered it the new IC-706

radio but

after all I have read and seen, I have begun to think that 7000 is

to the

706 what the 756 pro is to the 746 pro.

What weighs most strongly is the fact that it will use electronic

filtering

rather than the crystal lattice filter. If I recall, isn't this

the same

filtering technology used in the IC-7800, the $10,000 radio?

From what I gather, the 706 is the most popular mobile HF radio on

the

market with sales greatly exceeding its runner-up. Right now it

sells for

about $800 US. I realize that the cost of technology drops over

time, and

with inflation, prices rise a bit, but at this point I am

wondering if the

rig might not be priced considerably higher than the 706. Around

here, a

few hams are thinking it will be in the $1500 US range.

What do you all think?

Buck
N4PGW




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