[ICOM] QST Review of IC-7600

[Robert Chudek - K0RC]

Yeah, that second 'dit' looked a little slow on the uptake in the QST graph!

I am considering an upgrade from my Pro III to the 7600. There are a couple 
of features I want in a newer rig that are not found in the Pro. Separate 
audio (L & R) for the main and sub rx is one. I think this is still a 
combined audio stream with a fader control.

The second is the ability to "poke" the internal memory locations to enable 
the DVK from an external program. The Pro III does not have a CAT command 
(published at least) that allows this. Does the new 7600 address this area? 
This feature allows me (on a different radio) to store an audio CQ and use 
the radio DVK instead of a computer soundcard.

73 de Bob - KØRC in MN


----- Original Message ----- 
From: "Adam Farson" <farson at shaw.ca>
To: "'ICOM Reflector'" <icom at mailman.qth.net>
Sent: Wednesday, October 21, 2009 6:23 PM
Subject: Re: [ICOM] QST Review of IC-7600


> Hi Bob,
>
> To repeat my recent post on this subject:
>
> It is possible that the Drive Gain was incorrectly set during the ARRL 
> test
> suite, resulting in ALC overshoot and distortion of the leading edge of 
> the
> keying waveform.
>
> Quoting Peter Hart's RSGB review (RadCom, June 2009): "The CW fall times 
> are
> as set and appear fairly optimal. The rise time, however, is strongly
> dependent on ALC setting and at half ALC rise times are about three times 
> as
> long as the set value. This can cause some character shortening at high
> speeds."
>
> Regrettably, I did not check the CW waveform when I ran my test suite. (I
> intend including this test in my beta-test plan for the future.) The CW
> sidebands at 50 wpm looked pretty decent on the spectrum analyser.
>
> http://www.ab4oj.com/icom/ic7600/7600notes.pdf page 25
>
> The upshot of this is that the operator can adjust the ALC for optimum CW
> rise-time via the [DRIVE] control. So I would not dismiss the 7600 as a 
> "CW
> op's radio" out of hand. Peter Hart certainly did not.
>
> Cheers for now, 73,
> Adam VA7OJ/AB4OJ
>
>
> -----Original Message-----
> From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] 
> On
> Behalf Of Bob Beatty
> Sent: 21-Oct-09 13:37
> To: icom at mailman.qth.net
> Subject: [ICOM] QST Review of IC-7600
>
> In the review I saw no comment regarding the very slow rise time of the
> second dit in Figure 3. If this is representative of the rig's keying, it
> must sound terribly mushy.  The reviewer paid a lot of attention to other
> features but must not be a CW operator as this appears to be a glaring
> problem with the rig.
>
> 73,
>
> Bob W4VQ
> I do CW
>
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