[Icom] 756 II Pro questions

Wed May 5 23:59:53 EDT 2004

Hi Mac,

It is possible that your antenna radiator is approaching a half-wave, or
multiple thereof, at the frequencies on which the SGC-230 will not match
down to VSWR < 1.5:1. You may be able to correct that by lengthening or
shortening the radiator.

Apart from the possibility of an "accident" when cascading two autotuners,
the additional insertion loss of the internal tuner is something it would be
nice to dispense with.

Cheers for now, 73,
Adam VA7OJ/AB4OJ

-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of D C Macdonald
Sent: Wednesday, May 05, 2004 10:13
To: [email protected]
Subject: RE: [Icom] 756 II Pro questions

I use an IC-746 feeding a "stealth" type antenna with an
SGC-230 autotuner.  At some frequencies, the SGC-230 can
not bring the VSWR down below a fold-back condition.  The
procedure I use is to set up the external SGC auto-tuner to
best match and then engage the internal IC-746 auto-tune.
It all works very well in this manner.

I agree that you should not try to get both auto-tuners to
search for match simultaneously.

73  ---  Mac, K2GKK/5

----Original Message Follows----
From: Adam Farson <[email protected]>
Reply-To: [email protected]
To: [email protected]
Subject: RE: [Icom] 756 II Pro questions
Date: Wed, 05 May 2004 09:46:56 -0700

Hi Mike,

Several friends of mine, and I, have had IC-756Pro II's in our stations for
2 to 3 years, without any problems whatsoever.

The IC-756Pro II Monitor is a sophisticated DSP-IF receiver. Here is a
description of it:

http://www.qsl.net/ab4oj/icom/ic756pro_notes.html#mon

I believe that the SWR foldback starts to reduce power at VSWR > 1.5:1. I
never experience this, as my ProII always drives a Yaesu Quadra amplifier
which has a flat input circuit. The Pro II autotuner will match loads up to
VSWR = 3:1 or slightly better; if load VSWR > 1.5:1, simply activate the
autotuner, but do not cascade it with an external tuner.

Neither my friends nor I have experienced any display problems with the Pro
II, or its predecessor, the IC-756Pro. Please check out my User Review:

http://www.qsl.net/ab4oj/icom/ic756pro_notes.html

Hope this will help you make a decision in favour of the Pro II. I feel that
it is without doubt the best HF transceiver I have ever owned.

Best 73,
Adam, VA7OJ/AB4OJ
North Vancouver, BC, Canada
http://www.qsl.net/ab4oj/
Icom FAQ site:
http://www.qsl.net/icom/

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