[Icom] ICOM IC756 Pro II Problem

Sun, 28 Mar 2004 16:04:08 -0500

Hi Jim -
I had a similar problem with a brand new 756 ProII. On 6 meters, full output
indicated no matter what the mode. It wouldn't tune into a 6 meter beam
either, and for a bit I was blaming the antenna for part of the problem. I
never found out what the problem was, because HRO replaced the radio. Maybe
just Florida? No help I know, but you're not alone. Good luck.....
73, Mike NF4L
----- Original Message ----- 
From: "Jim Frederick" <[email protected]>
To: <[email protected]>
Sent: Sunday, March 28, 2004 3:34 PM
Subject: [Icom] ICOM IC756 Pro II Problem


> I have a problem with my 3-month old IC756 Pro II. It works fine up
through
> the 10M band in all respects. I tried to use it on 6 meters for the first
> time and here is what it does: When the transmitter is keyed, even on SSB
> with the power control and microphone gain both all the way down, it goes
to
> full power output on some frequency other than 6 meters, around 80 meters
I
> suspect. Obviously there should be no power output on SSB with no
microphone
> input. And it should not have full power output with the power control all
> the way down.
>
> Occasionally it will put out RF on 6 meters as long as the microphone gain
> is near zero. With extremely light microphone input I can hear a normal
SSB
> signal on a second 6-meter receiver in the room. But as the modulation is
> increased to anywhere near normal it "snaps" to full power output (power
> control is still full counterclockwise!) and the signal in the other
6-meter
> receiver disappears.
>
> My 6-meter antenna is flat, fed with ALL Andrew 1/4 Superflex hardline and
> 7/8 inch LDF hardline from the jack on the ICOM to the flex section at the
> rotor atop the tower. Problem also occurs when using a Bird dummy load.
> Occasionally it seems like it is going to work correctly when using the
> dummy load, but it will always "snap" to full power after a few seconds.
>
> ICOM in an email response to me says it probably is RF feedback. I don't
> think so, because there should be no RF at all in SSB with both the mic
gain
> and the power control all the way down.
>
> Anyone ever heard of this problem? Any ideas? Thanks in advance,
>
> Jim Frederick W4LF   [email protected]
>
>
>
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