[ICOM] ICOM AT180 dropping out - ideas anyone?

[Jim Miller]

Tapping the tune button will set the tuner to on and leave it there until I
start to transmit, then is when it starts to flash and then drops out.
During the flashing while I am transmitting all is good including the swr
indication on the radio.

If I press and hold, it goes through its tune cycle and drops out as if
there isn't any good place to stop.

Thanks es 73, de Jim KG0KP

----- Original Message ----- 
From: "KK2DOG in NY" <kk2dog at hotmail.com>
To: "Icom Reflector" <icom at mailman.qth.net>
Sent: Saturday, February 21, 2009 11:16 PM
Subject: Re: [ICOM] ICOM AT180 dropping out - ideas anyone?



Are you pressing the "Tune" button on the radio momentarily, or are you
holding it in for a second or two to start the tuning cycle? I hold mine in
until I hear the "beeeep' sound and then I release it.



                    Mike







> From: JimMiller at STL-OnLine.Net
> To: icom at mailman.qth.net
> Date: Sat, 21 Feb 2009 19:29:59 -0600
> Subject: [ICOM] ICOM AT180 dropping out - ideas anyone?
>
> (BTW - I don't have the SERVICE manual for the radio itself.)
>
> The tuner may be OK now.but I will need to get some more time on it to
see.
> Sometimes it was OK and then later it is not.
>
> What happens is that I use it to widen the band a bit in my mobile with
the
> 40 meter Hamstick. Turn the tuner on (706 button), it stays, transmit,
> (sometimes, most of the time) it starts flashing the tune light on the
> 706Mk2G and the swr shows about 1.2 or so and then after a few seconds it
> drops out and the swr is very high. If it would just STOP flashing and
stay
> engaged, all would be fine but it drops out. Press it on again and it goes
> back to flashing. They say that when it drops out that I "go away". I
> watch it and turn it right back on and they tell me I am back but they
> missed a few words or a sentence and "where did I go". (Holding the tune
> button to force tune doesn't find a good match and it disengages, it also
> doesn't change the symptoms.)
>
> The internal switches were set to default and I changed the AB switch from
> the A position to the B position (AB switch position B is called "Through
> Inhibit" and is described as:
>
> [the tuner tunes the antenna even when the antenna has poor SWR (up to
VSWR
> 3:1 after tuning). In this case manual tuning is necessary each time you
> change frequency although the tuner automatically starts tuning when the
> VSWR is higher than 3:1. This setting is called "Through Inhibit", however
> the tuner is set to "through" if the VSWR is higher than 3:1 after
tuning.]
>
> The CD switch was and still is in the D (default) position (CD switch not
> used for SSB operation).
>
> It seems to be MUCH better but I won't know until I get more time with it.
> Would anybody think there is a problem with the "bypass" RF path through
the
> tuner? Sounds to me like the next step if this thing still has problems.
> The antenna does work just fine within a much narrower range without the
> tuner in line.
>
> Thanks es 73, de Jim KG0KP
>
> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
> To support QSL/QTH: http://www.qsl.net/donate.html

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----
Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
Icom Users Net: Sundays, 1700Z, 14.316 MHz
Icom FAQ: http://www.qsl.net/icom/
To support QSL/QTH: http://www.qsl.net/donate.html