[ICOM] ICOM AT180 dropping out - ideas anyone?

[KK2DOG in NY]

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
> 
> ----
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