Hi Bob --
The alignment pots on this unit are at their stops. This is one
reason that leads us to suspect an internal electronics issue.
-- Eric
on 07 Jan 30 Tue 11:58 Robert Chudek - K0RC said the following:
> Eric,
>
> I have 3 of the G-1000DXA rotors. A year and a half ago I had all three of
> them on the kitchen table. I spent the better part of a day going through the
> alignment to get them accurate. One of them was perfect, the other two ended
> up "close enough" that the trade off between accuracy and time was not worth
> the extra effort.
>
> There are two alignment pots on the back of the control head. They interact
> significantly during calibration. I connected the actual rotor cable I was
> going to install to eliminate any issue with changes in resistance for the
> metering.
>
> The biggest time sink was waiting for the rotor to turn the full 450 degrees,
> make an adjustment, and repeat as needed. I put a short stick (a "pointer")
> in the rotor head to help visualize where the unit was pointing. Also, I
> wasted time trying to get the red "overlap" LED to synchronize to the 360
> degree position. I later discovered this is a mechanical setting inside the
> control head.
>
> The two "trouble" units were difficult to get the synchronization between the
> rotor and controller in the last 15 ~ 30 degrees of rotation. Your trouble is
> much more severe with it going off track in less than 180 degrees.
>
> Make sure the control pots are not "noisy" or you'll never get them set
> right. It would be nice if these pots were 10-turn precision units because my
> calibration time would have been measured in minutes instead of hours.
>
> In hindsight, I could have saved a lot of time by opening the rotors and
> rotating the direction pot by hand.
>
> 73 de Bob - KÃRC in MN
>
> ------------------------------
>
> Message: 7
> Date: Tue, 30 Jan 2007 00:10:02 -0500
> From: Eric Scace K3NA <eric@k3na.org>
> Subject: [TowerTalk] Yaesu G-1000DXA control box: pointer error
> To: Towertalk <towertalk@contesting.com>
> Message-ID: <45BED32A.4070901@k3na.org>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> Hi folks --
>
> At W1KM the 10m stack is rotated by a Yaesu G-1000DXA. The stack is
> side-mounted so we only get about 300? of azimuth coverage.
>
> The control box does not track direction very well. At the full CCW
> limit (330?), we can set the pointer for the correct direction. The
> display reads out correctly from NW through E. Thereafter the indicator
> moves smaller and smaller distances ... so that, by the time the antenna
> is pointing SW, the display indicator is 45? behind (i.e., pointing S).
>
> Recently this problem became worse. The indicator no longer tracks
> even in the previously-correct NW-through-E sector.
>
> We suspect something has gone wrong in the electronics within in the
> control box... but wonder if anyone else has had -- and fixed -- this
> problem.
>
> Thanks.
>
> -- Eric K3NA
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