1985 TV antenna lifter motor

[Don Bradner]

The micro switch should be for the "antenna is up" alarm. The slipping clutch is
the normal sound when reaching the stops; I would expect it if too much
resistance was being felt on the way up also.

Don Bradner
90 PT40 "Blue Thunder"
Posting today by satellite from Quartzsite, AZ

On 1/14/2008 at 12:46 AM mrkane1952 wrote:

>Greetings All:
>
>I wanted to watch the play-offs in HD via off-the-air digital
>broadcasts from the local stations, but the TV antenna lifter fails to
>raise the antenna on my 1985 PT40. The motor makes "slipping clutch"
>noises when run in either the "raise" or "lower" modes. After
>removing the extension assembly, it was possible to use the motor to
>raise the stubs to allow access to the (eighteen!!) cover screws, each
>of which required an impact driver to loosen.
>
>The lifter consists of a single assembly integrating motor and gear
>train. The only mark is a sticker "Warner Electric."
>
>There is a micro-switch positioned such that it probably was intended
>to open the circuit, stopping the motor when the antenna was
>completely retracted. However, the usual mode of operation during my
>ownership has been to raise or lower the antenna until slipping is
>heard. (This is a "tock-tock-tock" sound.)
>
>Anyone have any experience with R/R on this unit?