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Re: Antenna
Posted by David Prantl - http://saabnet.com/tsn/forms/e.php3 (more from David Prantl - http://saabnet.com/tsn/forms/e.php3) on Mon, 28 Apr 2003 16:53:56
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

>>  When my antenna reaches full extension, the motor  knocks 2 times,

>  I believe it's the antenna segments knocking together  at full extension,

Not really.  There's a clutch mechanism that slips when the resistance to 
mast movement gets too high.  The slipping is in discrete steps, and each 
step sounds like a knocking sound.  It's perfectly normal to hear between 1 
and 3 slip steps after full extension, and after full retraction.  This 
means the motor is being run for the correct length of time to get the job 
done.

To understand this better, you can make the antenna try to retract while 
firmly holding it in it's fully extended position.  You'll probably hear up 
to 10 knocks before the motor turns off.  Same if you firmly hold the top of 
the mast down (fully retracted) while your helper turns on the radio...

>  not the belt inside the segments starting to strip.

This isn't really a possibility.  The top segment of the antenna has a 
flexible toothed plastic tail attached to it.  The tail meshes with some 
gears inside the drive unit, and gets wound onto a plastic drum when the 
mast is retracted.  The most common failure mode (besides snapping the mast 
off while extended in an automatic car) is embrittlement and breakage of the 
toothed tail.

David Prantl
david_prantlno39sdcx6spamx782hotmail.com
'84 900S, 5M, 210kMi, RIP as of 2/98
'89 900, 3A, 116kMi, restored and SOLD on 3/24/01
'97 9000CSET, 5M, 63kMi, Speedparts Stage-I, SOLD on 10/11/02
'86 9000T, 5M, 200kMi
'88 9000S, 5M, 142kMi
'90 9000S (B202I), 4A, 146kMi
'93 9000CSET, 5M, 82kMi
'68 97 Sonett V4, 4M, 76kMi, #000467
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