[TowerTalk] Re: Yaesu G-1000SDX Rotator

[Tom Hammond]

Natan:

Thanks for the hint.  Will check that out... I know that it
certainly WAS centered when things started...!  In fact, it
turned at the same speeds for the first couple years.

How much eccentricity IS acceptable?  1/16" or less? More?

On thing I forgot to mention about my testing...

  While taking voltage readings, I found that the voltage
  taken at the output leads to the motor winding (e.g. right
  at the back of the control) both measure 20.x VDC (in BOTH
  directions) if the plug is NOT inserted into the socket... 
  but the CW voltage drops nearly 8V when a load is placed
  on the control bax, even though there is no discernible
  increase in load current... in fact, it seems to drop a bit.
  
Will continue to work thru this.  Thanks for yout reply.

73 - Tom Hammond   N0SS

At 17:10 04/10/1999 -0400, you wrote:
>Tom,
>
>First thing I would do is to accurately determine if the rotor is perfectly
>centered under the mast.  Went through what you are describing 5 years ago,
>voltage readings and all, and the problem was solved by moving the rotor.
>
>73
>
>Natan  W6XR/2
>-----Original Message-----
>From: Tom Hammond <n0ss@socket.net>
>To: towertalk@contesting.com <towertalk@contesting.com>
>Date: Saturday, April 10, 1999 4:13 PM
>Subject: [TowerTalk] Re: Yaesu G-1000SDX Rotator
>
>
>>
>>Hi guys:
>>
>>I just joined this reflector, so I hope this subject is
>>appropriate for posting here. If it is, then fine.  If
>>it is NOT, then please send any replies DIRECTLY to me,
>>rather than posting them on the reflector. Thanks.
>>
>>I've had a Yaesu G-1000SDX turning the TH-6DXX (only) on
>>my tower, U.S. Tower 72' Crank-up, thru the U.S. Tower-
>>supplied thrust bearing.
>>
>>Recently, I've been noticing that the rotator turns the
>>antenna significantly faster when it's turning in a
>>COUNTERCLOCKWISE direction than when it's going in the
>>opposite direction. The rotational times (in secs.) are:
>>
>>        Speed Pot Setting
>>          SLOW     FAST
>>   CCW     99       48   seconds
>>    CW     99       75   seconds <= !!!
>>
>>Initially, I thought I probably had something binding
>>on the tower.  To check that possibility WITHOUT having
>>to climb the tower, I took several voltage and current
>>readings inside the control box:
>>
>>  Voltage (DC) across the motor winding (Pins 4 & 5 of
>>  the Jones plug at the back of the control box)
>>
>>        Speed Pot Setting
>>          SLOW     FAST
>>   CCW    11.7     20.3
>>    CW    11.6     12.9 <= !!!!
>>
>>Checking further into the problem, I found that the
>>current drawn by the motor on the FAST setting (400 mA.
>>avg.) does not change significantly bewteen CCW and CW
>>rotation, so I think that binding is not the problem.
>>
>>Does anyone have a suggestion?  The rotator turns OK
>>in both directions, it just does so SLOWLY in the CW
>>direction, even when set to FAST.
>>
>>Thanks for your time.
>>
>>73 - Tom Hammond   N0SS
>>
>>--
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>>
>
>

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